Simple Machines
Why do we use simple machines?
To help make work easier, like lift or move objects.
How many simple machines are needed to make a complex machine?
Two or more
Does Tug of War require a pushing force or a pulling force?
Pulling Force
What is a mechanism?
A part of a machine that helps it do work
What are gears used for?
Locate the answer on page 24
Gears are used to change speed, direction, and torque (rotational force - i.e. how strong something twists)
What simple machine has a fulcrum?
A Lever
Identify 2 Complex Machines
You did it!
Force involves a ____ or a ____ to move an object
Push or a Pull
Do brakes modify the speed or direction of a car?
Speed
What five machines use a gear mechanism?
Unscramble the letters on page 25.
Clock, Bicycle, Drill, Car, Guitar
A wheelchair ramp is an example of what simple machine?
An Inclined Plane
A Bicycle has these two simple machines: ______________ & _______________
Wheel and Axle and Pulley
A force can make an object change its speed, shape, or d_________.
Direction
Identify 2 of the 3 types of pulleys discussed in class
A fixed pulley, moveable pulley, and/or compound pulley
Identify one similarity and one difference between a spur gear and a crown gear.
No writing is required. Locate the answer on page 26.
Similarity - spur gears and crown gears have teeth
Difference - a spur gear is flat while a crown gear has teeth at a right angle
Identify this simple machine - A cylinder with an inclined plane wrapped around it
A screw
A shovel has these two simple machines: _____________ & ______________
Lever & Wedge
How can we change the speed of a car?
Pushing the gas pedal or break pedal
Which pulley system requires the least amount of force to lift a load?
Think back to when we tested the pulleys in class.
Compound Pulley / Block and Tackle
Where would we find a worm gear being used?
Locate the answer on page 27
To tune a guitar
Identify four of the six simple machines
Lever, Wheel & Axle, Inclined Plane, Screw, Wedge, Pulley
An Inclined Plane and Wheel and Axle
A ____________ measures the amount of force required to move an object
Newton / Spring Scale
Mechanisms can be used to change the _____________ of Movement or the ___________ of Force
Identify one answer.
Direction, Type, and Speed of Movement
Amount of Force
a) If the first gear rotates clockwise, what direction does the second gear turn?
Locate your answer on page 29.
Counter-clockwise