Kinetic Energy
What is the sum of the potential energy and the kinetic energy in a system?
What is mechanical energy?
A guy is walking his dog. He then stops at a stop sign. What type of OVERALL energy does he have? (potential or mechanical)
What is mechanical energy?
Why does an object have potential energy?
What is it is due to its position and its mass?
When you increase the mass of an object, what happens to the kinetic energy?
The Kinetic Energy increases also, by the SAME factor
What is kinetic energy?
What can you do to a bucket of water that is on a bench to decrease its potential energy?
To decrease the potential energy of a bucket of water, you could:
- let some water OUT of the bucket.
- put the bucket on the ground instead of the bench.
How do you calculate gravitational potential energy or GPE?
What is GPE= height x mass x gravitational acceleration
h x m x g = ____ Joules
The law of conservation of energy states that...
that energy can never be created or destroyed but it is ALWAYS changing from one to the other.
Two cars are perched at the top of a hill. One car has a mass of 250 kg and the other has a mass of 150 kg. Which car has the most potential energy and why?
The car that is 250 kg has the most potential energy because it has more mass than the other car.
Give a real-life example of something having gravitational potential energy.
A roller coaster on top of a hill.
A ball on the edge of a table.
A meteor or asteroid.
The Tower of Doom
What is work?
When energy is transferred to another object.
In a basketball game, describe when there is a moment of potential energy.
When a player is about to shoot a free throw.
When the ball is held above the two center players at the beginning of the game.
When a ball is about to be thrown into the court.
If the ball gets stuck on the rim.
If a truck is moving at a SPEED of 5 m/s, what is its Kinetic Energy?
What is KE= 25 Joules? (KE will increase by the square of the original speed)
Give a real-life example of elastic potential energy.
coiled spring
rubber band
bungee jump
archery
etc...
ALL energy can be measured in what unit? Give the name and the abbreviation.
Joules, J
Explain how swinging on a swing demonstrates the Law of Conservation of Energy.
In that system, the potential energy that starts the movement of the swing converts (or changes into) kinetic energy and it keeps going back in forth until the energy is lost to the environment and the swing stops.