Unit2 Lesson4 Flashcards
Potential and Kinetic Energy
1
Q
What is Energy?
A
- The ability to do work
- The ability to move or cause change in matter.
2
Q
What is mechanical energy?
A
Mechanical energy is the energy possessed by an object due to its state of rest or state of motion. Two types of mechanical energy:
* Potential: stored energy
* Kinetic: moving energy
3
Q
Potential Energy Examples
A
- Car on a hill
- Apples in a tree
- A bow being pulled
4
Q
Kinetic Energy Examples
A
- Windmill rotating
- Boy skateboarding
- Woman cycling
5
Q
What is potential energy?
A
- Stored energy in an ojbect tht depends the relative postion of the object
- Ready to be used, but not being used
- Can be transformed into other types of energy
- SI unit Joule (J)
- Distnace (height) and mass determine its measure
- Found in all objects
6
Q
The amount of potential energy is determined by?
A
Its height and mass.
* The higher an object, the greater its potential energy.
* The greater the mass the greater the potential energy.
7
Q
What is elastic potential energy?
A
- Stored energy in elastic materials because of their stretching or compressing
- Amount of energy stored is related to the amount of stretch applied
- More stretch –> the more stored energy
- When the stress is released, the potential energy is converted into kinetic energy or other forms.
8
Q
What is kinetic energy?
A
- Energy of motion
- Formed or caused by motion
- Can be transformed into other types of energy
- SI unit Joule (J)
- Speed/velocity and mass determined its measure
- Found in all objects
9
Q
Amount of kinetic energy is determined by?
A
- Speed/velocity and its mass
- The faster an object moves the greater its kinetic energy.
10
Q
Transformation of energy
A
- Potential energy is greatest at the top of the roller coaster.
- The kinetic energy increases and the potential energy decreases.
- When the roller coaster goes back up the hill, the energy is converted back to potential energy.
