Which statement best describes the acceleration of an atwood machine?

It experiences constant acceleration.

It experiences constantly changing acceleration.

It experiences negative acceleration.

It experiences increasing acceleration.

A metal ball with a mass of 5 kg is released at the same time as a wooden ball with a 1 kg mass. How does the acceleration of the center of mass of the metal ball compare to the wooden ball?

The acceleration of both is the same.

The acceleration of the metal ball is five times greater.

The acceleration of the wooden ball is 1/3 less.

The acceleration is initially greater on the metal ball but becomes even over time.

An elevator carrying a person of mass m is moving upward and slowing down. How does the magnitude F of the force exerted on the person by the elevator floor compare with the magnitude mg of the gravitational force?

F can be greater or smaller depending on the speed of the elevator.

Wall-E throws a battery to EVE while they are floating in outer space. In what direction will Wall-E move when he throws the battery?

The opposite direction to the throw.

The same direction as the throw.

Wall-E throws a battery to EVE while they are floating in outer space. In what direction will EVE move when she catches it?

The same direction as the throw.

The opposite direction to the throw.

What is the force of gravity according to Newton?

A force of attraction between all objects due to mass.

A force that attracts celestial objects to each other.

A force that pulls all things down.

A hole that passes through space-time.

How is the force of gravity related to the distance between the objects?

Gravity is inversely proportional to the square of the distance.

Gravity is directly proportional to distance.

Gravity is proportional to the square of the distance.

Gravity is not related to distance.

How is the force of gravity related to the mass of the objects?

Gravity is directly proportional to mass.

Gravity is inversely proportional to the square of the masses.

Gravity is proportional to the square of the masses.

Gravity is not related to mass.

How is Newton's second law important for a rocket launch?

The rocket burns fuel to become lighter and require less force.

The burning fuel exerts a force downward, which causes an upward reaction force.

The object will remain in motion once it leaves the pull of Earth's gravity.

The sum of forces will be in equilibrium as the rocket launches.

Is it possible for the object in the diagram to be moving to the right and have this FBD?

Yes. It could be moving at a constant velocity.

Yes. It's possible that the x forces were just left off the diagram.

No. The FBD shows that the system is in equilibrium.

A man standing on a scale in an elevator notices that the scale reads 40 newtons greater than his normal weight. Which type of movement of the elevator could cause this greater-than-normal reading?

Upward acceleration of the elevator

Downward acceleration of the elevator

How is Newton's second law important for a rocket launch?

The rocket burns fuel to become lighter and require less force.

The burning fuel exerts a force downward, which causes an upward reaction force.

The object will remain in motion once it leaves the pull of Earth's gravity.

The sum of the forces will be in equilibrium as the rocket launches.

An elevator carrying a person of mass m is moving downward and slowing down. How does the magnitude F of the force exerted on the person by the elevator floor compare with the magnitude mg of the gravitational force?

F can be greater or less depending on the speed of the elevator

Which experiment would measure inertial mass?

A block is pushed with a known force to a specific acceleration.

A block is placed on an electronic scale and the result is multiplied by 9.8.

A block is hung vertically from a spring to determine the displacement.

An astronaut is floating away from his space station. How can they get back?

Expel some of the air supply in the opposite direction that they want to go.

Throw their tools in the direction they want to go.

Move their feet in opposite directions to each other while pointed away from the station.

Which is an example of friction acting in the direction of motion?

A person walking across the floor.

A ball coming to rest after rolling across the floor.

Brakes being applied to stop a car.

Rubbing your hands together to get warm.

How is static friction different than kinetic friction?

Static friction prevents motion, while kinetic friction occurs during motion.

Static friction and kinetic friction have no effect on motion.

Static friction and kinetic friction are the same thing.

Static friction allows motion, while kinetic friction prevents motion.

AP Dynamics

Authored by Katie Scarborough

Physics

9th - 12th Grade

NGSS covered

Used 4+ times

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56 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An object can exert a force on itself.

True

False

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A basketball is bounced against the ground. How does the force exerted by the ball on the ground compare with the force exerted by the ground on the ball?

The force exerted by the ball is greater.

The forces exerted by the ball and the wall have the same magnitude.

The force exerted by the ball is smaller.

The relative magnitudes cannot be determined.

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A person is riding in an elevator going down and increasing in speed. Which of the following is correct about the force F(P) that is exerted by the floor of the elevator on the person?

F(P) is equal to the normal force, where F(P) is larger as the person moves down.

F(P) is equal to the normal force, which decreases as the person moves down.

F(P) is equal to the force of gravity, which does not change as the person moves down.

F(P) is equal to the force of gravity, which decreases as the person moves down.

Tags

NGSS.HS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Action and reaction forces are always acting

on the same object.

on different objects.

in the same direction.

up.

Tags

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Action and reaction forces are always acting

on the same object.

in opposite directions.

in the same direction.

up.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Action: When a swimmer pushes on water backward

the water pushes the swimmer forward (reaction).

the swimmer moves backward (reaction).

the water moves backward (reaction).

nothing happens.

Tags

NGSS.HS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statement is true about friction?

Friction can act in the direction of motion.

Friction always slows an object down.

Friction is calculated using the coefficient of friction times the force of gravity.

Friction cannot occur if an object is stationary.

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AP Dynamics

An object can exert a force on itself.

A basketball is bounced against the ground. How does the force exerted by the ball on the ground compare with the force exerted by the ground on the ball?

A person is riding in an elevator going down and increasing in speed. Which of the following is correct about the force F(P) that is exerted by the floor of the elevator on the person?

Action and reaction forces are always acting

Action and reaction forces are always acting

Action: When a swimmer pushes on water backward

Which statement is true about friction?

Two masses, m1 and m2, are attached to each other by a string on a frictionless table. m1 is pulled to the right by an applied force (Fp). What is the correct equation for the motion of block m2? Ft is the tension of the string.

Which statement best describes the acceleration of an atwood machine?

How can you determine the acceleration of an Atwood's Machine?

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