1. Work, Force and Motion

2. Work and Forces

3. Force
a push or a pull on an object
push = away; pull = toward
has size and direction
changes speed and direction
Force (F) is measured in newtons (N)

4. ÷ F D W X Work - a force moving an object over a distance.
Work is done ONLY if an object moves in the direction of the force
Work (W) is measured in joules (J)
Force (F) is measured in newtons (N) W F D ÷ X

5. Do all forces result in motion?
Can you see all forces acting on an object?
Can more than one force act on an object at the same time?

8. Net force - the combination of all the forces acting on an object
When forces on an object produce a net force of 0 N, the forces are balanced and the object does not move
When the net force on an object is not 0 N, the forces on the object are unbalanced
Unbalanced forces produce a change in motion of an object

9. Balanced Forces
Balanced Forces- When the forces on an object produce a net force 0N
Will not cause a change in motion of a moving object
Does not cause a non-moving object to move

10. Unbalanced Forces When the net force on a object is not 0N
the forces are unbalanced
Produce a change in motion

11. Forces in Different Directions

14. The forces acting on the object can be balanced or unbalanced
If they are unbalanced their will a change in the objects motion. How will this objects speed change?
Find the Net force acting on the object.
10 N
5 N

15. Find the Net force acting on the object.

16. Find the Net force acting on the object.
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Are the forces balanced or unbalanced?
10 N 12 N