Force, Work and Thermal Energy

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Presentation transcript:

Force, Work and Thermal Energy

Force Force: Causes a mass to accelerate Force=mass* acceleration=F= m a

Work and Energy Work: the result of applying a force to an object in order to move it a certain distance work= Force . distance=F.d Energy: the capacity to do work i.e. to do 100 J of work, 100 J of energy is needed Work is done to the car when it moves The battery provides the energy to do the work

Thermal Energy Thermal energy: the energy of a body that increases with temperature Change in energy= (mass)(specific heat capacity)(change in temperature) ΔE=m c ΔT Specific Heat Capacity: how much thermal energy a material can absorb– water has a high specific heat (J/(kg-K)

Thermal Energy Energy is released (or absorbed) when an object changes its state Latent heat (L): amount of heat released or absorbed by a substance (kJ/kg) ΔE=m L Melting ice absorbs heat from the air and cools down a room

Temperature Units To convert Into Multiply by Fahrenheit (°F)-32 Celsius (°C) 5/9 Fahrenheit (°F)+459.67 kelvin (K) Celsius (°C)+17.7778 Fahrenheit (°F) 1.8 Celsius (°C)+273.15 1 http://www.stuffintheair.com/images/therm.jpg

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