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Forces & Motion Study Guide Answers 1. Distance = 200m , Displacement = 120 m so distance is greater 2. instantaneous 3. Speed is distance divided time velocity is speed with direction 4. Velocity is a vector so if direction changes velocity changes 5. Mass 6. Inertia 7. change, continue, constant 8. Air resistance 9. zero acceleration, steady speed 10. 9.8 m/s2 (represented by āgā) 11. force that keeps an object moving in a circle 12. Distance and Mass 13. Acceleration is directly related to force and inversely related to mass, 2nd Law 14. You exert a force on the ground it exerts a force on you 15. Law of conservation of momentum 16. F=MA so 30N = (m) 5 m/s2 30 N / 5 m/s2 = 6kg 17. When velocity and or direction changes (speeding up, slowing down, turning@ constant speed or velocity) 18. A boat moving through the water because of the rowing motion 3 A ball hits the floor & bounces up 3 It takes more force to accelerate a bowling gall than a soccer ball 2 Dishes remain on the table after you pull the table cloth out from under them 1 A paddle is used to propel a canoe through the water 3 When a toy balloon is blown up and released it will fly violently around the room 3 19. s =d/t so 10km /5 mins= 2km/min 20. a = vf -vi/t so (9m/s - 3m/s) / 3s = 2 m/s2 21. p=mv so (2 kg)( 10 m/s) = 20kgm/s 22. F=MA so 1000 kg (9.8 m/s2 )= 9800N 23. weight is the gravitational force exerted on an object, it changes depending on location, ex. Moon has less gravitational pull so weight is less 24. No they could be going at a constant velocity (objects in motion will stay in motion 1st law) 25. A safety belt prevents you from continuing to move forward at the same speed the car as traveling in the event of a sudden stop. It provides the unbalanced force to stop your motion. 26. Backward thrust, 1st Law 27. Distance divided by time (or speed) 28. 4 m/s 29. more, 2nd 30. Yes, it can be moving at a constant velocity in a straight line or it can be at rest *Centripetal force means center seeking force, keeps object moving in a circle