Quiz about Conservation of Mechanical Energy

Question 1

A skater starts with 200 J of KE and 1200 J of PEg. What is the PEg when KE=900 J?

Accepted Answer

500 J

Answer

900 J

Answer

1400 J

Answer

1000 J

Question 2

A 100 kg. skier starts at rest at the top of a 30. m hill. What is her total mechanical energy half-way down?

Accepted Answer

30,000 J

Answer

20,000 J.

Answer

15,000 J

Answer

60,000 J

Question 3

At which point is Kinetic Energy the least?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 4

At which point will the object both have Potential Energy and Kinetic Energy?

Accepted Answer

B

Answer

A

Answer

C

Question 5

A man dives off a cliff, on the way down his gravitational PE is:

Accepted Answer

decreasing

Answer

increasing

Answer

staying the same

Answer

zero

Question 6

An arrow is fired up in the air - on the way up, the KE is:

Accepted Answer

decreasing

Answer

increasing

Answer

staying the same

Answer

zero

Question 7

An arrow is fired up in the air - on the way up, the gravitational PE is:

Accepted Answer

increasing

Answer

decreasing

Answer

staying the same

Answer

zero

Question 8

A rollercoaster has 5000 J of Mechanical Energy. If PEg = 2000 J, what is the kinetic energy?

Accepted Answer

3000 J

Answer

5000 J

Answer

2000 J

Answer

0 J

Question 9

A 100 kg. skier starts at rest at the top of a 30. m hill. What is her total mechanical energy?

Accepted Answer

30,000 J

Answer

20,000 J.

Answer

10,000 J

Answer

40,000 J

Question 10

A 100 kg. skier starts at rest at the top of a 30. m hill. What is her KE at the bottom?

Accepted Answer

30,000 J

Answer

0 J.

Answer

15,000 J

Answer

60,000 J

Question 11

A child and sled with a combined mass of 60.0 kg slide down a friction-less hill that is 8.00 m high. If the sled starts from rest, what is the speed at the bottom of the hill?

Accepted Answer

12.5 m/s

Answer

8.85 m/s

Answer

78.4 m/s

Answer

73.5 m/s

Question 12

On a roller coaster, where is maximum potential energy?

Accepted Answer

At the top of a big hill

Answer

At the bottom of a big hill

Answer

When going around a corner

Answer

When going upside down

Question 13

A 5 kg object is dropped from a height of 10 meters. Assuming no air resistance, what is the kinetic energy of the object just before it hits the ground?

Accepted Answer

A) 490 J

Answer

B) 245 J

Answer

C) 98 J

Answer

D) 50 J

Question 14

Which of the following statements best describes the principle of conservation of mechanical energy?

Accepted Answer

B) The total mechanical energy of an isolated system remains constant if only conservative forces are acting.

Answer

A) Energy can be created or destroyed, but not transformed.

Answer

C) Mechanical energy is always conserved, regardless of the forces acting.

Answer

D) Kinetic energy is always greater than potential energy in a closed system.

Question 15

In a pendulum, at which point is the kinetic energy maximum?

Accepted Answer

B) At the lowest point of the swing

Answer

A) At the highest point of the swing

Answer

C) At the midpoint of the swing

Answer

D) Kinetic energy is constant throughout the swing

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