Types of Energy
This type of energy is stored in food and fuel.
chemical potential energy
Green plants convert light energy into this type of energy during photosynthesis
chemical potential energy
The formula for calculating work
Work = Force × Distance
The formula for gravitational potential energy
PE = mgh
When water is heated from 10°C to 20°C, what happens to its kinetic energy?
it increases
The energy of moving objects.
kinetic energy
The energy conversion that occurs when a toaster is used.
electrical energy to thermal energy and radiant(light) energy
SI unit of energy
Joule
The kinetic energy of an object increases as its ____ increases
speed
What type of energy will eventually run out?
nonrenewable energy
The energy stored in an object due to its height above the ground
gravitational potential energy
This force causes kinetic energy to transform into thermal energy.
friction
The rate at which work is done
power
If a 55 kg box is sitting 8 meters above the ground, what is its potential energy
4,312 J
A baseball player wants to hit the ball farther. Which is more effective: doubling the bat's mass or doubling the swing speed?
doubling the swing speed
The total amount of kinetic and potential energy in a system
mechanical energy
What type of energy conversion occurs when a roller coaster moves downhill?
gravitational potential energy to kinetic energy
If a machine does 28 J of work in 7 seconds, how much power is used?
4 W
A 5 kg apple sits on a 1.5 m tree branch. What is its potential energy?
73.5 J
The law that states energy cannot be created or destroyed, only transferred or transformed.
the law of conservation of energy
This energy is created by the heat inside the Earth.
geothermal energy
A wind turbine converts what type of energy into electrical energy?
mechanical energy
A force of 30 N is used to push a box 5 meters. How much work is done?
150 J
A roller coaster car (500 kg) starts from rest at a height of 50 meters. What is its speed at the bottom of the hill? (Assume Potential Energy has the same value as Kinetic Energy)
31.3 m/s
When an object falls, what happens to its potential and kinetic energy?
What is GPE decreases, KE increases?