Power, Work, Machines

Work

100

What is the formula for work?

W = F x d

200

How much work is done when a 60 N force moves an object 6 m?

360J

300

If you push a wall with a force but it doesn’t move, how much work is done?

0J

400

A 5 N force does 40 J of work. How far did the object move?

8m

Power

100

What is power?

The rate of doing work OR P = W/t

200

What is the unit of power?

Watts

300

A machine does 200 J of work in 10 seconds. What is its power?

20W

400

Is it possible to have high power but low work? 

Yes, even if the work is small, if it happens in a very short time, the power can still be high.

500

Ben uses 50 watts of power to complete a task that takes 1.5 minutes. How much work is done?

4500J

Simple machines

100

List 4 simple machines

Lever, pulley, wedge, screw, inclined plane, wheel and axle. 

200

In a lever, what is the pivot point called?

Fulcrum

300

What simple machine is a doorknob?

Wheel and axle

400

Does a simple machine reduce the total amount of work done? 

No

500

Why is it often faster (but harder) to lift an object straight up rather than using a ramp?

 Lifting straight up

• Distance: Short (just the vertical height)
• Force: Large (you must lift the full weight)

Using a ramp 

• Distance: Longer (you travel along the ramp)
• Force: Smaller (less force needed)

Physics trivia

100

What type of energy is stored when an object is at rest?

Potential energy

200

What is the unit of electric current?

Amp

300

🐶 + 🐶 + 🐶 = 21
🐶 + 🐱 = 11

Final image shows:
🐶 × 🐱 − 🐶 = ?

21

400

Which color of visible light has the highest energy?

Violet

500

Why are lightning bolts seen before thunder is heard?

Light is faster than sound

Random Trivia

100

What is the largest animal on Earth?

Blue whale

200

What country has the most population?

India

300

What is the most common letter in English?

E

400

What is the opposite of nocturnal?

Diurnal

500

What is the main language spoken in Brazil?

Portuguese