Physics Final Review

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An object in equilibrium is an object

Moving with constant velocity.

When you stand at rest on a pair of bathroom scales, the readings on the scales will always

Add up to equal your weight.

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant

10 N.

A truck is moving at a constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor

Exactly below the midpoint of the ceiling.

If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is

Inertia.

A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is

20 km/h

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is

Zero.

While an object near the Earth's surface is in free fall, its

Acceleration increases.

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

Zero.

Twelve seconds after starting from rest, an object falling freely will have a speed of

More than 100 m/s.

If an object moves with constant acceleration, its velocity must

Change by the same amount each second.

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is

6 km/h/s

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?

About 60 m.

If a car accelerates from rest at 2 meters per second, its speed 3 seconds later will be about

4 m/s.

At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about

60 m/s.

Disregarding air resistance, objects fall with constant

Acceleration

If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about

1 second.

Your weight is

The gravitational attraction force between you and the Earth.

If one object has twice as much mass as another object, it also has twice as much

Inertia.

Compared to the mass of a certain object on Earth, the mass of the same object on the moon is

The same.

The newton is a unit of

Force.

A force is a vector quantity because it has both

Magnitude and direction.

An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The magnitude of the resultant force on the object is

5 N.

The force of friction on a sliding object is 10 Newtons. The applied force needed to maintain a constant velocity is

10 N.

Whenever the net force on an object is zero, its acceleration

Is zero.

A girl pills on a 10-kg wagon with a constant horizontal force of 30 N. If there are no other horizontal forces, what is the wagon's acceleration in meters per second per second?

3

A bag of groceries has a mass of 10 kilograms and a weight of

10 N.

A 10 kilogram block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block in meters per second per second is?

10

Two factors that greatly affect air resistance on falling objects are the

Size and mass of the object.

When a falling object has reached its terminal velocity, its acceleration is

Constant.

Two objects of the same size but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the

Both hit at the same time.

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increase, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second per second is?

Zero

A skydiver steps from a helicopter and falls for a few seconds until he reaches his terminal velocity. Thereafter, until he opens his parachute, his acceleration

Is zero.

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. The reaction to this force is the

None of these.

A baseball player bats a ball with a force of 1000 N. The reaction force that the ball exerts against the bat is

1000 N.

A person is attracted toward the center of Earth by a 500 N gravitational force. The Earth is attracted toward the person with a force of

500 N.

Arnold Strongman and Suzie Small each pull very hard on opposite ends of a massless rope in a tug-of-war. The greater force on the rope is exerted by

Both the same

A skydiver falls towards the Earth. The attraction of the Earth on the diver pulls the diver down. What is the reaction to this form?

None of these

A bird sitting on the limb of a tree is moving about 30 km/s with respect to the Sun. If the bird takes 1 second to drop down to a worm below, the worm would be 30 km downrange from the bird when it reached the ground. This faulty reasoning is best countered with Newton's

1st law.

The force exerted on the tires of a car to directly accelerate it along a road is exerted by the

Road.

Which of the following has the largest momentum relative to the Earth's surface?

A pick up truck speeding across the highway.

It is correct to say that impulse is equal to

The change in momentum it produces.

A rifle recoils while firing a bullet. The speed of the rifle's recoil is small because the

Rifle has much more mass than the bullet.

Two objects have the same size ad shape, but one is much heavier than the other. When they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater

None of these

When you are in the way of a fast-moving object and cant get out of its way, you will suffer a smaller force of impact if you decrease its momentum over a

Long time.

A large metal ball is shot from a cannon with a short ball were to be shot from cannon with a longer barrel, its muzzle velocity would be

The same

A 4 kg ball has a momentum of 12 kg m/s. What is the balls speed?

48 m/s.

A 1000 kg car moving at 10 m/s brakes to a stop in 5s. The average braking force is

5000 N.

If you push for a half hour of a whole hour against a stationary wall

No work on the wall is done in either case.

If you push an object twice as far while applying the same force, you do

Twice as much as work.

A job is done slowly, while an identical job is done quickly. Both jobs require the same amount of work, but different amounts of

Power.

Do 100 J of work in 50 s and your power output is

2 W.

An object lifted 10 meters gains 200 J of potential energy. If the same object is lifted 20 meters, its potential energy gain is

The same.

An object that has kinetic energy must be

Moving.

