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Work and Energy Energy.

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Presentation on theme: "Work and Energy Energy."— Presentation transcript:

1 Work and Energy Energy

2 Kinetic Energy Kinetic energy – energy of an object due to its motion
Kinetic energy depends on speed and mass Kinetic energy = ½ * mass * (speed)2 KE= ½mv2 Energy is measured in Joules (J)

3 Kinetic Energy

4 Work-Kinetic Energy Theorem
The net work done on an object is equal to the change in the kinetic energy of that object Net work = change in kinetic energy Work = Final Kinetic Energy – Initial Kinetic Energy Wnet=ΔKE W = KEf - KEi

5 Work-Kinetic Energy Theorem
Speed of the object and kinetic energy increase if work is positive Speed of the object and kinetic energy decrease if work is negative Kinetic energy is the work an object can do as it comes to rest

6 Potential Energy Potential energy – energy associated with an object due to the position of the object Relative and is based on a frame of reference Abbreviated PE or U Measured in Joules (J) Two main kinds of potential energy Gravitational and elastic potential energies

7 Gravitational Potential Energy
Gravitational potential energy (PEg) – potential energy associated with an object due to the position of the object relative to the Earth or some other gravitational source Based on height from a zero level Gravitational potential energy = mass * free-fall acceleration * height PEg=mgh As objects fall gravitational potential energy is converted to kinetic energy At the zero level, the object no longer has any gravitational potential energy

8 Gravitational Potential Energy

9 Gravitational Potential Energy

10 Elastic Potential Energy
Elastic potential energy – the potential energy in a stretched or compressed elastic object Energy of springs and rubber bands Relaxed length – the length of a spring when no external forces are acting upon it As the spring is compressed, elastic potential energy is stored in the spring

11 Elastic Potential Energy
Spring constant – a parameter that expresses how resistant a spring is to being compressed or stretched Has units of Newtons / meters (N/m) Elastic potential energy = ½ * spring constant * (distance compressed or stretched)2 PEelastic= ½kx2

12 Elastic Potential Energy

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