1. Forces and Motion Review

2. Sum of Forces
What is the Equation for the Sum of Forces?

3. Answer
Applied force – friction force = Sum of forces

4. Sum of forces
I have a applied force of 723N to the left and a friction force of 540N.
What is the sum of forces?

5. Answer
723N – 540N = 183N to the left

6. Forces
Forces have __________________ and ________________________.

7. Answer
Forces have direction and magnitude.

8. Equal or unequal force?
50 N
50 N

9. Answer
Equal force-If the forces are equal then the sum of forces will be 0. The object won’t move.

10. Equal or unequal
150N
50 N

11. Answer
Unequal-The force to the left is bigger then the force to the right.

12. Friction
. __________ friction occurs when a body is forced to move along a surface but movement has not started yet.

13. Answer
Static friction

14. Friction
. ___________ friction occurs when the applied force is greater than the frictional force. This causes the object to move along the surface.

15. Answer
Sliding friction

16. Friction
___________ friction is a combination of frictional forces at the point of contact with the wheel and the ground/surface of a rolling object

17. Answer
Rolling Friction

18. Distance vs time Which line represents the fastest speed? miles
Minutes

19. Answer
Line c-d has movement of 9 miles in 4 minutes

20. Distance vs. time
What line has a slope of 0?
What does that mean?

21. Answer
Line b-c has a slope of 0 and it means that they are not moving. Time is passing but the distance is not changing.

22. _______________________force is the support force exerted upon an object that is in contact with another stable object.

23. Anwser
Normal force

24. A kid is pushing a box across a room at a constant velocity in a rightward direction. Draw a force diagram.

25. A student flicks a paper football across the table in a leftward direction and leftward acceleration. Draw a force diagram.

26. Create a story that has at least 4 different events (lines)
Create a story that has at least 4 different events (lines). Then graph it on the back. Make sure your graph is labeled