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Definitions
Calculating PE
Calculating KE
Units
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100
What is mass?
The amount of space an object takes up. (Basically it's weight, but regardless of gravity).
100
What is the formula for calculating PE?
PE = m x g x h
100
Which has more Kinetic Energy, a ball moving at 3 m/s or 5 m/s?
5 m/s
100
In calculating PE, and KE energy problems, what unit is used for height?
meters
100
What is energy?
The ability to do work.
200
What is velocity?
Speed in a specific direction
200
Calculate the PE of a rock that has a mass of 60 kg and is 10 m high.
5880 J
200
Determine the kinetic energy in a 7 kg ball thworn with a velocity of 21 m/s.
1543.5 Joules
200
In calculting PE and KE problems, what unit is mass?
Kilogram
200
Why do you come back down when you jump into the air?
Gravity!
300
What is the difference between kinetic energy and potential energy?
Kinetic energy is motion. Potential energy is stored energy due to it's position (height), condition, or chemical composition.
300
How much potential energy would a 3 kg table have if it's at the top of a hill 117 m high?
What is 3439.8 J
300
The computer weighs 3 kg and is thrown at a velocity of 5 m/s. Calculate the Kinetic energy.
37.5 Joules
300
In calculating KE and PE problems, what unit is velocity?
m/s
300
List 3 types of potential energy
Gravitational, elastic, chemical, mechanical
400
What is gravity?
The force that pulls us towards the ground. 9.8 m/s^2
400
Which has more potential energy, a calculator on the ground or a calculator on the table 1.5 m high?
on the table. (greater height)
400
Calculate the kinetic energy of a 15 kg cart going 60 m/s.
27,000 J
400
What is the unit for Kinetic Energy?
Joules (or newton meter)
400
List examples of someone using kinetic energy.
Throwing a ball, Kicking a ball, Hitting a ball. Moving a cart, etc...
500
What is height and how is it measured scientifically?
How high something is off of the ground or tall something is, measured in meters.
500
Why might there be more Potential Energy at the top of a rollercoaster than at the end of the ride?
Potential Energy decreases as Kinetic Energy Increases.
500
Ms. Celetti's pencil weighs 0.05 kg and is dropped from the table 1 m high. The pencil falls at a velocity of 9.8 m/s. What is the pencil's KE?
2.401 J
500
What unit is used for Potential Energy?
Joules (or newton meter)
500
What is the law of conservation of energy?
Energy cannot be created nor destryoed, only changed in form.