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Transcript
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 ā€œgā€)
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, [email protected]
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