A block is dragged without acceleration in a straight-line path across a level surface by a force of 11-N. What is the frictional force between the block and the surface?

As a care package falls from a high-flying stationary helicopter, its velocity increases and its acceleration

A 15-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is

Aunt Minnie throws a rock downward, and air resistance is negligible. Compared to a rock that is dropped, the acceleration of the rock after it is thrown is

Consider a ball rolling down the decreasing slope inside a semicircular bowl. As the ball rolls from the rim downward toward the bottom, its rate of gaining speed

Which of the following would exert the most pressure on the ground?

A tennis ball and a steel ball with the same diameter are dropped at the same time. Which ball has the greater force acting on it?

A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg book is

An apple weighs 1 N. The net force on the apple when it is in free fall is

Suppose the force of friction on a sliding object is 40 N. The force needed to maintain a constant velocity is

When a women stands with two feet on the scale, the scale reads 300 N. When she lifts one foot, the scale reads

If you pull on a couch horizontally with a force of 150 N and the couch doesn't move, the friction force must be 150 N. Now if you pull with 210 N so the couch slides at a constant velocity, the friction force is

The unit of pressure is

Pressure is defined as

When an object teaches terminal velocity its acceleration is

The acceleration produced by a net force on an object is

You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl, this will

When the angle of an incline with a block resting on it increases, the normal support force

An apple weighs 1 N. When held at rest in your hands, the net force on the apple is

Accelerations are produced by

How does acceleration of an object change in relation to its mass? It is

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. In the absence of air resistance, which ball has the greater acceleration?

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is

Two people pull on a rope in a tug-of-war. Each pulls with 100 N of force. What is the tension in the rope?

An unfortunate bug splatters against the windshield of a moving car. Compared to the deceleration of the car, the deceleration of the bug is

A person is attracted towards the center of the Earth by a 210-N gravitational force. The force with which Earth is attracted toward the person is

A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force?

If you exert force of 12K N on a 3K kg car and a 6K kg truck that are both originally at rest, what will be the resulting acceleration of the objects?

A rocket is able to accelerate in the vacuum of space when it fires its engine. The force that propels the rocket is the force

An unfortunate bug splatter against the windshield of a moving car. Compared to the force on the bug, the force of the bug on the car is

Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object

A large truck and a small car traveling at the same time have a head-on collision. The vehicle to undergo the greater change in velocity will be

Earth pulls on the moon, and similarly the moon pulls on the Earth. This is evidence that

A highs school student hits a nail with a hammer. During the collision, there is a force

Force always occur

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow.The reaction to this force is the

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

Nellie Newton holds an apple in her hand. If action is Earth pulling on the apple, the. the reaction is

Suppose you accidentally drive into a tree. Which of the following correctly describes the interaction between your car and the tree?

In order to increase the final momentum of a golf ball, we could

Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher

In order to. catch a ball, a baseball player moves his hand backward in the direction of the balls motion. Doing this reduces the force of impact on the players hand principally because

Suppose a cannon is made of a strong but very light material. Suppose also the the cannonball is more massive than the cannon ball itself. For such a system

A collision is considered elastic if

Compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has

A freight train rolls along a track with considerable momentum. If it were to roll at the same speed but had twice as much mass, its momentum would be

Momentum of a system is conserved only when

The momentum change of an object is equal to the

If the momentum of an object changes and its mass remains constant

A meteor that originally was heading south breaks into two chunks. One of the chunks moves southwest. The second chance was not immediately found, but scientists guessed that they should look for the object

A 10 KG ball is thrown 6 m/s. What is the balls momentum?

A cannonball shot from a long-barrel cannon travels faster than one shot from a short-barrel cannon because the cannonball receives a greater

A car traveling along the g=highway needs a certain amount of force exerted on it to stop. More stopping force may be required when the car has

The momentum of an object is defined as the objects

A ball is moving at 2.0MS and has a momentum of 4.0 KGMS, what is the balls mass?

The reason Padded dashboards are used in cars is that they

Which of the following has the largest momentum

Which has more momentum, a large truck moving at 30 mph or small truck moving at 30 mph

A 4 KG ball has a momentum of 20 KGMS. What is the ball speed

How much further will a car traveling at 100 KMS scared in the same car traveling at 50 KMS

How much work is done on a 30N object that you lift 8M

A woman can lift barrels at a vertical distance of 2 m or can roll them up a 4 m long ramp to the same elevation. If she uses the ramp, the applied force required is

If you lift one load up two stories, how much work do you do compared to lifting one load up only one story

The unit of power is

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

Which requires more work: lifting a 80 KG sac vertically 5 m or lifting a 40 KG sac vertically 10 m

Potential energy is the energy an object has because of it

If Kelly the skater speed increases so he has three times the momentum, then his kinetic energy increases by

An object that has kinetic energy must have

All simple machines ideally work on the principle that

How much power is required to do 30 J of work on an object in three seconds

As a pendulum swings back-and-forth

The unit of work is

A machine puts out 50 W of power for every 100 W put into it. The efficiency of the machine is

And arrow in a bow has 50 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will it have after it has been shot

If an object has kinetic energy then it also must have

A pulley system can

The amount of potential energy possessed by an elevated object is equal to

Which has a greater angular speed, a horse near the outside rail of a merry go round or a horse near the inside real

Stunt motorcyclest biker Bob rides his bike inside a futuristic rotating space station- a giant rotating donut-shaped structure in space.

