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PHYSC FINAL (Exam 1, 2, 3)
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Gravity
Terms in this set (112)
A girl pushes a cart to the left with a 100-N force. At the same time a boy with pushes it to the left with 50-N force. The force exerted on the cart is __________?
50-N to the left
A glance at the speedometer on your vehicle will tell you your ___________
instantaneous speed
You do work on a cart loaded with groceries. If you do the work in 1/3 the usual time, you expend______________
three times the usual power
The force required to maintain an object at a constant velocity in free space is equal to____________
zero
A player hits a ball with a bat. If one interaction is the ball against the bat, the other part is _________________
the ball against the bat
Two billiard balls having the same mass and speed roll toward each other. What is their combined momentum after they meet?
0kg*M/S
Which has zero acceleration?
-an object moving at a constant velocity
-an object in mechanical equilibrium
-an object at rest
Galileo's demonstration at the Leaning Tower of Pisa
refuted Aristotle's teachings
According to Galileo, the test of scientific truth is _____________
experiment
Consider a gun with a pellet that is more massive than the gun. The firing speed is greater for the ______________
recoiling gun
The average speed of Daisy running a distance of 2km in a time of one half hour is ___________
4 km/h
A parachutist falling at a constant velocity is in a state of
dynamic equilibrium
Match the right unit to the right physical quantity
acceleration
distance
work
impulse
-meter per second squared
-meter
-Newton*meter
Newton*second
A car will decelerate when its velocity and acceleration are in opposite direction
True
Newton's Second Law focuses on _____________
acceleration
Whereas impulse involves the time that a force acts, work involves the
distance that a force acts
If you carry a heavy bag of groceries and bang your hand against the wall, the concept that best explains why your hand hurts is _____________
inertia
A kilogram is the measure of an objects
mass
On the surface of the Earth, a hammer drops faster than a feather because the existence of air resistance.
True
A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. When they collide and stick, the combined glider speed is
1/3 m/s
Relate the right physical quantities with the change
The change of momentum is caused by
The change of motion is caused by
The change of kinetic-energy equals to
-Net Impulse
-Net Force
-Net Work
A block of ice sliding down an incline has one-quarter its maximum potential energy ____________
one quarter from the bottom
Chose the right law for each situation
-When the car suddenly stops, your seatbelt pulls you to slow down
-When you jump from a cliff with a certain height, the Earth is pulling you down, and you are pulling up the Earth
-When your car has a broken break, you choose to run into a haystack rather than a brick wall because a longer impact time results in a smaller impact force
-Newton's Second Law
-Newton's Third Law
-Impulse-Momentum Theory
Lift an object against the force of gravity if you want to judge its
weight
A Mack Truck and a Mini-Cooper traveling at the same speed collide head-on. The collision force is greatest on the _____________
its the same on both
An object may have potential energy because of its
location
At the end of 2 seconds, a freely falling apple from rest has a speed of _________
more than 10 m/s
Friction force only exists on a moving object
false
When a rocket ship gaining speed in remote, gravity-free outer space runs out of fuel, it ____________
no longer gains speed
A 3000-N bear grasping a vertical tree slides down at a constant velocity. The friction force between the tree and the bear is _____________
3000-N
When Jean hikes a distance of 1 km in a time of one half-hour her average speed is ________
2 km/h
The force of a falling apple depends upon ___________
all of the above
When Danny Diver who weighs 500 N steps off a diving board 10 m above the water, he hits the water with kinetic energy of __________
5000-J
Earth pulls on the Moon. Similarly, the Moon pulls on Earth, evidence that ______________
-Earth and Moon pull on each other
-Earth's and Moon's pull comprises an action-reaction pair
When you throw a ball upward, its acceleration will decrease to zero at its maximum height
False
A parachutist steps from a hovering helicopter and falls for 5 seconds before reaching terminal velocity. During this 5-s interval, her acceleration _____________
decreases
For a circular motion with constant speed, it does not have an acceleration.
