The relationship between velocity and kinetic energy
What is 1/2 mass x velocity squared
100
The formula for potential energy is
What is mgh
100
Simple machines will change the direction or magnitude of what?
What is force
100
Work requires what two things?
What is force and displacement
100
You use 20 N of force pulling on a tree that does no move. How much work have you done?
What is none.
200
A 30 kg boy runs 2 km in 2 minutes. What is his kinetic energy?
What is 4167 J
200
A 3 kg book sitting on a shelf that is 1.5 m high has how much potential energy
What is 44.1 J
200
what type of simple machine is a wheelbarrow
What is a lever
200
How much work is required to lift a 12 kg bucket 10 m in the air?
What is 1176 J
200
This turns kinetic energy into heat energy
What is friction
300
A car on top of a 14 m high hill with a speed of 12 m/s goes to the bottom of the hill. What will be its speed at the bottom?
What is 20.4 m/s
300
Potential energy is what stops motion
What is friction
300
A machine will lessen the work
What is that is not what a simple machine does
300
How much work was required to move a beached whale using a constant force of 1000 N to the water which is 20 m away?
What is 20,000 J
300
How much power is produced when a 5 kg bag of potatoes is lifted 2 m in 0.3 seconds?
What is 327 watts
400
How much work is done on a 1200 kg boat that goes from 30 m/s to 15 m/s. Answer in kJ
What is 405 kJ
400
A spring stretches 15 cm while suspending a 50 kg bag of apples. What is the spring's potential energy?
What is 36.75
400
A wedge's efficiency is 98%. The work in is 100 J. What is the work out?
What is 98 J
400
How much work is done by a girl pulling on a rope at a 30 degree angle attached to a 23 kg crate with a constant force of 50 N for 5 m across the room?
What is 217 J
400
It took 90,000 J to heat up 2 kg of water to 110 degrees. What was the initial temperature? ( Cp= 4180 J/ kg x C)