Definitions
What is mass?
The amount particles in an object
What is the formula for calculating PE?
PE = m x g x h
Which has more Kinetic Energy, a ball moving at 3 m/s or 5 m/s?
5 m/s
In calculating PE, and KE energy problems, what unit is used for height?
meters
T or F Can energy ever disappear
False
What is velocity?
How fast an object is traveling.
Calculate the PE of a rock that has a mass of 60 kg and is 10 m high.
6000J
Determine the kinetic energy in a 7 kg ball thrown with a velocity of 21 m/s.
1543.5 Joules
In calculting PE and KE problems, what unit is mass?
Kilogram
Why do you come back down when you jump into the air?
Gravity!
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).
How much potential energy would a 3 kg table have if it's at the top of a hill 117 m high?
What is 3510J
The computer weighs 3 kg and is thrown at a velocity of 5 m/s. Calculate the Kinetic energy.
37.5 Joules
In calculating KE and PE problems, what unit is velocity?
m/s
List 3 forms of potential energy
Gravitational, chemical, elastic
What is gravity?
The force that pulls us towards the ground. 10 m/s2
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)
Calculate the kinetic energy of a 15 kg cart going 60 m/s.
27,000 J
What is the unit for Kinetic Energy?
Joules (or newton meter)
List 3 forms of kinetic energy.
electrical, light(electromagnetic), kinetic
What is height and how is it measured scientifically?
How high, or tall something is, measured in meters.
What is the PE of a 78 kg skater riding down a half pipe at a height of 6m?
4680m
Ms. Blake'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
What unit is used for Potential Energy?
Joules (or newton meter)
What is the law of conservation of energy?
Energy cannot be created nor destryoed, only changed in form.