Energy

Work, Work, Work, Work, Work

100

The unit for work

Joules

200

You move a cart of pumpkins 15m.  This requires a force of 65N.  How much work was done while moving the pumpkin?

975J

300

The two conditions that must be met in order for work to be done.

1. The object must move.

2. Force must be applied in the direction of the motion.

400

A small child weighs 25N.  If they do a somersault and move a distance of 3m, how much work was done?

75J

500

How far did you push a 12kg barrel of tools if you did 276J of work and pushed at a rate of 3m/s²?

7.67m

Exciting Energy

100

In a race, two cars have the same mass but different velocities.  The car with the slower velocity has __________ kinetic energy than the other car does.

Less

200

How much energy does a 4 kg apple have that is thrown at a speed of 2m/s?

8J

300

List the type of potential energy each object below has.

A. Sandwich

B. Trampoline

A. Chemical

B. Elastic/Spring

400

How much potential energy does a bird have that weighs 9N and is sitting on a branch 3m high?

27J

500

What is the mass of a picture that falls off a shelf 6m high and has 150J of energy?

2.55kg

Energy Transfers

100

Electric Blanket

Electrical -> Thermal/heat

200

Windmill

Kinetic -> Electrical

300

Fireworks

Chemical -> Radiant/Light, Sound, Thermal

400

An apple falling off a tree limb.

Gravitational -> Kinetic

500

A man eating dinner, then tap dancing.

Chemical -> kinetic -> sound/thermal

Super Power(s)

100

The amount of work done in a certain time is ______

Power

200

How much power is used if 100J of work is done to move a box in 10s?

10W

300

How long would it take to do 36J of work if 4W of power are available?

9s

400

How much power is used if a force of 70N is used to push a box a distance of 20m in 5s?

280W

500

A motorcycle and its ride have a mass of 28kg.  If the motorcycle accelerates at 6m/s² during a 40m sprint in 100s, how much power did it have?

67.2W

Grab Bag

100

Energy in motion is known as _______

Kinetic Energy

200

A 0.9kg pineapple falls from a tree that is 5.8m tall.  How much energy does the pineapple have?

51.16J

300

How much heat is needed to warm 0.098 kg of gold from 15C to 30C if gold has a specific heat of 136J/kg*C?

200J

400

Define thermal energy and mechanical energy.

Thermal energy = the sum of the kinetic and potential energy of the particles in an object.

Mechanical energy = The sum of kinetic and potential energy in a system.

500

What is the mass of a ball that is rolling with a speed of 26m/s and has 1200J of energy?

3.55kg