Key Terms
Explain the Law of Conservation of Energy
Energy cannot be lost or gained, but it can be transferred from one object/place to another, and transformed into different types of energy.
Kinetic energy depends on these two variables.
Mass and velocity
In the GPE formula, what units are used to measure mass?
kilograms
This is the flow of thermal energy from warmer objects to colder objects.
What is heat?
At the highest point in the swing of a pendulum, what type of energy does it have?
What is potential energy?
This is the ability to do work.
What is energy?
What is the KE of a 2kg ball being thrown at 10m/s?
100J
In the GPE formula, "g" stands for...
The acceleration due to gravity, which is 9.8 m/s^2 on Earth
These are resources that can be replaced in a relatively short period of time.
What are renewable resources?
What form of energy is created in the Sun?
Nuclear energy
This metric unit is used to measure the amount of energy.
What is the Joule (J)?
Find the mass of an object traveling at 50m/s with 10,000J of kinetic energy.
Mass = 8kg
Find the GPE of a 3-N textbook sitting on a desk 1.5m off the ground.
4.5J
Give 2 examples of renewable resources.
What is hydroelectric, solar, geothermal, nuclear fusion, biomass, or wind?
How are energy and work related?
What is work is the transfer of energy?
This is energy in motion.
What is kinetic energy?
Which variable affects the amount of kinetic energy in an object more? Explain your answer.
Velocity, because it is squared in the KE equation.
Find the GPE of a 20 kg bowling ball on top of CHS (12m high).
2,352J
Finding ways to use less energy or use energy more efficiently is called...
What is energy conservation?
The energy we get from food is this form of energy.
What is chemical energy?
This is energy stored due to work done against gravity.
What is gravitational potential energy?
Imagine that a car and truck are traveling down the road side by side. They are traveling at the same speed, but the truck has three times the mass of the car. If the KE of the truck is 9000J, what's the KE of the car?
3000J
Imagine that a boulder is sitting on the edge of a cliff 20m high. At this height, it has a GPE of 50J. How much GPE will it have when it falls to a ledge 8m below?
20J
Nonrenewable resources such as oil, coal, and natural gas are considered what?
What are fossil fuels?
This is the sum of potential and kinetic energy.
What is mechanical energy?