1 The friction between a woman’s shoes and the roof she is standing on is called ____ friction.

2 Which of these is the weakest type of friction?

3 A lever lifts a 4 N box. It requires 2.5 N of effort. If the effort arm (length) is 6 meters and the resistance arm (length) is 3 meters, what is the actual mechanical advantage (AMA) of this lever?

4 What is the ideal mechanical advantage (IMA) of the lever in question in 3?

5 In order for a stationary box to slide across the floor which statement must be true?

6 Which arrow shows the direction of the frictional force?

7 Which of these does not effect the amount of friction between two objects?

8 Which direction will the box move?

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9 An object sitting still is pushed until it moves four meters. Which statement about the force to move it is correct?

10 Which of these has the least friction?

11 If A>C and B>D then the box will move ___.

12 How does ideal mechanical advantage differ from actual mechanical advantage?

13 What is the ideal mechanical advantage of this lever?

14 This material reduces friction.

15 Which of these machines will have the highest efficiency?