Quiz about Conservation of Mechanical Energy

Question 1

At which point will the pendulum have the greatest potential energy?

Accepted Answer

A

Answer

B

Answer

C

Question 2

At which point is Kinetic Energy the least?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 3

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

Accepted Answer

B

Answer

A

Answer

C

Question 4

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

Accepted Answer

increasing

Answer

decreasing

Answer

staying the same

Answer

zero

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 30-kg boy, climbs a 3-m high tree. About how much potential energy did the boy gain?

Accepted Answer

900 J

Answer

90 J

Answer

9000 J

Answer

0 J

Question 12

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 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

D) 500 J

Answer

A) 50 J

Answer

B) 100 J

Answer

C) 250 J

Question 14

A pendulum is released from a height of 2 meters. At its lowest point, its speed is 6 m/s. What is the mass of the pendulum bob? (Assume no energy is lost to air resistance)

Accepted Answer

B) 1 kg

Answer

A) 0.5 kg

Answer

C) 2 kg

Answer

D) 3 kg

Question 15

A roller coaster car of mass 200 kg is at the top of a 20-meter high hill. What is its potential energy at the top?

Accepted Answer

C) 20000 J

Answer

A) 2000 J

Answer

B) 4000 J

Answer

D) 40000 J

Conservation of Mechanical Energy

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