False
During each second of free fall, the speed of an object _____________
increases by the same amount
A 10-N block and a 1-N block lie on a horizontal, frictionless table. To push them with equal acceleration, we would have to push them with ___________
10 times as much force on the heavier block
Marie pushes horizontally on her desk, but not hard enough to get it moving. The friction force acting on the desk is
equal and opposite to her push
Jogging Jake runs along the top of a moving flatcar in the direction of motion of the flatcar. If he runs in the opposite direction, the combined momentum of Jake and the flatcar relative to an observer at rest will be __________
less
It is correct to say that impulse is equal to
change in momentum
It takes 40 J to push a large box 4 m across a floor. The force exerted on the crate is __________
10-N
A 10-N falling object experiences 10-N of air resistance. The net force on it is ___________
0 N
An 800-N man stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is
400-N
When you simultaneously drop a light tennis ball and a heavy bowling ball, they hit the floor
at the same speed
When Lillian hangs from a pair of gym rings, the upward support forces by the rings will always
add up to equal her weight
An object that has kinetic energy must be
moving
Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a wall, the wall doesn't slam into you at 30 km/s because the wall
and you move at the same horizontal speed before, during, and after your jump
Compared with falling on a wooden floor, a wine glass may not break when it falls on carpeted floor because___________
-longer time to stop
-lesser impulse in stopping
An iron ball and wooden ball of the same size are dropped simultaneously from a tower and reach the ground at the same time. The iron ball has a greater
momentum
What is the mass of a ball moving at 3 m/s with a momentum of 48 kg*m/s ?
16 kg
A light woman and a heavy man jump from an airplane at the same time and open their same-size parachutes at the same time. Which person reaches a state of zero acceleration first?
the light woman
A block of Styrofoam floats on water while a same size lead block lies submerged in the water. The buoyant force is greatest on the ______________
lead
The concept of pressure involves both
force and area
A dropped ball gains speed because ___________
a gravitational force acts on it
Neglecting air resistance, after a ball leaves your hand when you toss it at 10 degrees above horizontal, the force on it at the maximum height is ___________________
gravity force downward
If we triple the mass of an object without a change in volume, its density would be _____________
triple
Consider two planets in space that gravitationally attract each other. If the masses of both planets are decreased to half, and the distance between them doesn't change, then the force between them is _____________
one-quarter
Match the laws with the right statement
-Every mass attracts every other mass in the universe
-The basic principle for hydraulic machine
-Every floating object displaces equal weight of liquid as its own weight
-Buoyancy in fluids equals to the weight of displaced fluids (both gases and liquids)
-The intensity of gravitational force decreases with distance by
-A totally submerged object displaces equal volume of liquid as its own volume
-law of universal gravitational force
-Pascal's Principle
-Principle of Floatation
-Archemides Principle
-Inverse Square Law
-Archemides Volume Rule
As a high-altitude balloon sinks lower into the atmosphere, it undergoes a decrease in
volume
A bullet fired horizontally hits the ground in 2s. If it had been fired with half the velocity, it would have hit the ground in ____________
2 s
Evacuated Magdeburg hemispheres are each
pushed together by the atmosphere
Phil stands at rest with both feet on a scale that reads 500-N. After he gently lifts one foot, the scale reads
500-N
Compared to the speed a satellite loses when traveling from nearest to farthest points from Earth, the speed gained when returning from farthest to nearest is
the same
A "weightless" astronaut in an orbiting space vehicle is
without a support force
Nellie tosses a ball upward at an angle. Assuming no air resistance, which component of velocity changes with time?
the vertical component
A hunter aims a rifle at an angle of 30 degrees below the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. The bullet to hit the ground first is the
fired one
Two life preservers have identical volumes, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are fully submerged, one swimmer floats and the other one sinks. The buoyant force is greater on
the one that sinks
Consider two vertical tubes of equal cross-section area, one containing water and the other alcohol. If the liquid pressures at the bottom of the tubes are equal, both liquids would have equal
weights
Ice cubes submerged at the bottom of a liquid mixture indicate that the mixture
is less dense than ice
According to Newton, the greater the distance between gravitationally interacting objects, the __________
the less the gravitational force between them
What is the force of gravity on a 500-N woman standing on Earth's surface?
