Simple machines and Mechanical advantage-1

A wheelbarrow is a good example of what class of lever?

• first class

• second class

• third class

A human arm is a good example of what class of lever?

• first class

• second class

• third class

Which of these items is a first class lever?

• scissors

• fishing rod

• tweezers

• none of these

A wedge has an output force of 25 N when given an input force of 5 N. What's the wedge's mechanical advantage?

• 0.2

• 5

• 20

• 30

A simple machine has an input force of 12 N and an output force of 4 N. What is its mechanical advantage?

• .33

• 3

• 8

• 16

The amount that input is magnified by a simple machine is known as the :

• mechanical advantage

• output force

• resistance

• none of these

The 3 parts of a lever are:

• fulcrum, effort, and load

• load, output, and input

• input, effort, and fulcrum

• pivot, output, and fulcrum

For a lever, AMA is calculated using measurements of the:

• forces

• distances

• the lengths of the effort and resistance arms

• the input and the output

The IMA (ideal mechanical advantage) formula of a lever is:

• output/input

• input/output

• distance of effort/ distance of resistance

• resistance arm length/effort arm length

A lever has an effort (input) arm length of 75 ft and an output (resistance) arm length of 25 ft. The actual mechanical advantage of this lever is:

• 3

• .33

• 1875

• not enough information to solve this