Unit III Power Point
Concepts of Physics
Potential Energy
Potential energy is associated with mass and relative location. Potential energy is static, which is energy that isn’t moving. The rock in the picture is the potential energy because it is not moving, but could move soon.
Height= 20 Feet
Mass= 3 Tons
Ep =mgh = 6000 x 33 x 20 =Flat Roadruner
Not Moving
Kinetic Energy
Kinetic energy is the energy of an object that it possesses due to motion. The Roadrunner is the kinetic energy because the Roadrunner is moving.
Mass
Velocity
KE = 0.5 x mv ^2
KE = 0.5 x 10lbs x 30mph^2 = Hungry Coyote
Moving
Newton’s Second Law
Newton’s Second Law states that the rate of change of momentum of a body is directly proportional to the force applied, and this change in momentum takes place in the direction of the applied force. The second law can also be stated in terms of an object’s acceleration. The space shuttle is a good example of Newton’s Second Law because the shuttle is accelerating.
Acceleration
Force
Mass
Impulse-Momentum
Momentum can be related with force. A change in momentum is called the impulse. The astronaut’s jet pack is a good example of impulse-momentum because the astronaut is able to change his momentum with an boost from the jet pack to create an impulse.
Impulse
Mass
Momentum = Mass x velocity
Momentum Conservation
Momentum conservation is exemplified in curling because the players try to keep the stones moving until they reach the target.
Newton’s Third Law
Newton’s Third Law states that for every action there is an equal and opposite reaction. The recoil of a gun is a good example of Newton’s Third Law.
Work
Work can be defined as transfer of energy. Work is done when you transfer energy from one object to another. Raking leaves is a good example of work. The person transfers energy from the rake to the leaves.
Energy
Energy can be defined as the capacity for doing work. The example of mechanical energy in the picture is forcing the leaves to move.
Power
Power is the work done in a unit of time. Power is a measure of how quickly work can be done. How quickly the person rakes the leaves is the power.
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