Misc.
Calculating PE
Calculating KE
Units
Random
100

What is Energy?

Energy is the ability to make something move or change. 

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

Potential and kinetic are forms of what?

Energy. 

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 thrown 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).
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

Can an object have both kinetic and potential energy at the same time? 

Yes. 

400

What is the definition of a system? 

a system is a set of interacting parts forming a complex whole. 

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 3 forms of kinetic energy.
Motion (mechanical), heat (thermal), sound, light (radiant), electrical
500

What is a joule in terms of units. 

(Kg*m^2)/(S^2)

500

Why might there be (slightly) more Potential Energy at the top of a rollercoaster than the total amount of energy at the very end of the ride?

Some energy is lost due to friction, heat, and wind.

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.
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