had inertia. had gravity. lost energy. had accelerated. 1. A school bus was stopped. After a short time it was going 55 miles per hour. This is evidence that the school bus had inertia. had gravity. lost energy. had accelerated.

2. A staircase is most like what type of simple machine? A. lever B. wedge C. inclined plane D. wheel and axle

3. Shaina uses a shovel to dig a hole to plant a tree 3. Shaina uses a shovel to dig a hole to plant a tree. A shovel is an example of a compound machine because it is made up of what two simple machines? wheel and axle and lever lever and wedge screw and wedge inclined plane and wedge

a lever a pulley a screw a wedge 4. The bottom of this light bulb is an example of what type of simple machine? a lever a pulley a screw a wedge

5. The bulb of a thermometer is placed in your mouth 5. The bulb of a thermometer is placed in your mouth. Which of the following explains why the level of the liquid rises in the thermometer? Hot air rises inside the thermometer. Heat energy changes into light energy. The liquid expands when heated. Heat can change a solid into a liquid.

6. Which best explains why a person using a ramp can load heavy boxes onto a truck more easily than a person can using only human strength? The person using a ramp needs less force. The person using human strength needs less force. The ramp reduces the weight of the boxes. Friction makes it harder to lift boxes without a ramp.

7. Two jars are placed inside an insulated box 7. Two jars are placed inside an insulated box. One jar contains ice water and the other contains hot soup. What will happen to the two liquids? Both the hot soup and the ice water will gain heat. Both the hot soup and the ice water will lose heat. The hot soup will gain heat and the ice water will lose heat. The hot soup will lose heat and the ice water will gain heat.

8. When water boils in a pan on a hot burner, heat gets to the water mainly by conduction of heat through the pan. radiation of heat through the pan. reflection of heat from the burner. absorption of heat from the air in the room.

9. When electrical energy is "used" by an electric light, what really happens to the energy? It is given off as other forms of energy. It changes to matter. It stops at the electric light. It disappears.

10. When doing work using simple machines, what happens when the effort distance is increased? The effort force is decreased. The effort force is increased. The resistance force is increased. The direction of the effort force is changed.