1. Why are simple machines used? 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 1 9 8 7 6 5 4 3 2 0 Seconds Remaining:

3. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Remaining: Draw & Label the 3 types of levers

5. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Left: Describe mechanical advantage

7. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Left: – Why is the pulley considered a simple machine? – What changes can be made to the pulley system to make work easier?

9. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Left List the 6 types of simple machines

11. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Left: A construction worker tries to remove a nail from a board using a hammer and a crowbar. The construction worker is not able to pull a nail out of a board using a hammer. When the worker tries using a crowbar, the nail comes out easily. –Use what you know about the relationship between work, force, and distance to explain why it was easier to use the crowbar to remove the nail.

13. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Left: The drawing below shows a student using a screwdriver to open a paint can. – To change the force to the lid of the paint can, the student can reposition her hand. How does moving her hand change the force applied to the lid?

15. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Left: The drawing below shows a student using a screwdriver to open a paint can. – Describe how she could do this to apply less force to the screwdriver to remove the lid.

17. 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 9 8 7 6 5 4 3 2 1 0 Seconds Left: The drawing below shows a student using a screwdriver to open a paint can. – Explain clearly how moving her hand allows her to change the force .