Work
True of false: riding a bike up a hill would be an example of work.
True
The amount of work you do within a given period of time is called...?
Power
kinetic
What are the 3 different classes of levers?
- First class
- Second class
- Third class
What is a wheel with a rope, chain, or belt around it.
Pulley
Work = force X ___________?
Acceleration
Power = Work / ___________?
Time
Stored energy is an example of what? (kinetic or potential)
potential
Scissors are an example of a first, second, or third class lever?
First
What is a simple machine made of a ramp?
Inclined plane
True or false: A person staring at a screen studying is doing work.
False
The unit for measuring power is the...
Watt
Which one is not an example of one of the 6 main forms of energy?
Chemical energy
Heat energy
Healing energy
Healing energy
The fixed point of a lever is called
fulcrum
What is is an inclined plane that moves when it is used (example: an axe)?
A wedge
What is the metric unit for work?
Joule
If you did 100 joules of work in 10 seconds. What would the power be?
100 / 10 = 10
Power = 10 Watts
A bowling ball rolling down the lane is an example of what type of energy? (kinetic or potential?)
kinetic
The force applied to a machine is called?
Effort Force
What is a straight piece of metal with an inclined plane wrapped in a spiral around it.
A screw
Suppose a man is pushing a wheelbarrow. He uses a force of 5 newtons and pushes the wheelbarrow a distance of 2 meters. How much work does she do?
5 X 2 = 10
Work = 10 Joules
Suppose you did 250 joules of work in 5 seconds. What would the power be?
250 / 5 = 50 Watts
Which law states that energy cannot be created or destroyed?
law of conservation of energy
The amount of work a person puts into a machine is called the...?
Work input
Name the 5 types of simple machines we learned about in chapter 6.
- Pully
- Inclined plane
- Screw
- Wedge
- Wheel / Axle