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# McCormack-Simple M

### McCormack - Simple Machines

When is Work done on an object? Work is done when the object moves in the same direction that the force is acting
What is the formula for Work? Work = Force x Distance
How does a machine help to do Work? Machines make work easier
What is the formula for Power Power = Force x Distance / Time
Give three ways machines help to do Work? They can change the Size, Distance, or Direction of the Effort Force.
Input Force (Effort) The force you exert on a machine
Output Force (Load) The force the machine exerts on an object
What is the Mech. Adv. of a Pulley that takes 25 N of effort to move a 100 N load? Mech. Adv. = 100 N / 25 N = 4
What is an Incline Plane? A simple machine with a flat, sloped surface
What is a Wedge? A simple machine that is thick on one end and tapers to a thin end on the other.
What is a Screw? A simple machine that is an incline plane wrapped around a cylinder.
What is a Lever? A simple machine rigid bar that is free to pivot on a fixed point
What is a Fulcrum? The fixed point that a lever pivots around.
What is a Class 1 Lever? A Lever with the fulcrum in the middle.
Give one example of a Class 1 Lever? A crow bar, can opener, or scissors
What is a Class 2 Lever? A Lever with the fulcrum on one end, the load in the middle and the effort on the end
Give one example of a Class 2 Lever? A wheel borrow
What is a Class 3 Lever? A Lever with the fulcrum on one end, load on the other end, and the effort in the middle
What is a Wheel & Axle? A simple machine made of two circular objects fastened together that rotate about a common axis
Give one example of a Wheel & Axle? A screw driver, tire, wheel and hub
What is a Pulley? A simple machine made of a groved wheel with a rope wrapped around it.
What is a Fixed Pulley? A mounted pulley that changes the direction of the force
What is a Movable Pulley? A moving pulley that changes the amount of input force
What is a Block & Tackle? A pulley system made up of fixed and movable pulleys.
What is a Compound Machine? A machine that has two or more simple machines
What is a Watt? A small unit of Power1 horsepower = 746 watts
Calculate the Work if you move 60N up a ladder that is 11 meters tall? W = FxD, 60N x 11m = 660 J
What is the Power if you lift 125 N of weight 2 meters high in 5 seconds? W = FxD, 125 N x 2m= 250 J P = W/t , 250 J/ 5 s = 50 W
A ramp is 10 meters long and 2 meters high, what is the Mech. Adv.? MA = Ramp Length/ Ramp Height = 10 m/2 m = 5
An wheel has an outer radius of 35 cm and an axle of 5 cm, what is the Mech. Adv.? MA = Outer radius / Inner radius = 35 cm / 5 cm = 7
A lever is 12 meters long from the Effort to the fulcrum and 3 meters from the fulcrum to the Load, what is the MA? MA = Length Input/ Length Output = 12m / 3 m = 4
What is the trade off if a Block & Tackle has a MA of 4? Effort goes down by 4 X but the ____________________________________ Distance increases by 4 X.
Created by: fmccormack