Forces
Energy Equations
P for Potential
K for Kinetic
100
What is the SI unit for energy?
Joules
100
Identify the equation: =0.5x m X v(v)
Objects kinetic energy
100
Define the Law of conservation of energy.
Energy cannot be created or destroyed. It can only change forms.
100
A soccer player kicks a soccer ball high into the air. The ball travels up and then back down toward the ground. This graph represents the soccer ball's potential, kinetic, and total energy at what point?
It's highest altitude.
200
Which equation can be used to calculate work?
Work= Force X Distance
200
Identify the equation: + m X g X h
objects Potential energy
200
When an object spins or rotates, what is the force that acts toward the center of rotation?
Centripetal Force
200
Two teams play a game of tug-of-war. If the blue team wins by pulling the black team to the right. Explain why?
The force acting to the right is stronger.
300
What is the form of energy related to an object's movement?
Kinetic Energy
300
Noah carried a skateboard up a hill and then rode the skateboard down the hill. When Noah reached the bottom of the hill, he rolled to a stop. When did Noah have the most potential energy?
While standing on the skateboard at the top of the hill.
300
A woman gets in an elevator at the top of the Empire State Building and descends toward the ground floor. What happens to the woman's potential energy as she descends?
As height decreases, the woman's potential energy will decrease.
300
A person mowing a yard pushes a 40-kilogram lawn mower a distance of 1,500 meters. How much work has the person done?
60,000 joules of work
400
What kind of energy is considered stored energy?
Potential Energy
400
This graph shows the potential energy of a 6-kilogram bald eagle as it takes off from the ground into the air. What would you estimate the eagle's potential energy to be at a height of 5.5 meters?
325 joules
400
An airplane traveling at a constant altitude loses mass as it uses up jet fuel. What happens to the plane's potential energy as it uses up fuel?
As mass decreases, the plane's potential energy will decrease.
400
A cheetah chasing an antelope increases its velocity to catch the antelope. Assuming the mass of the cheetah stays the same, what happens to the cheetah's kinetic energy as it increases velocity?
As velocity increases the cheetah's kinetic energy increases