Force and Motion Unit Review

1. A red car is travelling at the same speed as a blue car travelling in the opposite direction. The red car’s __________________ is different from the blue car’s. Acceleration Speed Velocity None of the above.

2. What must happen for work to occur on an object? Force has to be applied and the object must move a certain distance Force has to be applied, but the object does not have to move. Force does not have to be applied, and the object does not have to move. All the above.

3. Why does a car speed up when travelling down a ramp? Balanced forces are acting on the car Unbalanced forces are acting on the car Both balanced and unbalanced forces are acting on the car None of the above.

4. A bowling ball requires more force to accelerate it than a tennis ball. Which law is this? Inertia Force and Acceleration Action Reaction None of the above.

5. A car is positioned at the bottom of a hill. The car has high ____________, but low ______________. Potential energy, kinetic energy Kinetic energy, potential energy Inertia, action-reaction Action-reaction, inertia

6.Force = mass x acceleration A ball has a mass of 30 g and an acceleration rate of.5 m/sec 2. What is the force acting on the ball? 1.5 N.15 N 6 N 15 N

7. What does a horizontal line mean on a speed/time graph? Increasing speed Decreasing speed Constant Speed The object is not moving.

8. When the car suddenly stops, your dog flies forward because he is not wearing a seatbelt. Which law is this? Inertia Force and Acceleration Action-Reaction None of the above.

9. A bus travels 30 km in 5 hours through ice and snow. What is it’s average speed? 150 km/hr 25 km/hr 6 km/hr.16 km/hr

10. A rocket has a mass of 200 kg. There is 400 N of Force applied. What is the rocket’s acceleration rate?

11. What energy transformations properly demonstrate how a battery powered flash light works? Light – chemical - mechanical Mechanical-chemical-light Light- chemical- thermal All of the above.

12. A ball slows down as it falls through the net of basketball goal is an example of__________. Speed Velocity Acceleration All of the above.

13. Plates in the earth’s crust often move to create earthquakes because _____________ are in action. Balanced forces Unbalanced forces Action-Reaction forces Velocity forces

14. A pitcher throws the ball towards home plate (west) at a speed of 100 km/hr. This is an example of ________. Speed Acceleration Velocity None of the above.

15. A boy tugs on the leash to his dog with a force of 20 N, but the dog tugs with 50 N of force. In which direction and with how much force does the boy move? The dog is pulled with 70 N of force. The boy is pulled with 70 N of force. The boy is pulled with 30 N of force. The dog is pulled with 30 N of force.

16. When a balloon car rocket is launched, the air rushes backwards but the car moves forward. Which law of motion does this illustrate? Inertia Force and Acceleration Action-Reaction None of the above.

17. A 30 kg car accelerates at 1.5 m/sec 2. How much force is acting on the car? 30 N 45 N 28.5 N 31.5 N

18. A girl on a bicycle hits a rock. The bicycle stops but she falls forward. Why? Inertia Force and Acceleration Action-Reaction None of the above.

N The box moves to the right with 66.2 N of force The box moves to the left with 38.8 N of force The box moves to the left with 52.5 N of force The box will not move N

20. What is the average speed of a car that travels 232 km in 4 hours? 56 km/hr 228 km/hr 60 km/hr 58 km/hr