Simple Machines

Question 1

First class lever

Answer 1

Fulcrum in the middle with Effort and Load on either ends

Ex: See-saw

Question 2

Second class lever

Answer 2

Load in middle with Fulcrum and Effort on either ends

Ex: Wheel Barrel

Question 3

Third class lever

Answer 3

Effort in the middle with Fulcrum and Load on either ends.

Ex: Arm lifting wights

Question 4

First class pulley (FIxed)

Answer 4

Pulley doesn’t move up or down

Input force = Output force (MA = 0)

Question 5

Second class pulley (Moveable)

Answer 5

Pulley moves upward or downwards

Input force = 1/2 output force (MA = 2)

Question 6

Third class pulley (Block and Tackle)

Answer 6

Combination of at least one fixed and one movable pulley
Input force = 1/(number of ropes supporting the load) output force (MA = number of ropes between pulleys that support the load.)

Question 7

How do you determine the mechanical advantage of a pulley?

Answer 7

Count number of ropes between pulleys that support the load.
Ex: Three pulleys, MA = 3
Seven pulleys, MA = 7

Question 8

Inclined Plane

Answer 8

Ramp used to get to different levels

Ex: Stairs, Slide

Question 9

Wheel and Axel

Answer 9

A wheel attached to a rod which both turn together

Ex: Car wheel and axel

Question 10

Wedge

Answer 10

A pointed tool used to cut or pry apart two objects

Ex: Ax

Question 11

Screw

Answer 11

An inclined plane wrapped around a cylinder

Ex: Screw