2. a. Let ten of their friends throw the glider one time each b. Choose one friend to throw the glider many times c. Throw the glider just once d. Estimate how far the new glider will fly

3. a. A push or pull that changes an object’s motion b. A push or pull that speeds up an object c. A push or pull that brings an object to rest d. A push or pull that slows down an object

4. a. 30 kgb. 5 kg B. c. 10 kgD. 100 kg

5. a.Gravity b.Magnetic c.Thermal d.inertia

6. a. The wedge is stronger than the hammer. b. The shape of the wedge focuses the force of the blow. c. The wedge is longer than it is wide. d. The wedge is made of harder material than the hammer.

7. a.Gravity b.Magnetism c.Inertia d.friction

8. a. They increase the amount of energy. b.They reduce friction on moving objects. c.They increase the momentum of moving objects. d.They increase the momentum of moving objects.

9. a.The canoe will move toward the dock and then stop. b.The canoe will stay still. c.The canoe will move away from the dock. d.The canoe will move toward the dock and hit it.

10. a.Change the direction of motion of an object. b.Need a source of energy to work. c.Change the speed of a moving object. d.Increase the amount of force.

11. a. Friction b. Inertia c. Heat d. magnetism

12. a.The wax will decrease the inertia of the skis. b.The wax will decrease the friction of the skis. c.The wax will increase the gravity of the skis. d.The was will decrease the momentum of the skis.

13. What could be done to balance the forces on the two sides of the pulley? a. Pull on the rope until the 3 kg mass is twice as far below the pulley as the 6 kg mass. b. Add 3 kg of mass to the side of the pulley which already has a 3 kg mass. c. Pull on the rope until the 3 kg mass and the 6 kg mass are the same distance from the pulley. d. Pull on the rope until the 6 kg mass is twice as far below the pulley as the 3 kg mass. 6 kg 3 kg

14. a. The forces acting on him are unbalanced. b. The forces acting on him are balanced. c. The only force acting on him is gravity. d. Inertia is causing his speed to increase. http://www.youtube.com/watch?v=-FA9f-4n2ME

15. a. Friction. b. Inertia. c. Gravity. d. Resistance.

16. a. There is more gravity from the sand. b. There is more friction when the sand is on the sidewalk. c. There is more heat from the sand. d. There is more inertia from the sand.

17. a. The smooth wooden floor has less mass. b. The smooth wooden floor has less gravity. c. The smooth wooden floor has less inertia. d. The smooth wooden floor has less friction.

18. a. Standing still. b. Moving at a constant speed. c. Changing speed or changing direction d. Rotating about an axis.

19. a.A basketball rolling on the floor and hitting the wall b.A basketball falling to the floor when a player lets go of it. c.A basketball being thrown to another player. d.A basketball rebounding off the rim of the basket.

20. a.b. c.d.

21. a.Lift a car engine b.Cut a steak c.Hold a piece of wood together d.Trim bushes and plants

22. Which type of simple machine is the bottom of the bulb? A lever B pulley C screw D wedge

23. A It will stay in place between the two people. B It will move toward the right. C It will move toward the left. D It will fall to the ground.

24. Time (s) Distance (m) When does the animal remain still? A between second 1 and second 2 B between second 2 and second 3 C between second 3 and second 4 D between second 4 and second 5

25. A The force of gravity must be greater than the mass of the object. B The mass of the object must be greater than the force of gravity. C The force of gravity must be greater than the upward pull or push on the object. D The upward pull or push on the object must be greater than the force of gravity.

26. What would be most responsible for the toy car being pulled up the ramp? A friction B gravity C kinetic energy D momentum

27. A the density of the rock B the pull of gravity on the rock C the inertia of the rock D the momentum of the rock

28. Seconds Meters What could this graph describe? A friction B volume C mass D speed

29. A friction B gravity C heat D momentum

30. A The car is keeping the same direction. B The car is maintaining the same speed. C The car is increasing speed. D The car is changing direction.

31. A The object will speed up. B The object will change direction. C The object will continue moving at a constant speed. D The object will slow down and eventually stop moving.

32. A The friction between the box and the floor decreases when it is pushed. B The pull of gravity on the box decreases when it is pushed. C Unbalanced forces cause the box to move. D Balanced forces cause the box to move.

33. A the length of the boat B the shape of the boat C the power of the boat D the weight of the boat

34. Box 2 1 kg Box 1 50 kg Rope Pulley What will happen in this situation? A Box 1 will move up, and Box 2 will move down. B Box 1 will move down, and Box 2 will move up. C Both boxes will not move. D Both boxes will move down.

35. A 0.5 hour B 1 hour C 1.5 hours D 2 hours

36. A The sand increases friction between the road and the tires of a car. B The sand increases the inertia of a car. C The sand increases the speed of a car. D The sand increases the momentum of a car.

37. A It is moved by balanced forces. B It is moved by two opposite forces. C It is moved by an unbalanced force. D It is moved by a force without direction.

38. A wheel and axle B inclined plane C pulley D wedge

39. 0 sec1 sec 2 sec 3 sec Which best describes the motion of the ball? A getting faster each second B getting slower each second C maintaining the same motion D constantly changing direction

40. A The dog slows down. B The dog comes to a stop. C The dog changes in mass. D The dog changes direction.

41. A electricity B gravity C light D heat

42. A The force of gravity must be equal to the force of the wind. B The force of gravity must be greater than the force of the wind. C The force of the wind must be greater than the force of gravity. D The force of the person flying the kite must be equal to the force of the wind.

43. A to overcome gravity B to stop easier C to reduce air resistance D to keep the engine cool

44. http://www.youtube.com/watch?v=grWIC9VsFY4&featur e=related