conservation of energy

Reorder

Put these objects in order from LEAST to GREATEST energy.

• a golf ball at rest on the ground

• a golf ball being held above the ground, waiting to be dropped

• a golf ball rolling slowly down the hall

• a golf ball rolling quickly down the hall

• a golf ball that's been hit with a lot of force by a golf club

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

How much work is being done with 200 N of force to the right on object that moves 426 meters to the right? (assume the force and displacement are in the same direction)

• 85,200 J

• 45,620 J

• 90,480 J

• 62,329 J

Multiple Choice

What does the work/energy theorem state?

• Change in object's KE = work done by one force

• Change in object's KE = sum of work done on the object BY ALL FORCES

• Work is negative when force and motion are in opposite directions

• Energy of the object decreases by an amount equal to W

Multiple Choice

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

• A

• B

• C

• D

• E

Multiple Choice

What does the height of the bar in the graph represent?

• The distance traveled

• The amount of work or energy

• The speed of the ball

• The time taken

Multiple Choice

What is the relationship between the work done on the ball and its kinetic energy when catching it?

• The work is positive and kinetic energy increases

• The work is negative and kinetic energy decreases

• The work is zero and kinetic energy remains constant

• The work is positive and kinetic energy remains constant

Multiple Choice

Which graph best represents the relationships between mass and kinetic energy?

• A

• B

• C

• D

Multiple Choice

What types of energy does the toy oven use to bake the cakes?

• Light and sound

• Electrical and thermal

• Thermal and mechanical

• Mechanical and electrical

Multiple Choice

How does energy change?

• The cart has more kinetic energy at the top than when it is going down the hill.

• The cart has potential energy at the top while kinetic energy increases going down.

• The cart has potential energy that is lost going down the hill.

• The cart has kinetic energy at the top of the hill and no potential energy.

Multiple Choice

At which point does the ball has the greatest gravitational potential energy (GPE)?

• A

• G

• D

• C

• G

Multiple Choice

Elastic potential energy is energy stored in an object, such as a spring, due to the object being stretched or compressed. In which position is it most likely that the spring has lost its elastic potential energy?

• W

• Y

• X

• Z

Multiple Choice

What kind of energy transformation is needed for this girl to hear the music in her head phones?

• electrical to sound

• mechanical to sound

• sound to electrical

• sound to mechanical

Multiple Choice

A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 47.0 kg runs at this speed. What is the cheetah’s kinetic energy?

• 1457 Joules

• 22,584 Joules

• 15 Joules

• 45,167Joules

Multiple Choice

A part of a roller coaster’s track is shown. Assume friction is negligible.

Identify where the roller coaster car has the most gravitational potential energy (GPE).

• Point A

• Point B

• Point C

• Point D

Fill in the Blanks

A roller coaster car, 500 kg with its passengers, reaches the top of the first hill, 20 meters above the ground. (g = 9.8 m/s2) What is the GPE?

Multiple Choice

How does the gravitational potential energy change if the height of an object is doubled?

• It remains the same

• It is halved

• It is doubled

• It is quadrupled

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident