# Physics Final Review

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### An object in equilibrium is an object

Moving with constant velocity.

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.

Inertia.

20 km/h

Zero.

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

Acceleration increases.

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.

6 km/h/s

4 m/s.

60 m/s.

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.

The gravitational attraction force between you and the Earth.

Inertia.

The same.

Force.

### A force is a vector quantity because it has both

Magnitude and direction.

5 N.

10 N.

Is zero.

3

10 N.

10

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

Size and mass of the object.

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.

Zero

Is zero.

None of these.

1000 N.

500 N.

Both the same

None of these

1st law.

### 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.

None of these

Long time.

The same

48 m/s.

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.

Power.

2 W.

The same.

Moving.

The same.

40 J.

The top.

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.

40 J.

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

True.

10%

5000 J.

Outside horse.

The coin.

Bent.

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

1/3 the distance from the fulcrum.

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.

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.

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.

Increase.

Earth.

100 N.

The force on A.

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.

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

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.

Atmosphere.

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.

### 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.

Longer.

unchanged.

### If a loaf of bread is compressed, its

density decreases.

Double.

more

Compression.

Tension.

more.

Less.

Compression

Thickness.

Is less.

### Which potatoes when peeled produce the most peelings?

10 kg of small potatoes.

Elephant

A mouse

### Doubling the linear size of an object multiplies its area by

4 and its volume by 8

4

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

8

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.

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.

Both of these

The same.

10 tons

100 tons

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.

Less.

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.

### Buoyant force is greatest on a submerged

The same as both.

### 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

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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