Question 1

What does it mean for a physical quantity in a system to be conserved?

Accepted Answer

A) It is used in the most efficient manner possible. 
B) It stays in its original state forever. 
C) The total amount of it in the system stays constant. 
D) none of the above. 
A) It is used in the most efficient manner possible. 
B) It stays in its original state forever. 
C) The total amount of it in the system stays constant. 
D) none of the above.

Question 2

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
-Kinetic energy __________ conserved.

Accepted Answer

The answer of Consider a situation where a skater pulls...

Question 3

​Match each item with the correct statement below.​
-associated with circular motion

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 
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

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 4 J.

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) is definitely conserved. 
B) is definitely not conserved. 
C) may or may not be conserved,depending on the nature of the collision. 
D) none of the above 
A) is definitely conserved. 
B) is definitely not conserved. 
C) may or may not be conserved,depending on the nature of the collision. 
D) none of the above

Question 6

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.
-Linear momentum __________ conserved.

Accepted Answer

The answer of Consider a situation where a skater pulls...

Question 7

​Match each item with the correct statement below.​
-the energy source for a hydroelectric power station

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 
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

Question 8

As a skier gains speed skiing down a slope,______ energy is being converted to _________ energy.

Accepted Answer

The answer of As a skier gains speed skiing down...

Question 9

Momentum is conserved only when there is no friction.

Accepted Answer

A) True 
 B)False

Question 10

When more people ride upward in an elevator,more power is required.

Accepted Answer

A) True 
 B)False

Question 11

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

Accepted Answer

A) is definitely conserved. 
B) is definitely not conserved. 
C) may or may not be conserved,depending on the nature of the collision. 
D) none of the above 
A) is definitely conserved. 
B) is definitely not conserved. 
C) may or may not be conserved,depending on the nature of the collision. 
D) none of the above

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

Kinetic energy is conserved in __________ collisions.

Accepted Answer

The answer of Kinetic energy is conserved in __________ collisions....

Question 14

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.
-After you drop the box and it has fallen half way,its potential energy is __________ and its kinetic energy is __________.

Accepted Answer

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

Question 15

A person runs up a long flight of stairs in 10 seconds.If the person's weight is 600 N and the vertical height of the stairs is 20 meters,the person's power output is __________.

Accepted Answer

The answer of A person runs up a long flight...

Question 16

A hunter notches a 0.05-kg arrow in a compound bow and draws the arrow back to set the bow.The hunter does 50 J of work in the process setting the bow/arrow combination and then releases the arrow.The speed of the arrow is ___________.

Accepted Answer

The answer of A hunter notches a 0.05-kg arrow in...

Question 17

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 mv 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. 
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 18

Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.
-What is the work done by the force?

Accepted Answer

A) 150 J 
B) 50 J 
C) 75 J 
D) undetermined-not enough information given 
E) none of the above 
A) 150 J 
B) 50 J 
C) 75 J 
D) undetermined-not enough information given 
E) none of the above

Question 19

The collision between two cars in an accident is an inelastic collision.

Accepted Answer

A) True 
 B)False

Question 20

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.
-His kinetic energy at the top of the hill is

Accepted Answer

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

What does it mean for a physical quantity in a system to be conserved?

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Kinetic energy __________ conserved.

Match each item with the correct statement below. -associated with circular motion

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 4 J.

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

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Linear momentum __________ conserved.

Match each item with the correct statement below. -the energy source for a hydroelectric power station

As a skier gains speed skiing down a slope, energy is being converted to ___ energy.

Momentum is conserved only when there is no friction.

When more people ride upward in an elevator,more power is required.

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

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

Kinetic energy is conserved in __________ collisions.

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -After you drop the box and it has fallen half way,its potential energy is and its kinetic energy is .

A person runs up a long flight of stairs in 10 seconds.If the person's weight is 600 N and the vertical height of the stairs is 20 meters,the person's power output is __________.

A hunter notches a 0.05-kg arrow in a compound bow and draws the arrow back to set the bow.The hunter does 50 J of work in the process setting the bow/arrow combination and then releases the arrow.The speed of the arrow is ___________.

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 mv is

Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds. -What is the work done by the force?

The collision between two cars in an accident is an inelastic collision.

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. -His kinetic energy at the top of the hill is

The Study of Motion

Newtons Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Electromagnetism and Em Waves

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

Filters

Exam 3: Energy and Conservation Laws

What does it mean for a physical quantity in a system to be conserved?

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Kinetic energy __________ conserved.

​Match each item with the correct statement below.​ -associated with circular motion

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 4 J.

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

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. -Linear momentum __________ conserved.

​Match each item with the correct statement below.​ -the energy source for a hydroelectric power station

As a skier gains speed skiing down a slope,______ energy is being converted to _________ energy.

Momentum is conserved only when there is no friction.

When more people ride upward in an elevator,more power is required.

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

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

Kinetic energy is conserved in __________ collisions.

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -After you drop the box and it has fallen half way,its potential energy is __________ and its kinetic energy is __________.

A person runs up a long flight of stairs in 10 seconds.If the person's weight is 600 N and the vertical height of the stairs is 20 meters,the person's power output is __________.

A hunter notches a 0.05-kg arrow in a compound bow and draws the arrow back to set the bow.The hunter does 50 J of work in the process setting the bow/arrow combination and then releases the arrow.The speed of the arrow is ___________.

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 mv is

Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds. -What is the work done by the force?

The collision between two cars in an accident is an inelastic collision.

A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. -His kinetic energy at the top of the hill is

The Study of Motion

Newtons Laws

Physics of Matter

Temperature and Heat

Waves and Sound

Electricity

Electromagnetism and Em Waves

Optics

Atomic Physics

Nuclear Physics

Special Relativity and Elementary Particles

Filters

Match each item with the correct statement below. -associated with circular motion

Match each item with the correct statement below. -the energy source for a hydroelectric power station

As a skier gains speed skiing down a slope, energy is being converted to ___ energy.

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m. -After you drop the box and it has fallen half way,its potential energy is and its kinetic energy is .