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Science > Chapter 3: Simple machines revision > Flashcards

Chapter 3: Simple machines revision Flashcards

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1
Q

Work is only done when…

A

the object moves in the SAME direction in which the force is applied.

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2
Q

The unit of work is…

A

Joules

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3
Q

How do you calculate work?

A

W=Fd (Work/Joules=Force x distance)

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4
Q

True or False: The FARTHER you move an object, the more work you do.

A

True

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5
Q

What are simple machines?

A

They are machines that make work easier with only one movement.

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6
Q

What are the 6 types of simple machines?

A

Lever, Pulley, Wheel and Axle, Wedge, Inclined plane, screw

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7
Q

What machine is it when a grooved wheel with a rope or chain wrapped around it to raise, lower, or move a load?

A

Pulley

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8
Q

Does a pulley change a size or direction of a force?

A

Yes

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9
Q

What are the 3 types of pulleys?

A

A fixed pulley, A moveable Pulley, A pulley system (Block and Tackle)

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10
Q

What is a fixed pulley?

A

A fixed pulley is a type of pulley that changes changes the direction of the force you applied to an object.

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11
Q

What is a moveable pulley?

A

A moveable pulley is a type of pulley that multiplies the input force.

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12
Q

What is a pulley system (block and tackle)?

A

A pulley system/block and tackle is machine made up with two or more pulleys.

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13
Q

What are some differences between a fixed pulley and a moveable pulley?

A

A fixed pulley cannot move while a moveable pulley can.

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14
Q

What is a compound machine?

A

A compound machine is made up with 2 or more simple machines.

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15
Q

What is an inclined plane?

A

An inclined plane is a type of simple machine with a flat sloped surface.

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16
Q

What are some examples of inclined planes?

A

Some examples are ramps, stairs, slides, and waterslides.

17
Q

How does inclined plane make work easier?

A

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.

18
Q

What is a wedge?

A

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.

19
Q

What are some examples of a wedge?

A

Some examples are doorstops, scissor blades, a shovel, a axe, and etc.

20
Q

What are some examples of wedges in our body?

A

Some examples of wedges in our ody are teeth and fingernails.

21
Q

What is a screw?

A

A screw is a type of simple machine that has an inclined plane wrapped around a cylinder.

22
Q

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?

A

18 J

23
Q

Why is a screw considered an inclined plane?

A

It is because there is an incline plane wrapped around the screw.

24
Q

What is a lever?

A

A lever is a type of simple machine that has a rod/plank rotate or pivot around a fulcrum.

25
Q

How many classes does a lever?

A

3

26
Q

What are some examples of levers?

A

Some examples of levers are a seesaw, a scale balance, crowbar, scissors, and pliers.

27
Q

What is a wheel and axle?

A

A wheel and axle is a type of simple machine that consists of 2 circular objects of different sizes that rotate together.

28
Q

What are 2 ways a wheel and axle may work?

A

1) Applying the input force on the wheel, the output force being extorted by the axle.
2) Applying the output force on the axle, the output force being extorted.

29
Q

What are some examples of wheel and axles?

A

Some examples of wheel and axles are door knobs, Ferris wheels, windmills, and screwdrivers.

30
Q

What are pulleys?

A

Pulleys are a type of simple machine that has a grooved wheel which has a cable or rope wrapped around it.

31
Q

What are the 3 types of pulleys?

A

Fixed pulleys, moveable pulleys, pulley system (block and tackle).

32
Q

How does an fixed pulley work?

A

A fixed pulley works by changing the input force.

33
Q

How does a moveable pulley work?

A

A moveable pulley works by increasing the input force.

34
Q

What is a pulley system/block and tackle?

A

A pulley system/block and tackle uses several pulleys to increase the mechanical advantage.

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