section 2 simple machines. i. types of simple machines a.simple machine-a machine that does work in...
TRANSCRIPT
I. Types of simple machines
A. Simple Machine-a machine that does work in one motion.
1. There are six types of simple machines.
B. Levers – bar that is free to turn about a fixed point.
1. The fixed point is called a fulcrum
Resistance Force
Resistance arm
Effort arm
fulcrum
C. Pulley – a grooved wheel with a rope, chain, or cable running along the groove.
1. Fixed pulley-attached to a fixed object.
D. Wheel and Axle – two wheels of different sizes that rotate together.
1. usually the effort force is applied to the larger wheel.
II. Mechanical advantage (MA)
A. A ratio of the output force and the input force
1. MA greater than one = multiplying the input force
2. MA less than one = increase distance or speed.
C. Inclined Plane
MA = l
h
MA =Effort distance
Resistance distance
MA =length of slope
height of slope