Kinetic Energy
What is the formula for calculating Kinetic Energy?
1/2mv2
What is the formula for calculating GPE?
mgh
What is the formula for calculating Elastic Potential Energy?
1/2kx2
What is the definition of Work?
The change of energy in the system due to external forces acting on our system.
What is the work-energy theorem?
Work is equal to the change in Kinetic Energy
A car with a mass of 1000 kg is traveling at a speed of 20 m/s. Calculate its Kinetic Energy. With the correct units.
200,000 J
A 2 kg object is lifted to a height of 10 meters above the ground. Calculate its Gravitational Potential Energy.
200 J
A spring with a spring constant of 100 N/m is stretched to a length of 0.2 meters. Calculate its Elastic Potential Energy.
2J
What conditions are required for negative work to be done?
A force is applied opposite the direction of motion.
Name the 2 times when no work is done
Force and displacement are perpendicular OR when a force is applied but no displacement is caused
A ball with a mass of 0.5 kg is moving with KE of 2.5J Calculate its velocity. With correct units.
3.16 m/s
What happens to the Gravitational Potential Energy of an object if its height above the ground is doubled?
A spring is stretched to a length of 0.5 meters to create 25J of EPE. Calculate its spring constant. With correct units.
200 N/m
A force of 200 N acts on an object and displaces it by 2 meters. Calculate the work done on the object.
400 J
Explain the concept of energy conservation
Energy cannot be created or destroyed, it is either transformed into another type of energy or transferred out of the system.
A car weighing 13,000N is moving with a velocity of 22 m/s. Calculate its kinetic energy. With correct units.
314,600 J
An object has a mass of 10 kg and a GPE of 5000J. Calculate its height above the ground. Including correct units.
50 meters
What happens to the Elastic Potential Energy of a spring if its stretch is cut by half the distance?
EPE is less by 1/4.
A force of 80 N is applied at an angle of 30o to move an object a distance of 5 meters. Calculate the work done. With correct units.
346.4 J
A roller coaster starts from rest at the top of a hill with an initial potential energy of 2000 J. If it reaches the bottom with a kinetic energy of 1500 J, calculate the mechanical energy loss.
500J loss
How does the kinetic energy of an object change when its velocity is doubled?
KE 4 times larger
A ball weighing 5 N has a GPE of 32J. What is the height?
6.4 meters
The EPE of a spring is 19J when it is compressed by 22cm, find the spring constant. With correct units.
785.124 N/m
How does positive work done on a system relate to its change in kinetic energy?
It will increase the speed and therefor increase the KE of the system
A car with a mass of 1300kg is traveling with a velocity of 20m/s, then slows down over 30 meters to a new speed of 5m/s. Find the force that was acting on the car while it was breaking. Including the correct units.
- 8125 N