Work and Power

Work/Power Math

Machines

Simple Machines

Math

100

The SI units for work and power

What is a Joule and a Watt?

100

The amount of work done to lift a 2 N book 5 m.

What is 10 J

100

A machine can make work easier by __________________ the force applied to an object.

What is increasing?

100

An ax is this type of simple machine

What is a wedge

100

Convert half an hour to seconds

What is 1800?

200

In order for work to be done, these two conditions must happen

1. Object must move due to force

2. Must move in the direction that force is applied

200

The distance a rock was lifted if a 150 N force was applied, with 300 J of work done.

What is 2 m

200

The force applied to the machine.

What is the input force?

200

A rake is this type of simple machine.

What is a lever?

200

How many horsepower is 4476 watts?

What is 6 hp?

300

The formula for Power

P = W/t or P = (Fxd)/t

300

It is the power of a blender that can perform 4,125 J of work in 22 s.

What is 187.5 Watts?

300

True or false. When you use a ramp you do more work than if you lift the box straight up.

What is false?

300

Stairs are this type of simple machine. Egyptians would use these.

What is an inclined plane?

300

352,000,000 in Scientific Notation

What is 3.52 x 10^{8} ?

400

The rate of work or the amount of work done in one second

What is power?

400

I have a 1,700 W microwave, it runs for 8 min, how much work is done.

What is 816,000 J

400

By doing this you can make a machine more efficient.

What is reducing friction?

400

A jar lid is this type of simple machine.

What is a screw?

400

To open a paint can your input force is 18N and the out put force is 9 N. The Mechanical advantage is

What is .5?

500

One Joule of work done in one second

What is a watt?

500

How much work is done if you push with 8,750 N of force and the tractor does not move

What is 0 J

500

Using an ax your downward force is changed to a ___________________ force.

What is horizontal?

500

Scissors are this type of simple machine.

What is a lever?

500

You apply a horizontal force of 10.0 N to pull a wheeled suitcase at a constant speed of 0.5 m/s across flat ground. How much power is used?

*(Hint: The suitcase moves 0.5 m/s. Consider how much work the force does each second and how work is related to power.)*

What is 5 W?