Types of Energy
Energy in motion
Kinetic energy
Person A and Person B are both using the same amount of work to lift something. Person A takes half the time to do it. Who has greater power?
Person A
Units of time (IN THIS UNIT SPECIFICALLY)
seconds
Amy uses 20N of force to push a lawn mower 10 meters. How much work does she do?
200 joules
Can energy be created or destroyed?
NO
The type of energy in the rubber bands of the rubber band cars
Elastic potential energy
If you increase work and decrease time, will you have more or less power?
MORE
Units of distance (FOR THIS UNIT)
meters
A force of 12.2 Newtons moves a box a distance of 3.2 meters. How much work was done?
39.04 joules
What are the units for energy?
Joules
A hot cup of coffee has what type of energy?
Thermal energy
If 68 joules of power is produced in 18 seconds, how much work is done?
1,224 Joules
Units of Force (IN THIS UNIT)
Newtons
If 45 joules were needed to move a 10 Newtons crate, how far was the crate moved?
4.5 meters
Energy is stored to be used later. What is it called when we use this stored energy?
Work
Batteries have what type of energy?
Chemical energy
How much power is required to do 40.8 Joules of work in 3.3 seconds?
12.36 watts
Units of Work (IN THIS CLASS)
Joules
A baseball player does 1,234 Joules of work when hitting a baseball into left field. Assuming the baseball landed 100 meters away from home plate, how much force did the player use to hit the ball?
12.34 Newtons
What is it called when energy moves from one form (ex. Potential) into another form (ex. Kinetic)?
Energy Transnfer
Gasoline in a car contains what type of energy?
Chemical energy
How much time is needed to produce 550 joules of work if 60 watts of power is used?
9.16 seconds
Units of Power (IN THIS CLASS)
Watts
A soccer player kicks a ball with a force of 120 N, and the ball moves 0.5 m while the player’s foot is in contact with it. How much work does the player do on the ball?
60 Joules
In the BANK example, is energy the money we have or what we spend it on?