1. Forces and Motion

2. Five Forces Studied 1. Push 2. Pull 3. Gravity 4. Magnetism
5. Friction

3. Force: a push or a pull Forces and Motion
The amount of force you have to use to move an object depends on its mass.
Which requires more force? or
Bowling ball

4. Gravity: force that pulls objects toward each other
Why when you drop something does it always fall down?
Gravity: force that pulls objects
toward each other
The more mass two objects have, the more gravity pulls them toward each other. Earth has more mass than the moon and so the gravity is stronger on earth.
Weight: measure of the pull of gravity on an object

5. Magnetism Opposite poles (north and south) attract pull
Iron and Steel are attracted to magnets
Like poles (south and south or north and north) repel

6. Friction is a force!
Friction is a force that occurs when 2 surfaces oppose each other.

7. Remember the activity of the same ramp, same marble however the floor types are different. Why did the marble travel different distances????
Friction – wood and tile are smoother and thus have less friction and will then allow the marble to travel farther. The carpet is rougher and has more friction, and slows down the marble faster.

8. Friction can be …. Keep wheels on the road. Applying brakes
Rubbing hands together

9. Motion: a change in position
Every motion is started by a force and every motion is stopped by a force. A force can also change the position of an object.
Change the direction of a ball by applying another force on the ball.

10. Equal or Balanced Forces
Not all forces stop or start a motion. If one student is pushing on one end of a box and another student is pushing on the opposite end of a box, the forces are balanced and the box doesn’t move. There is no motion.
Equal or Balanced Forces

11. Speed: Measure of how fast something moves over a certain distance.
To calculate speed: Speed = distance you went/ time it takes to get there

12. Work: measure of force it takes to move an object a certain distance
Work = force needed to move object (newtons) a certain distance
Pushing against a wall is NOT work.

13. The amount of matter that an object has.
Mass

14. A measure of the amount of force needed to move an object a certain distance.
Work

15. A tool used for measuring mass.
Balance

16. A measure of how fast something moves over a distance.
Speed

17. Any push or pull
Force

18. Equal forces on an object that cancel out
Balanced Forces

19. A device used for measuring weight and force need to move an object.
Spring Scale

20. A change in the position or place of something
Motion

21. A force that pulls objects toward the Earth.
Gravity

22. The location of that place or object
Position

23. A force - rubbing of one object against another
Friction

24. The measure of the force of gravity on an object.
Weight

25. The natural force produced by a magnetic field.
Magnetism

26. A unit that is a measure of force.
Newton

27. Forces that are not equal in size and direction
Unbalanced Forces