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GCSE physics > P8 > Flashcards

P8 Flashcards

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1
Q

What is a moment

A

The turning effect of a force

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2
Q

List two wats you can increase a moment

A

Increase the distance or the force

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3
Q

What are the units for moments

A

Mainly Nm (Newton meters)

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4
Q

How do you work out the moments

A

Force(N) x distance(m)

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5
Q

What is the centre of mass of an object

A

It is the point at which its mass can be thought of as being concentrated

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6
Q

How do you work out the moment of gears

A

Force x gear radius

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7
Q

Name some contact forces

A

Friction
Air resistance
Tension
Thrust

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8
Q

Name some non-contact forces

A

Gravitational
Magnetic
Nuclear
Electrostatic

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9
Q

What is a scaler

A

A scaler has physical quantities with size but NO direction

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10
Q

What is a vector

A

A vector has physical quantities with size AND direction

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11
Q

Examples of vectors

A

Acceleration
Force
Weight

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12
Q

Examples of scalers

A 
Distance 
Speed 
Time 
Power 
Mass 
Energy
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13
Q

What is displacement

A

Displacement is distance without a change in direction

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14
Q

What is a force

A

A force is a push or a pull that acts on a object.

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15
Q

What is force measured in

A

Newtons (N)

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16
Q

What can a force do

A

Can change shape, change its motion and change its state of rest

17
Q

What is a contact force?

A

They are forces that act between two object that are physically touching each other.

18
Q

What happens when a contact force acts between two objects?

A

Both objects experience the same size force, but in opposite directions.

19
Q

What are non-contact forces?

A

Forces that act between two objects that are not physically touching each other.

20
Q

Weight and mass are

A

Directly proportional

21
Q

What is an objects centre of mass?

A

The point representing the mean position of the matter in a body (the single point at which weight is acting)

GCSE physics (2 decks)

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