The normal support force feels like weight to him. As he rides his bike in the same direction that the station rotates the normal force

When a railroad train rounds a bank track, the centipetal force needed comes not from friction, but from the

A person weighs less at the equator than at the polls. The reason for this has to do with

A possible space habitat of the future is a cylinder in space rotating about its long access. What is the relative gravitational field along the access of the habitat

What is the direction of the force that acts on clothes in the spin cycle of a top loading washing machine

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

Earth rotates and revolves through space. Earth rotates about the ___, which is an ___ axis. Earth revolves about the ___, which is an ___ axis.

People in the future may well live inside a rotating space structure that is more than 2 km in diameter. Inside the structure, people on the inside of the outer edge will experience 1G while people halfway to the access will experience

If you whir A can on the end of a string in the string suddenly breaks, the can will

Which has a greater linear speed, a horse near the outside rail of a merry go round or a horse near the inside rail

Nelly Newton swings a rock into a circular path while holding an attached string overhead. The string makes a 45° angle to the vertical. The centripetal force that holds the rock in its circular path is the

Centrifugal forces or an apparent reality to observers in a reference frame that is

Which of the following is not a unit of rotational speed

A space habitat is designed so that the variation in G between a persons head and feet is less than 0.03G. If the person is 3 m tall then the radius of the habitat is

A tin can whirled on the end of string moves in a circle because

To weigh less in the northern hemisphere, you should go

Susie space Walker hovers in space beside a rotating space station in outer space. Both she and the center of mass of the space Station are at relative rest. If the space station is in Earth orbit, then Susie

As the rotational speed of a space habitat increases the weight of people inside

A fish suspended in water is in what kind of equilibrium

If an object is a neutral equilibrium, any displacement will

You push a table tennis ball beneath the surface of water in a glass of water. The center of gravity of the glass of water

If an object is in stable equilibrium, any displacement will

The center of mass of the solar system

When you carry a heavy load with one arm, why do you tend to hold your free arm away from your body

When a wrench is slid spinning over a frictionless table top, it sensor of gravity follows

Torque is defined as

A meter stick is balanced at the 50 cm Mark. U tie a 20 N weight at the 15 cm Mark. Where should a 40 N weight be placed so the meter stick will again be balanced

Where is the center gravity of a softball bat located

A picture hangs on a wall from a wire that is passed over a supporting nail. The picture is in stable equilibrium because

The long heavy tail of a spider monkey enable the monkey to easily vary its

To turn a stubborn screw it is best to use a screwdriver that has a

If an object is an unstable equilibrium any displacement will

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

Two people sit on a balance seesaw. When one person leans toward the center of the seesaw, that person‘s end of the seesaw will

A ball resting on the floor is in what kind of equilibrium

At the health spa, Felix flex finds that pulleys on the exercise machines are not circular, but are oval shaped. At diff orientations, the cams provide diff

An object thrown to the air with a spin rotates about its

based on stability concepts you would expect a very broad tree to have

An object will fall over if it’s center of gravity is

a wait on the end of a spring Bobs up and down one complete cycle every two seconds it’s frequency is

A wave created by shaking a rope up and down is called

Suppose a simple pendulum is suspended in an elevator. When the elevator is accelerating upward, the period of the pendulum

As the sound of a cars horn passes in recedes from you, the pitch of the horn seems to

When a pendulum clock is taken from sea level to the top of a high mountain, it will

During a single period, the distance traveled by a wave is

The distance between successive identical parts of a wave is called

Sound is an example of

An observer on the ground hears a sonic boom that is created by an airplane flying out of speed

Which of the following is not a transverse wave

The Dobler effect is the change in observe frequency due to

An aircraft that flies faster than the speed of sound is said to be

The amplitude of a particular wave is 2 m. The top to bottom distance of the disturbance is

Standing waves can be set up

what happens when an airplane is flying faster than the speed of sound

The source of all wave motion is a

A certain ocean wave has a frequency of .05 Hz and a wavelength of 10 m. What is the wave speed

When is sound source moves towards you, what happens to the wave speed

A child swings back-and-forth on a playground swing. If the child Stands rather than sits, the time for a to and fro swing is

A skipper on a boat notices Wavecrests passing the anchor chain every six seconds. The skipper estimates the distance between Crests at 30 m. What is the speed of the water waves

Two waves arrive at the same place at the same time exactly instead with each other. Each wave has an amplitude of 3 m. The resulting wave has an amplitude of