3rd quarter review - 2012

Why can’t you ever be truly weightless? You are never away from gravity You are never without weight.

2. What two things determine the amount of gravity experienced between an object and a planet?

3. I take a ball with a mass of 50 grams to the moon. Does the mass change? Does the weight change?

What is the average speed between 0-25 minutes? 4. What is the average speed between 0-25 minutes?

5. If I was driving to the beach for the weekend, if I drove 300 miles in three hours, what was my average speed?

6. What does a fixed pulley change, direction or force?

7. What does an incline plane do, change force or direction?

8. Does an inclined plane increase or decrease input force?

9. Which of the following are examples of an inclined plane. a 9. Which of the following are examples of an inclined plane? a. a spiral staircase b. a knife c. a wheelchair ramp d. a screw

What kind of screw has the best mechanical advantage? long or short threads? tightly or loosely coiled?

11. Which changes with location: weight or mass?

12. You drop a golf ball, tennis ball and cannon ball of the roof, which hits first?

13. A van and a sports car hit a wall going 50 mph 13. A van and a sports car hit a wall going 50 mph. Which hits with the greatest force?

14. A bus and a compact car are going down the hill, which has more force? Why?

15. Which has the greatest gravitational attraction? B.

16. Which of the following compound machines contains the most simple machines: A can opener An axe A wheelchair A wagon

17. Name all the simple machines in a pair of nail clippers.

18. How is friction involved when you stop a bicycle?

19.What allows a cart to keep moving even after you stop pushing it?

20. What type of measurement is 50 meters/second north?

21. What type of measurement is 50 meters/second?

22. What type of measurement is 50 meters?

23. Time (hr) Velocity (km/hr) Start 1.0 40 2.0 60 3.0 50 4.0 Between what two points in this data chart is acceleration the greatest?

24. You are walking toward the lunch table when you have to stop quickly because Ms. Peltz runs in front of you. What keeps your food on the plate?

25. Name three forces.

26. How do simple machines make work easier?

27. Who had more power, Marcella who picked up three books three feet off the floor in five seconds or Brianna who picked up three books three feet off the floor in three seconds?

28. Who is doing work? Mark pushing a wall or Seline pulling a wagon.

29. What happens to gravity as the distance between two objects decreases?

30. Draw a sketch of a car with increasing acceleration.

When did the runner go the fastest? C B A

If speed doesn’t change and you don’t change direction, then Velocity doesn’t change Acceleration is zero Speed is constant All the above.