Work, Power, Machines Ch 4

Work is done on an object when the

• Object moves and in same direction

• object moves but in different direction

• object does not move

• Object moves but does not change direction

the number of times a machine increases a force exerted on it

• ideal mechanical advantage

• mechanical advantage

• actual mechanical advantage

no friction does not exist

• mechanical advantate

• ideal mechanical advantage

• actual mechanial advantage

number of times a machine multiplies the effort force

• actual mechanial advantage

• ideal mechanial advantage

• mechanical advantage

Changes the direction of the force

can multiply force

• First class Lever

• 2nd class lever

• 3 class lever

choose all 1 class levers

• scissors

• wheel barrow

• see-saw

• hockey stick

basball, hockey, stick, broom are examples of what type of levers

• 1st class lever

• 2nd class lever

• 3 class lever

an inclined plane wrapped around a cylinder, increases distance

• wedge

• screw

• pulley

• wheel and axle

light bulb is an example of a

• pulley

• wedge

• screw

• inclined plane

a moving inclined plane

sloped on 1 or 2 sides

increases force

• wedge

• screw

• pulley

• inclined plane