Unit 2 Test, Conceptual Physics (Multiple Choice)

The law of inertia states that an object...

A. will continue moving in a straight line unless an outside force acts on it.

B. at rest will remain at rest unless acted on by an outside force.

C. that is not moving will never move unless a force acts on it.

D. All of the Above

D. All of the Above

A bag of sports equipment has a mass of 10 kilograms and a weight of...

A. 0.98 N

B. 980 N

C. 98N

D. 9.8 N

C. 98N (W= mg)

Friction is a force that always acts...

A. in the same direction as an object's motion

B. opposite to an object's motion

C. perpendicular to an object's motion

B. opposite to an object's motion

The mass of a lamb that weighs 110 N is about...

A. 1100 kg

B. 110 kg

C. 1 kg

D. 11 kg

D. 11 kg

The law of inertia applies to...

A. objects at rest

B. moving objects

C. both moving and non-moving objects

C. both moving and non-moving objects

You and a friend are jumping on a trampoline. Why does Earth, which is rapidly orbiting around the sun, not move under your feet when you jump?

A. Newton's third law holds that there is an equal and opposite force exerted by the trampoline on your feet, which allows you to move with Earth through space.

B. There are no different rules in space and on the surface of the earth.

C. Newton's second law holds that the acceleration produced by the force of gravity is offset by the force of friction on your feet.

D. Newton's first law holds that your body moves along with Earth because it is not compelled to change its motion by an unbalanced force.

D. Newton's first law holds that your body moves along with Earth because it is not compelled to change its motion by an unbalanced force.

Which has more mass, a kilogram of feathers or a kilogram of iron?

A. Neither--they both have the same mass

B. The iron

C. The feathers

A. Neither--they both have the same mass

The astronomer Copernicus publicly stated in the 1500s that Earth...

A. is slowing down

B. moves in a straight line

C. does not move

D. is the center of the solar system

E. revolves around the sun

E. revolves around the sun

After a cannonball is fired into friction-less space, the amount of force needed to keep it going equals...

A. one half the force with which it was fired.

B. twice the force with which it was fired.

C. the same amount of force with which it was fired.

D. zero, since no force is necessary to keep it moving.

D. zero, since no force is necessary to keep it moving.

One object has twice as much mass as another object. The first object also has twice as much...

A. inertia

B. velocity

C. gravitational acceleration

D. all of the above

A. inertia

Compared to its mass on Earth, the mass of a 10kg object on the moon is...

A. less

B. more

C. the same

C. the same

An object weighs 30N on Earth. A second object weighs 30N on the moon. Which has the greater mass?

A. The one on the moon

B. The one on Earth

C. They have the same mass

A. The one on the moon

How much does a 3kg bag of bolts weigh?

A. 29.4 N

B. 58.8 N

C. 22.8 N

D. 7.2 N

A. 29. 4 N (W=mg)

A sports car has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the sports car?

A. 300N

B. 2250 N

C. 1500 N

D. 7500 N

D. 7500 N (F=ma)

How much force is needed to accelerate a 4.0 kg physics book to an acceleration of 2 m/s^2

A. 0 N

B. 24 N

C. 0.5 N

D. 8.0 N

D. 8.0 N

A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s/s. What is the mass of the car?

A. 8000 kg

B. 1000 kg

C. 667 kg

D. 2000 kg

D. 2000 kg (m= F/a)

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. The steel ball

B. The tennis ball

C. They both have the same acceleration

C. They both have the same acceleration

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

A. They both have the same force acting on them

B. The steel ball

C. The tennis ball

B. The steel ball

A jet has a mass of 40,000 kg. The thrust for each of the four engines is 20,000 N. What is the jet's acceleration when taking off?

A. 2 m/s^2

B. 0.5 m/s^2

C. 0.3 m/s^2

D. 1 m/s^2

A. 2 m/s^2

The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, it that...

A. the force acting on them is the same.

B. they have the same mass.

C. the ball with the larger force also has the larger mass.

D. the ball with the larger force also has the smaller mass.

C. the ball with the larger force also has the larger mass.

Accelerations are produced by...

A. masses

B. forces

C. velocities

D. accelerations

B. forces

A girl pulls on a 10 kg wagon with a constant force of 20 N. What is the wagon's acceleration?

A. 200 m/s^2

B. 10 m/s^2

C. 20 m/s^2

D. 2 m/s^2

D. 2 m/s^2

A book weighs 4 N. When held at rest in your hands, the net force on the book is...

