This is the “energy of motion”. Moving objects have this form of energy. Kinetic Energy
“Stored’ energy is… Potential Energy
Energy is something elastic, like a rubber band, is called… Elastic Potential Energy
GPE = weight x height What is the GPE of a 35N rock balanced on the edge of a cliff 220m high? 35N x 220m = 7,700 J
The Law of Conservation of Energy states that …. Energy cannot be created or destroyed
What is Electrical Energy? Moving electrical charges that produce electricity
What type of energy does a sling shot have? Elastic Potential Energy
1 kilowatt (kW) is equal to _____ watts (W)?
Objects that are going really, really fast have… Objects that are going really, really fast have….? More kinetic energy Less kinetic energy Kinetic energy doesn’t change a. More kinetic energy
What do we call the ability to do work or cause change? Energy
What is Mechanical Energy? The energy in objects that move
GPE = mass x gravitational acceleration x height What is the GPE of a 30kg dog ready to jump on you off of a couch that is 0.5m high? 30kg x 9.8m/s2 x 0.5m = 147 J
The energy of a leaf ready to fall from a tree branch is called… Gravitational Potential Energy
The more thermal energy, The total energy of the particles in an object is which form of energy? Thermal Energy The more thermal energy, the more heat it has
P = work time What is the power used by a lawn mower that does 280 J of work in 1200 seconds? 280 J = 0.2W 1200 s
The energy stored in chemical bonds is which form of energy? Chemical Energy
What happens to the Gravitational Potential Energy of something if it moved to a higher place? The GPE will increase
Electromagnetic Energy Waves of energy, like light, microwaves, and x-rays is which form of energy? Electromagnetic Energy
KE = mass x velocity2 2 A 85kg bowling ball is rolling at 2 m/s KE = mass x velocity2 2 A 85kg bowling ball is rolling at 2 m/s. What is its kinetic energy? 85 x (2) 2 = 170 J 2
Objects with more mass have… Objects with more mass have…? More kinetic energy Less kinetic energy Kinetic energy doesn’t change a. More kinetic energy
A nuclear power plant is an example of which form of energy? Nuclear Energy
Coal, oil, wood, food are all examples of this form of energy. Chemical Energy
Power = force x distance time How long will it take a dog using 80 W of power to pull a 500N dogsled 1,000 m 80W = 500N x 1,000m time time x 80 = 500,000 x time 80 x time = 500,000 80 80 time = 6250 seconds
Energy stored in a spring is called… Elastic potential Energy
How do we determine the POWER of a machine? Power is the rate at which work is done.
The motor in a car provides this form of energy. Mechanical Energy
UV radiation from the sun is this form of energy. Electromagnetic Energy
Power = force x distance time It takes a kid 4 seconds to lift a 8N bag of dog food onto a shelf 3 meters high. How much power is he using? P= 8N x 3 m = 6W 4 s