Kinetic Energy
What is Kinetic Energy?
The energy of motion.
What is the unit for Energy?
Joule
What is potential energy?
Energy that is stored and ready to be turned into kinetic energy.
"k"
If a 1000 kg car is traveling at 3 meters per second, what is its kinetic energy?
4500 J
What is the equation for Kinetic Energy?
(1/2)mv2
What are the two main types of energy?
Kinetic and Potential Energy
What is the equation for potential energy?
mgh
On a force v. stretch graph what does the spring constant represent of a line.
The slope
Where would a car traveling on a roller coaster have the most potential energy?
At the top
How does friction affect kinetic energy?
It decreases it.
What is Mechanical Energy?
The sum of potential and kinetic energy in an equation.
What is it called when potential energy is stored in a spring?
Elastic energy
What is the area under the line of a force v. stretch graph?
The elastic potential energy
What would happen to the kinetic energy of an object if you doubled the mass?
The kinetic energy would double.
Is kinetic energy a vector or a scalar? why?
Scalar. A ball thrown to the right with 5m/s velocity has the same kinetic energy as a ball thrown down at 5m/s velocity.
Who discovered Energy?
James Prescott Joule
What is the equation for Elastic Potential Energy?
1/2kx^2
What is a spring constant?
It is the quantity that represents how stiff a spring is.
If a plane was traveling at the same velocity as a bird, which would have the most kinetic energy (assuming the plane has more mass)?
Plane
If a 2kg ball is traveling at 4m/s, what is its kinetic energy?
16J
What is the measure of energy transfer that occurs when an object is moved over a distance by an external force?
Heat
If a spring is stretched 10cm two different times(total of 20cm), why isn't the stored energy the same each time it is stretched?
It takes more force to stretch an already stretched spring.
What is the equation for Hooke's Law and what does it state?
The equation is F= -kx, it states that the restoring force of a spring is directly proportional to the small displacement.
Becky throws a football. It has a kinetic energy of 6 joules and potential energy of 10 joules. The football's mechanical energy is----?
16J