Work, Work, Work, Work
Exciting Energy
Energy Transfers
Super Power(s)
Grab Bag
100

The unit for work.

Joules

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

100

Electric blanket

Electrical -> thermal


100

The amount of work done in a certain time is…

Power

100

Energy in motion is known as…

Kinetic energy

200

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

975 J

200

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

8 J

200

Windmill

Kinetic -> electrical

200

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

10 W or 10 J/s

200

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

51.16 J

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.

300

List the type of potential energy each object below has. 

A. Sandwich
B. Trampoline


A. Chemical potential energy

B. Elastic potential energy


300

Fireworks

Chemical -> radiant/thermal/sound


300

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

9 s

300

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

200 J

400

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

75 J

400

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

27 J

400

An apple falling off a tree limb

GPE -> kinetic


400

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

280 W

400

Define thermal energy and mechanical energy.

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

Mechanical energy = the sum of kinetic and potential energy in a system

500

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

7.67 m

500

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

2.55 kg

500

A man eating dinner, then tap dancing

Chemical -> kinetic -> sound/thermal

500

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

67.2 W

500

What is the mass of a ball that is rolling with a speed of 26 m/s and has 1,200 J of energy?

3.55 kg