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Science Year 8 > Physics > Flashcards

Physics Flashcards

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1
Q

List 3 things a force can do

A

Push
Pull
Twist

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2
Q

Describe the difference between a contact force and a non-contact force.

A

Contact forces have friction and air resistance whereas non-contact forces have gravity.

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3
Q

State the unit of force

A

Newtons(N)

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4
Q

Forces come in pairs. What are they called?

A

Interaction pairs.

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5
Q

What piece of equipment is used to measure force?

A

A newton meter

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6
Q

State 2 things that friction does.

A

Creates drag and grips objects

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7
Q

Describe how friction helps you walk.

A

As you walk, the friction between your foot and the road produces your body to move forward.

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8
Q

Suggest why the hinges on a door need to be lubricated.

A

So that the door opens and closes smoothly and doesn’t creak.

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9
Q

When 2 objects are smooth, is the friction stronger or weaker?

A

Weaker.

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10
Q

When 2 objects are rough, is the friction stronger or weaker?

A

Stronger

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11
Q

What does deformation mean?

A

To deform an object, means to change its shape.

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12
Q

What does tension mean?

A

When objects are stretching, they are causing tension.

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13
Q

What is compression?

A

When forces squash an object, they are causing compression.

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14
Q

What is work done?

A

Work done is when a force moves an object

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15
Q

What is the equation for work done?

A

Work done= force x distance
Joules= newtons x meters.

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16
Q

What is conservation of energy?

A

When energy cannot be created or destroyed

17
Q

Describe work?

A

A method of energy transfer

18
Q

Simple machine is?

A

Makes it easier to lift, move or turn things.

19
Q

Levers are?

A

Allows you to apply a bigger force/ a bigger force multiplier.

20
Q

A gear is?

A

Can be used to increase force, change direction or go faster.

21
Q

What are pulleys?

A

a) one pulley can change the direction of a force
b) a pulley system multiplies your input force.
c) but the distance you pull is further than the object moves.

22
Q

What are wheels and gears?

A

a) they are simple machines.
b)they reduce friction between the ground and the moving surface.

23
Q

What is a moment?

A

A moment is a force that turns. A turning force acts in a certain distance from a pivot. A turning effect of a force is called a moment. The moment depends on the size of the force applied and how far it is from the pivot.

24
Q

What is the equation for moment?

A

Moment = force x distance

25
Q

Name the parts of a transverse wave

A

A) crest / peak
B) trough
C) wavelength
D) amplitude

26
Q

Name the types of waves

A

Radio waves
Microwaves
Infra-red
Visible light
Ultra-violet
X-ray
Gamma-ray

27
Q

What is reflection?

A

Relflection is caused when objects do not absorb light e.g. mirror reflect a lot of light and absorb very little.

Science Year 8 (1 decks)

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