A clerk can lift containers a vertical distance of 1 meter or can roll them up a 2 meter long ramp to the same elevation. With the ramp, the applied force required is about

The same.

A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy that is

40 J.

The ball rolling down an incline has its maximum potential energy at

The top.

A ball rolling down an incline has its maximum kinetic energy at

The bottom.

What task requires the most work; lifting a 50 kg sack 2 meters of lifting a 25 kg sack of 4 meters?

Both require the same amount of work.

A TV ser is pushed a distance of 2 m with a force of 20 N. How much work is done on the set?

40 J.

A 2 kg mass is held 4 m above the ground. What is the approximate potential energy of the mass with respect to the ground?

80 J.

A car moves 4 times as fast as another identical. Compared to the slower car, the faster car has

16 times the kinetic energy

Strictly speaking more fuel is consumed by your car if an air conditioner, headlights, or even a radio is turned on. This statement is

True.

A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the machine is

10%

A diver who weighs 500 N steps off a diving board that is 10 m above the water. The diver hits the water with kinetic energy of

5000 J.

Which moves faster in m/s on a merry go round: a horse on the inside or a horse on the outside near the outer rail?

Outside horse.

A broom is easier to balance upright when heavier end (the brush end) is

Nearest your hand.

A coin and a ring roll down an incline starting at the same time. The one to reach the bottom first will be

The coin.

The rotational inertia of your leg is greater when your leg is

Bent.

On a balanced see-saw, a boy three times as heavy as his partner sits

1/3 the distance from the fulcrum.

Put a pipe over the end of a wrench when trying to turn a stubborn nut on a bolt, to effectively make the wrench handle twice as long, you'll multiply the torque by

Two.

The long, heavy, tail of a monkey enables the monkey to easily vary its

Center of gravity.

The center of mass of a human body is located at a point

That changes as a person bends over.

The famous Leaning Tower of Pisa doesnt topple over because its center of gravity is

In the same place of its center of mass.

When a twirling ice skater brings her arms inward, her rotational speed

Remains the same.

Two people are balanced on a seesaw, If one person leans forward the center of the seesaw, that person's end of the seesaw will

Rise and then fall.

A car travels in a circle with constant speed. The net force on the car is

Directed toward the center of the curve.

If you balance a broom horizontally on one finger, the center of gravity of the broom will be above your finger-closer to the bristles end than the handle end. If you saw the broom in two pieces at that point and weigh the two parts on a scale, you'll find that the heavier part is the

Bristles part

According to Newton, the greater the masses of interacting objects, the

Greater the gravitational force between them.

According to Newton, doubling the distance between two interacting objects

Divides by 4 the gravitational force between them.

If the mass of the Earth somehow increased with no charge in radius, your weight would

Increase also.

Inside a freely falling elevator, there would be no

Apparent weight for you.

An asteroid exerts a 360 N gravitational force on a nearby spacecraft. This force is directed

Toward the asteroid.

If your mass, the mass of the Earth, and the mass of everything in the solar system were twice as mush as it is now, yet everything stayed the same size, your weight on Earth would

Quadruple.

If the radius of the Earth somehow decreased with no change in mass, your weight would

Increase.

An object is placed exactly halfway between the Earth and Moon. The object will fall toward the

Earth.

A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there?

100 N.

A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?

The force on A.

Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them

Remain constant.

Passengers in a high-flying jumbo jet feel their normal weight in flight, while passengers in the orbiting space shuttle do not. This is because passengers in the space shuttle are

Without support forces.

How far must one travel to get away from the Earth's gravitational field?

Forget it; you cant travel for enough.

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its vertical component of velocity

Decreases.

A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its horizontal component of velocity

Remains unchanged

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance below the top of the cliff is

5 m.

Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity

Remains constant.

A bullet fired horizontally from a rifle begins to fall

As soon as it leaves the barrel.

An Earth satellite is simply a projectile

Freely falling around the Earth.

Earth satellites are typically more than 100 km high so as to be above the Earth's

Atmosphere.

A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is a the same level at which the projectile started. It will also land on the target if it is fired at one angle of

40 degrees.

What prevents satellites such as the space shuttle from falling?

Nothing, they are continually falling as they orbit the Earth.

The circular path of a satellite is an elliptical orbit. The satellite travels fastest when it is

Nearest the Earth.