A. 4 N

B. 0 N

C. 0.4 N

D. 39 N

B. 0 N

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

A. A woman standing in high-heel shoes

B. A woman standing in running shoes

C. A woman standing on skis

A. A woman standing in high-heel shoes

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

A. 1 N

B. 0.1 N

C. 9.8 N

D. 0 N

A. 1 N

The acceleration produced by a net force on an object is...

A. in the same direction as the net force

B. directly proportional to the mass of the object

C. inversely proportional to the mass of the object

D. all of the above

D. all of the above

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...

A. increase the total force on the ice

B. decrease the pressure on the ice

C. increase the pressure on the ice

D. decrease the total force on the ice

B. decrease the pressure on the ice

Pressure is defined as...

A. time per area

B. force per area

C. distance per time

D. velocity per time

B. force per area

When an object reaches terminal velocity its acceleration is...

A. 9.8 m/s^2

B. 0 m/s^2

C. 4.9 m/s^2

B. 0 m/s^2

When a woman stands with two feet on a scale, the scale reads 280 N. When she lifts one foot, the scale reads...

A. 280 N

B. more than 280 N

C. less than 280 N

A. 280 N

The unit of pressure is...

A. the Newton

B. newtons per meter

C. newtons per square meter (or pascals)

D. the meter

C. newtons per square meter (or pascals)

If your car runs out of gas, why can't you push on the car's windshield from inside the car to move it?

A. In order for the car to move, an outside force must be exerted on the car.

B. In order for the car to move, a force must be exerted by you on the car's windshield.

C. In order for the car to move, a force must be exerted by the exhaust gases on the car.

D. In order for the car to move, a force must be exerted by the car's windshield.

A. In order for the car to move, an outside force must be exerted on the car.

A man weighing 660 N sits on the floor. He exerts a force on the floor of...

A. 660 N

B. 66 N

C. 6.6 N

D. 6600 N

E. 1320 N

A. 660 N

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

A. The muscular effort in the player's arms

B. Friction of the ground against the player's shoes

C. The force the glove exerts on the ball

D. The player's grip on the glove

C. The force the glove exerts on the ball

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

A. larger

B. the same

C. smaller

A. larger

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

A. the large truck

B. the small car

C. neither -- both are the same

B. the small car

Forces always occur...

A. by themselves

B. in triplets

C. as singles quantities

D. in pairs

D. in pairs

According to Newton's third law, if you push gently on something, it will push...

A. on you only if you aren't moving.

B. on something only under the right conditions.

C. gently on something else.

D. gently on you.

D. gently on you.

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

A. friction of the ground against the archer's feet.

B. arrow's push against the bowstring.

C. weight of the arrow.

D. air resistance against the bow.

B. arrow's push against the bowstring.

If a horse pulls on a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be set into motion?

A. No, because the forces cancel each other.

B. Yes, because the horse's pull on the wagon is larger than the wagon's pull on the horse.

C. Yes, because there is a time delay between action and reaction.

D. Yes, because there is a net force acting on the wagon.

D. Yes, because there is a net force acting on the wagon.

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?

A. The force of the ball against the bat

B. The weight of the ball

C. The grip of the player's hand against the bat

D. Air resistance on the ball

A. The force of the ball against the bat

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

A. Earth and moon are simply pulling on each other.

B. Earth's and moon's pulls comprise an action-reaction pair.

C. both a and b

D. neither a or b

C. both a and b

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. Always false

B. Always true

C. Sometimes true

B. Always true

A person attracted towards the center of Earth by 230 N gravitational force. The force with which Earth is attracted toward the person is...

A. very very small

B. very very large

C. 230 N

C. 230 N

As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force?

A. Nonexistent in this case

B. Air resistance acting against the ball

C. The acceleration of the ball

D. The pull of the ball's mass on the Earth

D. The pull of the ball's mass on the Earth

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

A. The car and the tree mutually exert equal forces in the same direction

B. The car and the tree mutually exert equal and opposite forces on each other

C. The car and the tree mutually exert different forces in the same direction

D. The car and the tree mutually exert different and opposite forces on each other

B. The car and the tree mutually exert equal and opposite forces on each other

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

A. of the exhaust gases on the rocket

B. of the rocket on the exhaust gases

C. neither A nor B

A. of the exhaust gases on the rocket

A karate chop delivers a blow of 2900 N to a board that breaks. The force that acts on the hand during this feat...

A. cannot be determined

B. is less than 2900 N

C. is 2900 N

D. is more than 2900 N

C. is 2900 N

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

A. smaller

B. larger

C. the same

D. Need more information to say

C. the same

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

A. road

B. tires

C. air

D. engine

A. road