Welcome back minions. Instructions and warm-up on the board.

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Presentation transcript:

Welcome back minions. Instructions and warm-up on the board.

QUIZ!!! Clear your desk. Get out a sheet of paper. Put your First and Last name on the top, along with the period. Number your paper 1 to 10. Pay attention!!!

#1 This machine is a flat, sloped surface. It is usually used to lift an object.

#2 This machine is thick on one end and tapers to a smaller edge at the other end. This is usually used for separating.

#3 This machine is an inclined plane wrapped around a cylinder.

#4 This machine is a rigid bar that is free to pivot or rotate at a fixed point.

#5 Which class lever is this?

#6 Which class lever is this?

#7 Which class lever is this?

#8 and #9 WORK = _________ x __________

#10 True or False A Screwdriver can be used as a first class lever, a third class lever, a wedge, and a wheel and axle.

Wheel and Axle Where have you seen a wheel and axle before? What is a wheel and axle? Wheel and Axle: A machine made of two circular cylindrical objects fastened together that rotate about a common axis.

Good question yesterday… What would the tool, the screwdriver, be classified as in reference to a simple machine? Answer: Wheel and Axle

Mechanical advantage… The greater the ratio between the wheel and axle, the greater the mechanical advantage. Think of the wheels of the balloon racer!

Pulley Where have you seen a pulley before? What is a pulley? Pulley: A simple machine made of a grooved wheel with a rope or cable wrapped around it.

How it works… You pull on one end of the rope. The other end is attached to the load. It changes the input force in two ways – Decrease input force – Change direction of force.

Types of pulleys 3 Types of Pulleys:

Mechanical advantage Pulley’s mechanical advantage is equal to the number of sections that support the load.

Simple machines in the body… Some of you wondered about this…

Compound machines… Compound machine: – A machine that utilizes two or more simple machines.

Homework Give me 3 examples of a compound machine. – Must have a picture of the compound machine. – Point out and identify the parts that are simple machines.