A satellite near the Earth makes a full circle in about an hour and a half. How long would a satellite located as far away as the moon take to orbit the Earth?

About 28 days.

Communications and weather satellites always appear at the same place in the sky. This is because these satellites are

Orbiting the Earth with a 24-hour period.

Compared to the period of satellites in orbit close to the Earth, the period of satellites in orbit far from the Earth is

Longer.

When a chocolate bar is cut in half, its density is

unchanged.

If a loaf of bread is compressed, its

density decreases.

If the mass of an object were to double while its volume remains the same, its density would

Double.

Compared to the density of a kilogram of feathers, the density would

more

When weight is applied to the top of a stone arch, all of the stone blocks in the arch undergo

Compression.

When a load is placed in the middle of a horizontal beam supported at each end, the bottom part of the beam undergoes

Tension.

You wish to bolt a sign to a horizontal 1-beam supporting a bridge. You will weaken the beam least if you drill the bolt-holes through the

more.

Compressed to the volume of a kilogram of feathers, the volume of a kilogram of lead is

Less.

Stone slabs are stronger under

Compression

The strength of a rope depends on its

Thickness.

An iron block is placed in a furnace where is heated and consequently expands. In the expanded condition, its density

Is less.

Which potatoes when peeled produce the most peelings?

10 kg of small potatoes.

Which has more skin, and elephant or mouse?

Elephant

Which has more skin compared to its body weight, an elephant or a mouse?

A mouse

Doubling the linear size of an object multiplies its area by

4 and its volume by 8

When a living cell doubles in diameter, the amount of its material to be nourished is multiplied by eight, but the amount of membrane through which to feed it is multiplied by

4

Which cooks faster in boiling oil?

A sliced potato.

A dome-shaped house is more heat efficient than a rectangular house because the dome has

Less area compared to its volume

If an elephant grew to twice its height, the area of its ears would be about

Four times what it was

If an elephant grows to twice its normal height, its weight will be multiplied by about

8

In cold weather, your hands will be warmer if you wear

Mittens

In cooking a turkey in a conventional oven at a given temperature, compared to a medium sized turkey, a large turkey takes

More time per pound to cook.

If each dimension of a steel bridge is scaled up ten times, its strength will be multiplied by about

Ten, and its weight by ten also.

The pressure in a liquid depends on liquid

Density

Pumice is a volcanic rock that floats. Its density is

Less than the density of the water.

The reason that buoyant forces act upward on a submerged object is that

Upward pressure against the bottom is greater than downward pressure against the top of the submerged object.

A fish normally displaces its own

Both of these

Compared to the density of water, the density of a fish is

The same.

What is the buoyant force acting on a 10 ton ship floating in the ocean?

10 tons

What is the weight of water displaced by a 100 ton floating ship?

100 tons

Blood pressure is normally greater in your

Feet

When holes are drilled through the wall of a water tower, water will spurt out the greatest horizontal distance from the hole closest to the

Bottom of the tower.

Lobsters live on the bottom of the ocean. The density of a lobster is

Greater than the density of sea water.

A lobster crawls onto a bathroom scale submerged at the bottom of the ocean. Compared to its weight above the surface, the lobster will have an apparent weight under water that is

Less.

A rock suspended by a string weighs 5 N out of water and 3 N when submerged. What is the buoyant force on the rock?

2 N.

An egg is placed at the bottom of a bowl filled with water. Salt is slowly added to the water until the egg rises and floats. From this experiment, one concludes

The density of salt water exceeds the density of the egg.

A block of Styrofoam floats on water while a same size block of lead lies submerged in the water. The buoyant force is greatest on the

Lead.

Buoyant force is greater on a submerged

1 kg block of lead.

Buoyant force is greatest on a submerged

The same as both.

When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the high-density water of the Dead Sea, the buoyant force that acts on you is

Equal to your weight.

When a boat sails from fresh water to salt water, the boat will float

Higher in the water

There is a legend of a Dutch boy who bravely held back the Atlantic Ocean by plugging a leak near the top of a dike with finger until help arrived. Which of the following is most likely?

The force on his finger would have been small enough for this to occur

The energy source responsible for the motion of molecules that make up the atmosphere is

Solar power

Atmospheric molecules do not fly off into outer space because

Earth gravitation

Atmospheric pressure is caused by the

Weight of the atmosphere

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