Physics 104 chapter 2

Physics 104 chapter 2 - Power= work/ time Power= force x...

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Physics 104 Chapter 2 WHEELS: A wheels main purpose is to overcome friction Two surfaces that are in relative motion are traveling with different velocities so that a person standing still on one surface would observe that other surface as moving. Friction- opposes the relative motion of 2 surfaces in contact with one another The harder you press 2 surfaces together, and the more contact points the 2 surfaces have, the larger the frictional forces they experience. Friction always opposes relative motion Sliding friction- acts to stop objects from sliding Static friction – acts to keep objects from starting to slide , it always exerts a frictional force that exactly balances your push Traction- the largest amount of frictional force that an object can obtain from a surface at any given moment WORK ENERGY AND POWER: Ordered energy- energy that can easily be used to do work Thermal energy (internal energy) - disordered energy Power- the amount of work you do in a certain amount of time.
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Unformatted text preview: Power= work/ time Power= force x velocity Power= torque x angular velocity Power= torque x angular velocity Power= force x velocity SI UNIT- -Power= joule per second or watt-Static friction exerts torques on the rollers and hence is what makes them rotate in the first place Coasting forward: Linear momentum -Energy is directionless, it is not a vector quality Linear momentum (momentum) is the measure of an objects translation motion- its tendency to continue moving in a particular direction Momentum= mass x velocity The greater an obejects mass and velocity the more momentum an object has in the direction it is moving SI UNIT- -Momentum= kilogram meter per second Impulse- a force exerted on an object for a certain amount of time Impulse= force x time Impulse= large force x short time = small force x long time If the momentum gained by one object is equal to the momentum lost by anther object, you can say that momentum was transferred...
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This note was uploaded on 02/22/2012 for the course CRJS 100 taught by Professor Stew during the Fall '11 term at Maryland.

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Physics 104 chapter 2 - Power= work/ time Power= force x...

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