Ch. 14.3 - Mechanical Advantage and Efficiency

Ch. 14.3

Mechanical Advantage and Efficiency

Multiple Choice

Why is the actual mechanical advantage of a machine always less than its ideal mechanical advantage?

• The actual mechanical advantage takes into account friction

• The actual mechanical advantage doesn't take into account friction

• The actual mechanical advantage doesn't involve force

• The actual mechanical advantage is stronger than ideal mechanical advantage

Multiple Choice

Why can no machine be 100% efficient?

• Because machines always have flaws

• Because friction is always present

• Because of human error

• Because batteries run out of power

Multiple Choice

Which of the following is the correct equation to calculate efficiency?

• (Work Output/Work Input)

• (Input Distance/Output Distance) x 100%

• (Work Output/Work Input) x 100%

• (Input Force x Input Distance) x 100%

Open Ended

Suppose you are an inventor in 1900. You are constructing a bicycle of your own design. What could you do to ensure your bicycle efficiently changes the work input into forward motion?