Machines & Mechanical Systems TEST

Match the following terms with the correct definition.

• The part of a lever where work is put in.

• mechanical advantage

• Any slanted surface used to make work easier.

• output arm

• The part of a lever where the machine does the work.

• inclined plane

• The factor by which a simple machine multiplies the force put into it.

• input arm

The rate at which work is done is called (a)   .

• power

• efficiency

• work

Work output of a simple machine can never exceed the work _____ of that machine.

• efficiency

• input

• input

• efficiency

• energy

• output

• output

• energy

Match the following terms with the correct definition. Simple machines allow us to do the same amount of work, using a smaller force over a larger _______.

• load

• load

• power

• power

• distance

• effort

• effort

• distance

Match the following terms with the correct definition. To find the mechanical advantage of a pulley system, you must count the number of _____ ropes, except the one that has the input force.

• supporting

• output force

• pulley

• input force

• input force

• supporting

• output force

• pulley

15. Simple machines are unpowered devices used to make work (a)   .

• harder

• easier

• the same

• expensive

Which of the following is NOT considered a simple machine?

• Wheel and axle

• Electric motor

• Lever

• Block and tackle

Mechanical advantage can be defined as the ratio of:

• output work to input work

• output force to input force

A simple machine has an input force of 10 N and an output force of 100 N. What is the mechanical advantage of the simple machine?

• 1

• 10

• 90

• 1000

Which of the following block and tackle systems has the largest mechanical advantage?

• System A has the largest mechanical advantage.

• System B has the largest mechanical advantage.

• System C has the largest mechanical advantage.

• All three systems have the same mechanical advantage.