Forces Flashcards

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1
Q

what is inertia?

A

The tendency of an object to continue at in its current state (at rest or uniform motion)

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2
Q

what is newton’s second law?

A

It states that Force=mass x acceleration

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3
Q

what is newton’s third law?

A

when two object interact they exert equal and opposite forces on each other

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4
Q

what is a vector quantity?

A

a quantity with magnitude and direction

e.g. force, velocity

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5
Q

what is newton’s first law?

A

an objects stays stationary or moves at a constant speed when the resultant force is 0

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6
Q

what is a scalar quantity?

A

a quantity with only magnitude

e.g. speed, distance

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7
Q

what is a non-contact force?

A

when the object doesn’t need to be touching for a force to act

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8
Q

what is a contact force?

A

forces that require contact to act

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9
Q

what is stopping distance?

A

thinking distance + braking distance

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10
Q

when is work done?

A

when a force is applied to an object

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11
Q

what are examples of contact forces?

A

> friction
reaction force
tension

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12
Q

what are examples of contact forces?

A

> gravitational
electrostatic
magnetic

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13
Q

what are the factors affecting braking distance?

A

> speed of car
wet or icy road
poor conditions of tyres

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14
Q

what is thinking distance?

A

distance car travels between when the driver realises they need to brake and when they apply them

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15
Q

what are factors affecting thinking distance?

A

> drugs and alcohol
tiredness
mobile phone

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16
Q

what is weight?

A

force acting on an object due to gravity

17
Q

What is mass?

A

The amount of stuff in an object

18
Q

What happens when a skydiver falls?

A

> at first gravity is much more than the frictional force so it slows down
as the speed increases the air resistance increases
reduces acceleration until air resistance=weight
it will have reached its terminal velocity

19
Q

What is the formula for resultant force?

A

Acceleration x mass

20
Q

What is the formula for momentum?

A

Mass x velocity