Question

w=fd means:

• work is being done on a system (force x direction)
• work is being done on a system (force x distance)

question 8

this is an example of kinetic energy:

• a rollercoaster rolling down a hill
• a rollercoaster sitting at the bottom of the hill
• a rollercoaster sitting on the top of a hill

question 9

this is an example of potential energy:

• a rollercoaster sitting at the bottom of the hill
• a rollercoaster rolling down a hill
• a rollercoaster sitting on the top of a hill

Explanation:

Define work in physics

Using the Scientific Definition of Work knowledge point, work is defined as force applied over a distance.

$$ W = F \cdot d $$

This represents force multiplied by distance.

Define kinetic energy

Kinetic energy is the energy of motion. Any object that is moving has kinetic energy.

• A rollercoaster rolling down a hill is moving, so it has kinetic energy.
• A rollercoaster sitting still has zero kinetic energy.

Define potential energy

Potential energy is stored energy based on position.

• A rollercoaster sitting at the top of a hill has high gravitational potential energy due to its elevated position.

Answer:

Question 1

• work is being done on a system (force x direction)
• work is being done on a system (force x distance) (Correct answer)

Question 8

• a rollercoaster rolling down a hill (Correct answer)
• a rollercoaster sitting at the bottom of the hill
• a rollercoaster sitting on the top of a hill

Question 9

• a rollercoaster sitting at the bottom of the hill
• a rollercoaster rolling down a hill
• a rollercoaster sitting on the top of a hill (Correct answer)