The force produced when two objects rub against each other is called __________.

A. gravity

B. recoil

C. magnetism

D. friction

What mechanical advantage does the block and tackle arrangement in the above figure give?

A. 1

B. 3

C. 2

D. 4

The mechanical advantage of two meshing gears is calculated by dividing __________.

A. the number of teeth on the driving gear by the number of teeth on the driven gear.

B. the number of teeth on the driven gear by the number of teeth on the driving gear.

C. the number of teeth on the driving gear by the rotational speed.

D. the diameter of the driven gear by the number of teeth on the driving gear.

When meshing or interlocking gears have different numbers of teeth, __________.

A. relative speeds depend on the speed of the drive aide for both

B. both gears will rotate at the same speed

C. the gear with more teeth will rotate fester than the gear with fewer teeth

D. the gear with fewer teeth will rotate fester than the gear with more teeth

Which of the other gears is moving in the opposite direction from Gear 1?

A. Gear 2

B. Gear 3

C. Both Gears 2 and 3

D. Neither Gear 2 or 3

Which mechanical components are typically used between a wheel and an axle to reduce friction?

A. springs

B. hinges

C. bearings

D. levers

Which term below best describes the OPPOSITE of an increase in speed?

A. rotation

B. deceleration

C. friction

D. velocity

The sprocket on a bicycle is most similar to which of the simple mechanical devices listed below?

A. a gear

B. a spring

C. a lever

D. all of the above

What is Newton's Third Law of Motion?

A. What goes up must come down.

B. For every action, there is an equal and opposite reaction.

C. Reactions are a result of large actions.

D. Mass cannot be destroyed.

Which of the following statements is true for water flowing from a 4-inch pipe to a smaller 2-inch pipe?

A. The same amount of water passes through both the 4-inch pipe and the 2-inch pipe.

B. The pressure is greater in the 2-inch pipe.

C. More water passes through the 4-inch pipe than through the 2-inch pipe.

D. The pressure is lower in the 4-inch pipe.