Concepts of Physics – PowerPoint Presentation

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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