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Science Flash Cards 7th grade > Science flahscards week 10 > Flashcards

Science flahscards week 10 Flashcards

Science flahscards week 10

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1
Q

What is work?

A

Work occurs when you exert a force on an
object that causes the object to move some
distance.

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2
Q

What is work power?

A

The rate at which work is done.

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3
Q

What is a machine?

A

A machine js a device that allows you to do
work (Wi) easier or more effectively.

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4
Q

What are levers?

A

Rigid bar that pivots/rotates on a fixed
point.

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5
Q

What is a Fulcrum?

A

Fixed point that a lever pivots
around.

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6
Q

What is Mechanical Advantage?

A

The number of
times a machine increases the input force.

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7
Q

What is efficiency?

A

compares output work to input work.
An ideal machine’s efficiency.

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8
Q

What is a wheel & axle?

A

two circular/cylindrical objects
that are connected together and rotate around
a common axis.

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9
Q

What is a wheel?

A

larger radius object

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10
Q

What is an Axle?

A

smaller radius object

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11
Q

What is a pulley?

A

A grooved wheel with a rope (cable)
wrapped around it.

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12
Q

What are the three pulleys?

A
  1. Fixed Pulley
  2. Movable Pulley
  3. Block & Tackle.
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13
Q

What is a fixed pulley?

A

Pulley attached to a structure.

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14
Q

What is Movable Pulley?

A

Pulley attached to moving object.

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15
Q

What is a Block & Tackle?

A

Fixed & Movable pulley system.

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16
Q

What is a compound machine?

A

A combination of two or more simple machines.

17
Q

What is a inclined plane?

A

flat sloped surface.

18
Q

What is a wedge?

A

Two inclined planes back to back that can move.

19
Q

What is a screw?

A

An inclined plane wrapped around a
cylinder.

20
Q

What are The three types of levers?

A
  1. First Class Lever
  2. Second Class Lever
  3. Third Class Lever
21
Q

What is Sound energy?

A

when you transmit energy though sound.Vibrating objects

22
Q

What is potential energy?

A

Stored energy.

23
Q

What is Kinetic energy?

A

Kinetic energy is the energy an object has because of its motion.

24
Q

What is chemical energy?

A

from chemical bonds

25
Q

What is electrical energy?

A

moving electrons

26
Q

What is mechanical energy?

A

moving things(parts)

27
Q

What is heat energy?

A

moving molecules

28
Q

What us nuclear energy?

A

From atoms nucleus

29
Q

what is light(solar) energy?

A

moving photons

30
Q

What are renewable Resources?

A

materials that can be replaced at the rate at which we use them.

31
Q

what are Nonrenewable Resources?

A

are materials that can not be replaced at the rate at which we use them.

32
Q

What are the types of energy?

A

1.Solar
2.heat
3. Nuclear
4. mechanical
5. electrical
6. chemical
7.Potential
8,kinetic

Science Flash Cards 7th grade (8 decks)

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