# Chapter 4 & 5, Lang

## 22 terms

### Which of the following does work?

a person pushing a book across the floor

### Which of the following will increase the amount of work you do pushing a box?

increasing the distance you push the box

energy

### Alice stands at the edge of a low diving board. If whe stands on a higher diving doard instead, she will

increase her potential energy

### A truck has twice the mass of a car. If the truck and the car are traveling at the same velocity,

The truck has twice the kinetic energy of the car

4000 J

### A freestyle skier skis off a ramp and does a maneuver in midair. As he does his trick, he has

both potential and kinetic energy

### Tom uses a crane to lift a box. The crane always does the same amount of work to lift the box. Tom could increase the crane's power by

increasing the speed with which it lifts the box

### Power is the rate at which work is done. This means that the power an object has is equal to the work it is doing divided by the

time it takes to do the work.

### The work a force does on an object depends on the

the size of the force and the distance it acts over

### A classmate lifts a book 50cm. You lift the same book 150 cm using the same force. Compared to your to your classmate, you have done

three times the work

Joules

### Sean pushes a cart 100m. Which of the following statements is TRUE?

Sean does work on the cart over the entire 100m.

### When Roger kicks a football, the football gains mechanical energy because Roger

does work on the football

98J

225 J

### To find the mechanical energy of an object,

add its kinetic energy and potential energy

480 J

8 W

### Brian wants to slide a chair across a carpeted floor. He could reduce the effect of friction by

putting a plastic sheet on the floor before he slides the chair

### The strength of the gravitational force between two objects depends on the objects'

masses and the distance between them

60 N