Energy
Types of energy
What is Kinetic and Potential
W=change in KE
Energy can change from one form to another, but the total amount...
A) stays the same
B) changes
Stays the same
___ is equal to a constant force exerted on an object in the direction of motion x the objects displacement.
Work
Unit for energy
What is Joules?
When work is done on or by a system, the energy will...
A) change
B) stay the same
change
A system that does not gain or lose mass.
A force exerted over a given time
Impulse
How do you calculate impulse on a force v time graph?
By finding the area
The equation for KE
The equation for PE
KE=1/2mv2
PE=mgh
Is work a scalar or a vector
scalar
A system that does not have any external forces acting against it.
What is the impulse momentum theory
Impulse is = to the change in momentum
Kinetic energy
a) more
b) less
more
What is the unit for power?
What is the equation for power?
1) Watts
2) P=W/T
In a closed isolated system, energy can be...
a) destroyed
b) conserved
c) created
c) created
Momentum of an object is = to the _____ of the object multipled by the objects velocity
a) speed
b) mass
mass
a) Is impulse is a scalar or vector?
b) Is momentum is a scalar or vector?
Both are vectors
What is this?
Stored energy that results from an object's position in relation to a reference level.
Gravitational Potential Energy
Use the word bank: (Decrease/Increase)
If the work _______ the KE, then it is positive.
If the work ________ the KE then it is negative.
1) Increases
2) Decreases
Conservation of energy applied:
The sum of KE and PE
mechanical energy
Unit for momentum:
Equation for momentum:
2) p=mv
What is energy in short terms?
The ability of an object to produce a change in itself of the world around it.