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GCSE Physics > Topic 9 - Forces And Their Effects > Flashcards

Topic 9 - Forces And Their Effects Flashcards

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1
Q

What is a force?

A

Push or pull acting on an object due to an interaction with another object

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2
Q

What are the 2 categories that all forces can be split into?

A

Contact forces

Non contact forces

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3
Q

Give 3 examples of contact forces

A

Friction
Air resistance
Tension

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4
Q

Give 3 examples of non contact forces

A

Gravitational forces
Electrostatic forces
Magnetic forces

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5
Q

Is force a vector or scalar quantity? Why?

A

Vector

Has both magnitude and direction

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6
Q

What is a scalar quantity?

A

A quantity that only has a magnitude

Isnt dependant on direction

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7
Q

What is a vector quantity?

A

Quantity that has both magnitude and direction

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8
Q

3 examples of vector quantities

A

Velocity
Displacement
Force

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9
Q

3 examples of scalar quantities

A 
Temperature
Mass
Time
Speed
Distance
Energy
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10
Q

How are vectors represented?

A

Vector arrows
Length shows magnitude
Arrow shows direction

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11
Q

How can you calculate the resultant magnitude and direction of forces using a vector diagram?

A

Draw 2 forces as scaled arrows, joined tip to tail
Draw line connecting two open ends
Measure length of line and covert into magnitude
Measure angle of between line and one of other lines to find direction

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12
Q

What is an alternative name for the turning effect of a force?

A

A moment

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13
Q

State the equation used to calculate the moment of a force + units

A

Moment = force x distance

Nm) (N) (m

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14
Q

What distance measurement is used when calculating a moment?

A

Perpedicular distance from pivot to line of action of force

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15
Q

If an object is in equilibrium, what can be said about the moments acting on the object?

A

Clockwise moments are equal to anticlockwise moments

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16
Q

How do levers make use of moments?

A

Increase perpendicular distance of force from pivot

So decrease force needed to produce the same moment

17
Q

Why would an object not rotate?

A

The clockwise and anticlockwise moments are equal so object remains in equilibrium

18
Q

How are levers used to decrease force required to lift something?

A

Levers use pivot point and concept of movements to reduce force.
Further you are away from pivot pt, less force needed to lift object

19
Q

How does lubricating gears/levers improve efficiency?

A

Less resistance so less energy is wasted/dissipated (as heat) overcoming frictional forces

GCSE Physics (6 decks)

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