500-N
What is true for a circular orbit satellite?
It has a constant speed
When you float in fresh water, the buoyant force that acts on you is equal to your weight. When you float higher in the denser water of the Dead Sea, the buoyant force that acts on you is ____________
equal to your weight
A hydraulic device has two pistons, one with a small cross-section area, and another piston with a larger cross-section area. If a given force is applied to the small piston, the output force on the larger -area piston will be __________
greater
If a projectile is fired straight up at a speed of 10 m/s, neglecting air resistance, the time it takes to reach the top of its path is __________
1 s
Perturbations of planets are due to
interplanetary forces
A large block of wood and a small block of iron each register 2000 -N on a weighing scale. Taking buoyancy of air into account, which has the greater mass?
wood
Consider two planets in space that gravitationally attract each other. If the masses of both planets are doubled, and the distance between them doesn't change, then the force between them is ____________
four times as much
A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater?
both forces on each other are the same
A stone is thrown horizontally at a speed of 10 m/s from the top of a cliff. One second after leaving your hand its vertical velocity is _________
10 m/s
When a boat sails from fresh water to salt water, the boat will float_________
higher in the water
When a suction cup sticks to a wall it__________
is pushed to the wall by the atmosphere
A bullet fired from a rifle begins to fall_______
as soon as it leaves the barrel
Pascal's Principle applies to ______________
liquids
gases
Compared to the density of a kilogram of feathers, the density of a kilogram of lead is _____________
greater
A completely submerged object always displaces its own___________
volume of fluid
The tangential velocity of an Earth satellite is its velocity__________
parallel to the surface of Earth
Which has the greater density, a lake full of water, or cup full of lake water?
both have the same density
Two identical tubes are filled with liquid, one with fresh water and one with cooking oil. The pressure is greater at the bottom of the tube with __________
fresh water
The buoyant force acting on a one-ton blimp hovering in air is________
1-ton
Inside a freely falling elevator your ________
weight is zero
If your mass doubles, your weight
also doubles
With no air resistance, at what launch angle can a projectile motion reach maximum range?
45 degrees
A lobster crawls onto a bathroom scale submerged on the ocean bottom. Compared to its weight above the surface, its weight under water is ________
less
A boat loaded with wood floats in a swimming pool. When the wood is thrown overboard, the pool level________
remains unchanged
A rock suspended by a weighing scale weighs 3-N when submerged in water and 9-N out of water. What is the buoyant force on the rock?
6-N
A projectile that is fired vertically at 8 km/s from Earth's surface will________
rise and fall back to Earth's surface
Gravitational force is greater for a satellite in elliptical orbit when it is at ___________
perigee (the closest point)
When holes are drilled through the wall of a water tower, water will spurt out with the greatest speed from the hole closest to
bottom of the tower
Compared with an alcohol barometer, the column height for a water barometer would be_________
higher
The block that displaces the greatest volume of water when submerged is a
1-kg block of aluminum
Two objects move towards each other due to gravity. As the objects get closer and closer, the acceleration of each___________
increases
Heat is thermal energy that matter ___________
transfers
Ice tends to form at the________
surface of bodies of water
When two lightbulbs are connected in parallel to a battery, the electric resistance that the battery senses is__________
less than the resistance of either lightbulb
Food in boiling water cooks slower in high altitude locations. If you increase the stove temperature under the pot the food will cook_________
neither of these
The final temperature of 1 liter of 40 degrees C water poured into 1 liter of 20 degrees C water is_________
at or about 30 degrees
When salt is introduced to water, the temperature at which freezing occurs is
lowered
In a home steam radiator, thermal energy is released mainly by _________
condensation
A charging process is simply a process that transfers__________. When you rub a glass stick with silk, the glass loses electrons to the silk and becomes ___________ charged. And the silk gets _________ charged. The amount of charge the silk has is equal to the charge the glass stick has, this follows the law of __________. Then both the glass stick and the silk become sticky to a neutral feather because of its __________
-electrons
-negatively
-positively
-conservation of energy
-polarization
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