Work and machines
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Transcript of Work and machines
Work
• Work is energy transferred that causes the object to move in the direction of the force — no movement, no work.
• Formula for work: W = F x d
• Units: – Work – joule (J)– Force – newton (N)– Distance – meter (m) or depends on problem
• Power is the rate at which work is done
• Formula: P = W/t
• Units:– Power – watt (W)– Work – joule (J)– Time – seconds (depends on problem)
Machines
• Machine – device that makes work easier by changing the size or direction of the force
• Machines let you swap force for distance or distance for force….you still do the same amount of work
Pulleys – grooved wheel that holds rope or cable
Wheel and axle – 2 circular objects of different sizes (wheel is larger)
Inclined plane – straight slanted surface
Wedge – two inclined planes that move
Screw – inclined plane wrapped around a cylinder
Compound machine – made of more than one simple machine