Question 1

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.
-The increase of potential energy of the box is 100 J.

Accepted Answer

A) True 
 B)False

Question 2

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.
-He slides all the way down to the valley bottom where his gravitational potential energy becomes zero.His kinetic energy at the bottom will be

Accepted Answer

A) 0 J. 
B) 500 J. 
C) some value between 0 and 500 J. 
D) none of the above.

Question 3

A 2 kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s,and they stick together.After the collision,the velocity of the combined bodies is 0.8 m/s pointing towards the left.

Accepted Answer

A) True 
 B)False

Question 4

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.
-The work you do is __________.

Accepted Answer

The answer of Consider a situation where you carry a...

Question 5

Which of the following quantities are conserved in an isolated system?

Accepted Answer

A) mass 
B) energy 
C) momentum 
D) all of the above

Question 6

Consider a situation where two moving objects collide and rebound from each other.
-Kinetic energy is definitely conserved.

Accepted Answer

A) True 
 B)False

Question 7

Linear momentum is conserved in

Accepted Answer

A) an inelastic collision. 
B) an elastic collision. 
C) any collision where two objects rebound off each other. 
D) none of the above.

Question 8

The mass of 1 cubic meter of fresh water is 1,000 kg.At the top of a 100 m hydroelectric dam the potential energy of the cubic meter of water is

Accepted Answer

A) 10,000 N. 
B) 98,000 N. 
C) 100,000 N. 
D) 980,000 N.

Question 9

The energy in the water at the top of a waterfall is an example of __________ energy.

Accepted Answer

The answer of The energy in the water at the...

Question 10

Consider a situation where two moving objects collide, stick to each other, and move off together.
-Kinetic energy is definitely not conserved.

Accepted Answer

A) True 
 B)False

Question 11

Work done within an isolated system can increase the energy of the system.

Accepted Answer

A) True 
 B)False

Question 12

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.
-The kinetic energy of the crate is __________.

Accepted Answer

The answer of Consider a situation where you exert a...

Question 13

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
-Linear momentum is not conserved.

Accepted Answer

A) True 
 B)False

Question 14

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t.
-The quantity Fd/t is

Accepted Answer

A) the kinetic energy of the crate. 
B) the potential energy of the crate. 
C) the linear momentum of the crate. 
D) the work you do on the crate. 
E) the power you supply to the crate.

Question 15

If a force on an object is aimed opposite the direction of the object's velocity,the force does

Accepted Answer

A) no work. 
B) positive work. 
C) negative work. 
D) any of the above.

Question 16

The linear momentum of a truck will be greater than that of a bus if

Accepted Answer

A) the truck's mass is larger than the bus's but its speed is the same. 
B) the truck's speed is larger than the bus's but its mass is the same. 
C) the truck's mass and speed are both larger than the bus's. 
D) any of the above.

Question 17

Consider a situation where two moving objects collide, stick to each other, and move off together.
-Internal energy

Accepted Answer

A) remains constant. 
B) decreases. 
C) increases. 
D) varies but in a way that cannot be predicted.

Question 18

A watt is equal to

Accepted Answer

A) 746 horsepower. 
B) one calorie. 
C) one joule. 
D) 1 J/s. 
E) a unit of energy.

Question 19

The energy stored in a stretched spring is an example of gravitational potential energy.

Accepted Answer

A) True 
 B)False

Question 20

​Match each item with the correct statement below.​
-the rate of doing work

Accepted Answer

A) ​angular momentum 
B) ​elastic collision 
C) ​elastic potential energy 
D) ​energy 
E) ​gravitational potential energy
F)​heat
G)​inelastic collision
H)​kinetic energy
I)​lever
J)​linear momentum
K)​power
L)​work
M)​internal energy

Exam 3: Energy and Conservation Laws

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -The increase of potential energy of the box is 100 J.

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. -He slides all the way down to the valley bottom where his gravitational potential energy becomes zero.His kinetic energy at the bottom will be

A 2 kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s,and they stick together.After the collision,the velocity of the combined bodies is 0.8 m/s pointing towards the left.

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -The work you do is __________.

Which of the following quantities are conserved in an isolated system?

Consider a situation where two moving objects collide and rebound from each other. -Kinetic energy is definitely conserved.

Linear momentum is conserved in

The mass of 1 cubic meter of fresh water is 1,000 kg.At the top of a 100 m hydroelectric dam the potential energy of the cubic meter of water is

The energy in the water at the top of a waterfall is an example of __________ energy.

Consider a situation where two moving objects collide, stick to each other, and move off together. -Kinetic energy is definitely not conserved.

Work done within an isolated system can increase the energy of the system.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The kinetic energy of the crate is __________.

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Linear momentum is not conserved.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The quantity Fd/t is

If a force on an object is aimed opposite the direction of the object's velocity,the force does

The linear momentum of a truck will be greater than that of a bus if

Consider a situation where two moving objects collide, stick to each other, and move off together. -Internal energy

A watt is equal to

The energy stored in a stretched spring is an example of gravitational potential energy.

Match each item with the correct statement below. -the rate of doing work

Exam 3: Energy and Conservation Laws

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -The increase of potential energy of the box is 100 J.

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. -He slides all the way down to the valley bottom where his gravitational potential energy becomes zero.His kinetic energy at the bottom will be

A 2 kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s,and they stick together.After the collision,the velocity of the combined bodies is 0.8 m/s pointing towards the left.

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -The work you do is __________.

Which of the following quantities are conserved in an isolated system?

Consider a situation where two moving objects collide and rebound from each other. -Kinetic energy is definitely conserved.

Linear momentum is conserved in

The mass of 1 cubic meter of fresh water is 1,000 kg.At the top of a 100 m hydroelectric dam the potential energy of the cubic meter of water is

The energy in the water at the top of a waterfall is an example of __________ energy.

Consider a situation where two moving objects collide, stick to each other, and move off together. -Kinetic energy is definitely not conserved.

Work done within an isolated system can increase the energy of the system.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The kinetic energy of the crate is __________.

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Linear momentum is not conserved.

Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. -The quantity Fd/t is

If a force on an object is aimed opposite the direction of the object's velocity,the force does

The linear momentum of a truck will be greater than that of a bus if

Consider a situation where two moving objects collide, stick to each other, and move off together. -Internal energy

A watt is equal to

The energy stored in a stretched spring is an example of gravitational potential energy.

​Match each item with the correct statement below.​ -the rate of doing work

Match each item with the correct statement below. -the rate of doing work