MFE - How Machines Do Work

A machine is a device that allows work to be done

• easier.

• harder.

• with the same effort.

True or False: Machines reduce the amount of work done on an object.

• True

• False

The force exerted on the machine is the ______ _______, and the force the machine exerts on an object is called the _______ _______.

• output force, input force

• input force, output force

• greater force, lesser force

The input force multiplied by the input distance equals the

• input work.

• output work.

• work.

• power.

The output force multiplied by the output distance equals the

• input work.

• work.

• output work.

• power.

Tags

NGSS.MS-PS2-1

A machine can increase the __________ exerted, the ________ moved, or change an object's ____________.

• force, distance, direction.

• force, distance, area.

• force, distance, power.

What is mechanical advantage?

• the number of times a machine increases distance an object moves

• the number of times a machine increases a force exerted on it

• the number of times a machine increases the power of itself

Finding the ratio of input force to output force of a machine calculates the

• mechanical advantage.

• advantage.

• force advantage.

• power advantage.

The _________ of a machine compares the output work to the input work.

• efficiency

• force

• work

• shininess

Efficiency equals

• output work/input work

• output work/input work x 100%

• output work/input work x 110%

• output work/input work x 99%