Work
What is the formula for work?
W = F x d
What is power?
The rate of doing work OR P = W/t
List 4 simple machines
Lever, pulley, wedge, screw, inclined plane, wheel and axle.
What type of energy is stored when an object is at rest?
Potential energy
What is the largest animal on Earth?
Blue whale
How much work is done when a 60 N force moves an object 6 m?
360J
What is the unit of power?
Watts
In a lever, what is the pivot point called?
Fulcrum
What is the unit of electric current?
Amp
What country has the most population?
India
If you push a wall with a force but it doesn’t move, how much work is done?
0J
A machine does 200 J of work in 10 seconds. What is its power?
20W
What simple machine is a doorknob?
Wheel and axle
🐶 + 🐶 + 🐶 = 21
🐶 + 🐱 = 11
Final image shows:
🐶 × 🐱 − 🐶 = ?
21
What is the most common letter in English?
E
A 5 N force does 40 J of work. How far did the object move?
8m
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.
Does a simple machine reduce the total amount of work done?
No
Which color of visible light has the highest energy?
Violet
What is the opposite of nocturnal?
Diurnal
Ben uses 50 watts of power to complete a task that takes 1.5 minutes. How much work is done?
4500J
Why is it often faster (but harder) to lift an object straight up rather than using a ramp?
Lifting straight up
Using a ramp
Why are lightning bolts seen before thunder is heard?
Light is faster than sound
What is the main language spoken in Brazil?
Portuguese