Potential & Kinetic Energy
This is stored energy
Potential Energy
A football weighing 4kg is thrown at a speed of 30 m/s. What is the football's Kinetic Energy?
KE= 1/2 mv2
KE= 1/2 4(30)2
KE= 2 * 900
KE= 1,800J
These forms of energy travel in waves. We see/hear them.
Sound and Light
Our body converts food into what type of energy?
Chemical
The ability to do work.
Energy
Gravitational and Elastic Energy are both types of this energy.
Potential
This is the energy of movement
Kinetic
A bell at the top of a 45m tower weighs 190N. What is its potential energy?
PE= m * h
PE= 190 * 45
PE= 8,550J
A form of energy used when a soccer player kicks the ball.
Mechanical
A light bulb converts electrical energy into which 2 types of energy?
Light and Heat
Where does a yo-yo have the most potential energy?
Rolled up in your hand
At the end of the string
Rolled up in your hand
The energy of motion and movement
Kinetic
This energy has to do with how we stay attached to the ground
Gravitational Potential Energy
A baseball player uses 150N of force to throw the ball. It lands 10m away. How much work does the baseball player use?
W= F * D
W= 150 * 10
W= 1,500J
This type of energy is released when objects that were moving against each other stop.
Thermal/Heat
Name 2 of the 3 types of energy that the electrical energy of a hair dryer is transformed into.
Mechanical, Sound, Heat
Where does a yo-yo have the most potential energy?
Rolled up in your hand
At the end of the string
At the end of the string
Define Radiant Energy
Energy from light
What is the formula for finding Potential Energy?
PE= M * H
A gardener does 2,400J work while pushing a wheelbarrow 8m. How much force was used?
W= F * D F= W/D
2,400= F * 8 F= 2,400/8
3N = F F= 3N
Energy stored in the bonds of atoms and molecules
Chemical Energy
A solar panel converts this type of energy into what other type of energy?
Light, Electrical
Name the two types of potential energy
Gravitational, Elastic
Define Electrical Energy
Energy from the movement of atoms
What is the formula for finding Kinetic Energy?
KE= 1/2 mv2
A person moves a large box that weighs 20N 30m in 30s. How much power was used?
W= F * D
W= 20 * 30
W= 600
P= W/t
P= 600/30
P= 20w
Energy that is stored in the nucleus of an atom, released when the nucleus is split.
Nuclear Energy
The process that plants use to transform light energy into food.
Photosynthesis
This law states that energy is never created or destroyed, it is only changed from one form to another.
The Law of Conservation of Energy
Define Nuclear Energy
Energy stored in atoms