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Definitions and more
Calculating PE
Calculating KE
Units
Miscellaneous
100
True or false: a ball on the ground has more potential energy than a ball on a hill.
False
100

What is the formula for calculating PE?

PE = mass x gravity x height

100

Which has more Kinetic Energy, a ball moving at 3 m/s or 5 m/s? Why?

5 m/s because it has a higher velocity

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

If friction is present, what type of energy does kinetic energy transform into?

thermal energy

200

Calculate the PE of a rock that has a mass of 60 kg and is 10 m high. Include Units.

5880 J

200

Determine the kinetic energy in a 7 kg ball thrown with a velocity of 20 m/s. Include units.

1400 Joules

200
In calculting PE and KE problems, what unit is mass?
Kilograms
200
Potential or kinetic: A parachutist about to jump.
Potential
300
What is the difference between kinetic energy and potential energy?
Kinetic energy is energy of motion. Potential energy is stored energy due to an object's position (height).
300

How much potential energy would a 3 kg table have if it's at the top of a hill 110 m high? Include units.

What is 3234 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 2 forms of potential energy.

Chemical, nuclear

400

What is gravity always on Earth?

 On Earth, gravity is always 9.8 N/kg

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
400

List 3 forms of kinetic energy.

Motion (mechanical), heat (thermal), sound, light (radiant), electrical

500

If an object has no height, what is its potential energy? Include units!

0 J

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 transformed to thermal (heat) and sound.

500

Ms. Krieger's book weighs 5 kg and is dropped from the table 2 meters high. The book falls at a velocity of 10 m/s. What is the book's KE?

250 J

500
What unit is used for Potential Energy?
Joules
500

What is the law of conservation of energy?

Energy cannot be created nor destryoed, only changed in form.