Work
In order for work to be done, what must be true of force and displacement?
They must be parallel to each other.
If an object is not moving, it has ___ Kinetic Energy.
0
Potential energy is the energy due to ____.
Position
The definition of the law of conservation of energy is ____.
Energy cannot be created or destroyed. OR
The total energy of an isolated system remains constant.
Mass * acceleration is formula for what?
Force
What is the sign of work if your object is slowing down?
Negative
The sign of kinetic energy is _____ positive.
Always
Equal
This type of energy is associated with the random, disordered motion of molecules or refers to the invisible microscopic energy on the atomic and molecular scale.
Internal energy
1/2 mv2 is the formula for what?
Kinetic Energy
Is work being done if a car speeds up on a flat road?
Yes
Ball A has double the mass of ball B. What is the ratio of Kinetic Energy of A to B.
2:1
What are the units for a spring constant?
N/m
Each one of these has an associated potential energy.
Conservative force
Mgh is the formula for what?
Gravitational potential energy
What are the units of Work? ( 2 answers)
Joules, Nm
If the velocity of an object triples, its Kinetic Energy will be...
9 times greater
Potential energy is always measured relative to ____.
The ground or an arbitrary zero level
When energy becomes spread out and difficult to find or to use, energy is said to...
dissipate
What is the formula for the potential energy stored in a spring?
Us=1/2kx2
If speed is constant during the motion, will it affect how much work is done?
No
If friction is the only force acting on an object, will its Kinetic Energy increase or decrease?
Decrease
If the length of a stretched spring is cut in half, it's spring potential energy would be ____.
1/4
This is a type of system that has no work being done to it by external forces.
Closed, isolated system
What is the total net work equal to?
the change in energy or the NET force x distance.