Pre-test: Forces & Dynamics

1. Which type of force is a non-contact force? Applied Force Friction Normal Force Weight 2-3. Click on the correct term in the sentance Compression Force - pushing forceTension Force - pulling force 4-7. Match the types of forces to the letter choice: A Thrust Force B Drag Friction C Lift Resistance D Gravitational Force 8-9. SELECT THE TWO STATEMENTS: Which statements are TRUE about friction? The direction of friction is opposite the motion of the object The direction of friction is in the same direction as the motion of the object The magnitude of Kinetic Friction is MORE than Static Friction The magnitude of Kinetic Friction is LESS than Static Friction 10. Which arrow represents the direction of a normal force? A B C 11. A big tractor pulls a box with a force of 400N to the left. A small tractor pulls that same box with a force of 200N to the right. What is the net force on the box and what direction will it move? net force is 600 Nthe box will not move net force is 200 Nthe box will move to the right net force is 200 Nthe box will move to the left. net force is 600 Nthe box will move to the left 12. In the diagram 2 people are pushing books. What is the net force being applied to the books? 25 N to the left 5 N to the right 5 N to the left zero, the forces are balanced 13-20. Sort the statements into the following categories: Balanced Forces Net force = 0 N Force pairs are equal in magnitude, but in the opposite direction At rest Constant speed in one direction Unbalanced Force Net force > 0 N Force pairs are not equal in magnitude Changing speed Changing direction 21-23. Assume that all objects are moving. What will be the motion of the object after the forces represented by the force diagram? slow down speed up constant speed 24. Which object resists changes in motion more? a tugboat the Titanic 25. What is the acceleration of the object? 0 m 0.1 m the left 10 m the left 900 m the left 26. What is the acceleration of the object? 0 m 0.25 m the left 25 m the left 50 m the left 31. Consider a fish swimming forward in the ocean. Which of the following describes the basic action forces between the fish and the water? The force of the fish points back while the force of the water points forward. The force of the fish points forward while the force of the water points back. The force of the fish points upward while the force of the water pulls downward. The forces point in the same direction because forces in liquid media behave differently than forces in air. 32. TRUE or FALSE: earth and a ball exert equal forces on one another, but they respond differently due to their difference in mass. true false 33. TRUE or FALSE: two objects with different masses will fall from the same starting height and hit the ground at the same time. This phenomena is because they exert equal forces on Earth. true false