Lesson 1: Energy, Motion, Force and Work

If an object is moving in a certain direction, does that mean that force is also going in the same direction?

• yes because force must be going in same direction for something to move
• no because force and motion can go in different directions
• yes because force and motion always go in the same directions
• no because force and motion never go in the same direction

What is this an example of?

• energy
• motion
• force
• work

What can force do

• make an object move
• slow an object down
• make a moving object stop moving
• all of the above

John pushes a chair up a ramp into a moving truck. Sally lifts the chair straight up to the moving truck. Sally says that he is doing more work because lifting the box takes more energy. Is Sally correct?

• Yes, using more force to move an object does more work.
• No, John is doing more work because he has to travel farther to move the box up the ramp.
• No, they are doing the same amount of work because their force multiplied by their distance is the same.

Four students are each pushing on one side of a box. Mara is pushing to the west, Cindi is pushing to the east, Chris is pushing to the north, and Sammy is pushing to the south. If the box moves to the east, which student does work on the box?

• Mara
• Cindi
• Chris
• Sammy

When a person rides a scooter, their weight exerts____________ on the motorcycle.

• energy
• force
• work

The motorcycle moving a person around a track is an example of the motorcycle performing __________.

• energy
• force
• work

What unit is used to measure force?

• Joule
• Watt
• Newton

What unit is used to measure work?

• Joule
• Watt
• Newton

I used a force of 15 N to push my TV away from the wall a distance of 3 m. How much WORK did I do?

• 5 J
• 45 J
• 5 w
• 45 w