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Energy Basics
Kinetic Energy
Potential Energy
Conservation of Energy
Forms of Energy
100
Name 3 forms of energy
-Mechanical (Kinetic, Elastic and Gravitational Potential) -Thermal -Chemical -Nuclear -Electrical -Radiant
100
Kinetic energy is also known as the energy of___________
Motion
100
Potential energy is also known as the energy of _________
Position
100
A tennis ball rolls up a hill at an initial speed of 4m/s. It comes to a stop after 2s. What happens to the kinetic energy as the ball rolls?
Decreases
100
Identify an example of kinetic energy
Anything in motion
200
A quantity that measures the ability to cause change is:
Energy
200
What variables affect the amount of kinetic energy that an object has?
Mass and Velocity
200
What variables affect the amount of potential energy in an object?
Mass, Gravity and Height
200
A tennis ball rolls up a hill at an initial speed of 4m/s. It comes to a stop after 2s. What happens to the potential energy as the ball rolls?
Increases
200
Identify an example of potential energy
Anything above ground level. *Anything with the potential to fall!
300
The joule is defined as the:
Energy needed to push with a force of 1N
300
What is the formula for kinetic energy? Name the units for each variable.
KE= 1/2mv^2 m=kg v=m/s
300
Which has more potential energy: a 5kg rock lifted 2m on the Earth, or the same rock lifted 2m on the moon?
The Earth. Gravity is higher than on the moon.
300
A tennis ball rolls up a hill at an initial speed of 4m/s. It comes to a stop after 2s. What happens to the thermal energy as the ball rolls?
Increases
300
Identify an example of elastic energy
Stretching or bending to store energy, motion occurs afterwards
400
By definition, a joule pushes a specific force how far?
1 meter
400
A 6kg cat has a velocity of 10m/s. Solve for KE.
300J
400
A 6kg cat jumps off a 3m high couch. What is the cat's potential energy?
177J
400
A tennis ball rolls up a hill at an initial speed of 4m/s. It comes to a stop after 2s. What happens to the total energy as the ball rolls?
Stays the same
400
Identify an energy transformation from chemical to thermal.
Cellphones, etc
500
The unit of energy preferred by scientists is the:
Joule
500
The total energy of a system is 92J. The potential energy is 50J. 5J of energy is lost as heat. How much is kinetic energy?
37J
500
a 1kg coconut is falling out of a 12m high tree. What is the potential energy of the coconut right before it falls?
117.6J
500
Why would a ball rolling on the floor eventually come to a stop?
Friction
500
As a rollercoaster moves DOWN a hill, it's energy moves from mostly ________ to mostly ____________energy
Potential to Kinetic