What is Energy?
Which has a greater gravitational potential energy? A book lifted 1 meter off the ground or the same book lifted 10 meters off the ground
10 meters because the book weighs the same but it is at a greater elevation
Define elastic potential energy
Energy associated with objects that can be compressed or stretched
What is potential energy?
Energy that results from the position or shape of an object
How can you calculate an object's gravitational potential energy?
GPE= Weight x gravityxheight
What is energy measured in?
Joules
The formula for kinetic energy is
KE=1/2mv^2
What are two basic types of energy?
Kinetic and potential energy
The formula for potential energy is
PE= mass x height (mass is weight)
Define gravitational potential energy
Potential energy related to an object's height
What happens when you do work on an object?
Some of your energy gets transferred to that object
What factors affect an object's kinetic energy?
Speed and mass
Energy
The ability to do work or cause change
How can we define power as an amount
The amount of energy transferred in a unit of time
Define kinetic energy
The energy an object has due to its motion (anything moving).
What happens to an object's kinetic energy as its speed increases?
The faster the object moves the more kinetic energy it has
What happens to an object's kinetic energy if it's mass increases?
The greater mass it has the more kinetic energy the object has what
What happens when energy is transferred?
The object upon which the work is done gains energy
What is power?
The rate at which work is done
You can think of work as ____
Transfer of energy
When is work done?
When a force moves an object
Example of elastic potential energy
When a girl is jumping on a trampoline, the trampoline changes shape and stored energy sends her upward
Gravity is
the force of attraction that exists among all matter in the universe and is 9.8 m/s2
