Chapter 3: Simple machines revision Flashcards
(34 cards)
Work is only done when…
the object moves in the SAME direction in which the force is applied.
The unit of work is…
Joules
How do you calculate work?
W=Fd (Work/Joules=Force x distance)
True or False: The FARTHER you move an object, the more work you do.
True
What are simple machines?
They are machines that make work easier with only one movement.
What are the 6 types of simple machines?
Lever, Pulley, Wheel and Axle, Wedge, Inclined plane, screw
What machine is it when a grooved wheel with a rope or chain wrapped around it to raise, lower, or move a load?
Pulley
Does a pulley change a size or direction of a force?
Yes
What are the 3 types of pulleys?
A fixed pulley, A moveable Pulley, A pulley system (Block and Tackle)
What is a fixed pulley?
A fixed pulley is a type of pulley that changes changes the direction of the force you applied to an object.
What is a moveable pulley?
A moveable pulley is a type of pulley that multiplies the input force.
What is a pulley system (block and tackle)?
A pulley system/block and tackle is machine made up with two or more pulleys.
What are some differences between a fixed pulley and a moveable pulley?
A fixed pulley cannot move while a moveable pulley can.
What is a compound machine?
A compound machine is made up with 2 or more simple machines.
What is an inclined plane?
An inclined plane is a type of simple machine with a flat sloped surface.
What are some examples of inclined planes?
Some examples are ramps, stairs, slides, and waterslides.
How does inclined plane make work easier?
An inclined plane makes work easier by making it easier to move an object. It takes less force to move an object upward then straight.
What is a wedge?
A wedge is a type of simple machine that is an inclined plane that moves. It can be made up of 2 inclined planes or 1.
What are some examples of a wedge?
Some examples are doorstops, scissor blades, a shovel, a axe, and etc.
What are some examples of wedges in our body?
Some examples of wedges in our ody are teeth and fingernails.
What is a screw?
A screw is a type of simple machine that has an inclined plane wrapped around a cylinder.
You push a shopping cart with a force of
12 N for a distance of 1.5 m. You stop
pushing the cart, but it continues to roll
for 1.1 m. How much work did you do?
18 J
Why is a screw considered an inclined plane?
It is because there is an incline plane wrapped around the screw.
What is a lever?
A lever is a type of simple machine that has a rod/plank rotate or pivot around a fulcrum.
