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GCSE Physics > P8 - Forces In Balance > Flashcards

P8 - Forces In Balance Flashcards

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1
Q

What is displacement?

A

Distance without a change in direction

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2
Q

What is a Vector?

A

Physical quantities with size (magnitude) AND direction

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3
Q

What is a scalar?

A

Physical quantities with size but NO direction

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4
Q

Wind blowing at 20 mph, vector or scalar?

A

Scalar

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5
Q

Car travelling east at 80 mph, vector or scalar?

A

Vector

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6
Q

Newton’s third law?

A

When two objects interact with each other they exert equal and opposite forces on each other.

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7
Q

Friction is….?

A

Friction is a force between two surfaces that are sliding, or trying to slide, across each other.

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8
Q

Definition of Weight?

A

The force of gravity pulling things downwards. It makes things fall, and keeps things on the ground.

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9
Q

Definition of Reaction?

A

It pushes things upwards when they are in a liquid. It pushes boats upward so that they do not sink.

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10
Q

Definition of Thrust?

A

A forward force, from an engine for example.

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11
Q

Definition of Air resistance?

A

It tries to stop things moving through the air. It pushes leaves and parachutes upwards so that they fall slowly.

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12
Q

Definition of Upthrust?

A

It stops things from going right through solid objects. When this force acts from your chair it pushes you upwards so that you do not fall through it.

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13
Q

Moment definition?

A

A turning effect of a force (Force x distance)

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14
Q

How to increase the moment?

A

Increase the force applied, or increase the perpendicular distance from the pivot.

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15
Q

2 types of force multipliers

A

Opposite side force multiplying levers and Same side force multiplying levers.

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16
Q

Moment of Gears

A

Force x gear radius

17
Q

Centre of mass

A

Centres of mass typically lie on lines (or planes) of symmetry of objects.

18
Q

Principle of moments

A

The sum of all the clockwise moments about any point = The sum of all the anticlockwise moments about that point

19
Q

How to find the horizontal and vertical components of a force.

A

Horizontal = Force x cos (angle)
Vertical = Force x sin (angle)

20
Q

How do you find the centre of mass of an irregular shape?

A

You would hang the shape, made out of card, from a thread with a plumb line attached to it and you will use a pencil and ruler to draw the line that the plumb line makes on the piece of card and rotate the card and repeat the process. The lines will all meet on one point, and that is the centre of mass

GCSE Physics (2 decks)

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