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# Force

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### Force

1. 1. WHAT IS AFORCE?????
2. 2. A force is a push…..PUSH
3. 3. PULL… or a pull
4. 4. PULL
5. 5. FORCES NOT FORCESWeight MassMagnetism InertiaFriction SpeedGravity AccelerationThrust Velocity
6. 6. FRICTIONWhen an object moves in one direction, sliding past another object, friction moves it in the opposite direction!
7. 7. THRUSTThrust is a strongpush that quicklymoves an object
8. 8. Forces are measured inunits called Newtons (N) 100 N
9. 9. NET FORCE is the combining of ALL forces on an object•Each person is putting a force on the rope! •Combined, they have a net force!
10. 10. Forces moving in opposite directions are subtracted 20N 10NNET FORCE ON THE CAR = 10 N
11. 11. NET FORCE ON THE TOY = 15N
12. 12. Forces moving in thesame direction are added 12 N 12 N NET FORCE ON THE CAR = 24 N
13. 13. Newton’s 1 st Law of MotionObjects at rest remain at rest,objects in motion remain in motion withthe same speed and direction,unless acted on by an unbalanced force.
14. 14. What is a balanced force?
15. 15. BALANCED FORCES•All forces acting on an object areequal and opposite in direction.•Net force equals zero•Causes no change in motion of theobject
16. 16. 20 N 20 NBALANCED FORCES NET FORCE = 0N NO MOVEMENT!!!!!
17. 17. 20N 20NNET FORCE ON THE CAR= 0NTHERE WILL BE NO MOVEMENT!
18. 18. UNBALANCED FORCES•All forces acting on an objectare NOT equal•The net force will NOT be 0 N•There WILL be a change inmotion
19. 19. •The force of the boys pushing on the car, is greater than the force of friction. •The forces are unbalanced. 24 N FRICTION 4N What is the NET FORCE? Which direction will the car move?
20. 20. 10 N50 N
21. 21. Which way is thiscar going to move?100 N 10 N
22. 22. Objects at rest remain at rest untilacted on by unbalanced forces. The apple is at rest GRAVITY makes it fall
23. 23. The soccer ballremains at rest, until someone exerts thrust on it by kicking it.
24. 24. Objects in motion remain inmotion with constant speed andin the same direction, until acted on by an unbalanced force.
25. 25. INERTIA- An object’s resistanceto a change in its path of motionIN OTHER WORDS…INERTIA IS WHEN AN OBJECT DOES NOT WANT TO SPEED UP, SLOW DOWN, OR CHANGE DIRECTION!!!
26. 26. When the bike hits the rock, it will stop. INERTIA says the boy will resist a changein motion and keep moving. He goes flying over the handle bars
27. 27. The skateboarder is moving at aconstant speed and direction. He will eventually stop because of the force of friction acting on the wheels. FRICTION
28. 28. •The car is in motion, until acted on by the wall. •The wall has more force than the car, so it will be stopped
29. 29. The pitcherthrows a baseball in a certain pathway. The batter exerts a thrust on the ball with the bat, and the ball changes direction.
30. 30. When the baseball is hit by the batter, it flies inthe air. INERTIA says that it will stay moving in the same path at the same speed. GRAVITY forces the ball to change it’s path.
31. 31. This plane has a constant airspeed.•When a force •If a different force(THRUST) is acted (DRAG) is acted onon it, the airspeed it, the airspeed willwill increase, and decrease, and thethe plane will plane will slowaccelerate. down.