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GCSE Physics > P10 Force And Motion > Flashcards

P10 Force And Motion Flashcards

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1
Q

Force =

A

Mass x acceleration

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2
Q

Newton’s second law

A

The acceleration of an object is proportional to the resultant force on the object and inversly proportional to the mass of the object

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3
Q

Inertia

A

The tendency of an object to oppose a change of state of motion.

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4
Q

Inertial mass =

A

Force / acceleration

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5
Q

1 kg =

A

10 N

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6
Q

Weight =

A

Mass x gravitational field strength

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7
Q

Terminal velocity

A

The maximum speed of an object, reached when the forces moving the object are balanced by its frictional forces.

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8
Q

Stopping distance =

A

Thinking distance + braking distance

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9
Q

Thinking distance

A

The distance travelled in the time it takes for the driver to react. Thinking distance = speed x reaction time

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10
Q

Braking distance

A

The distance travelled by the vehicle during the time the braking force acts

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11
Q

Deceleration =

A

v² = u² + 2as

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12
Q

How to calculate braking force

A

F=ma

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13
Q

Momentum (p) =

A

Mass (m) x velocity (v)

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14
Q

Unit for momentum

A

Kg m /s

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15
Q

Momentum is a _________ quantity

A

Vector

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16
Q

Conservation of momentum

A

In a closed system, the total momentum before the event is equal to the total momentum after the event

17
Q

The longer the impact time…

A

The more the impact force is reduced

18
Q

Impact force=

A

(Mass x change of velocity) / time

19
Q

What do car safety features such as crumple zones and side bars do?

A

They increase the impact time and so reduce the impact force on the car

20
Q

How do helmets and cusioned surfaces ensure safety?

A

They reduce impact force by increasing the impact time

21
Q

How do seat belts and air bags ensure safety?

A

They spread the force across the chest and increase the impact time

22
Q

What is an elastic object?

A

An object that returns to its original shape when the forces deforming it have been removed

23
Q

What is extension?

A

The increase of length from the original

24
Q

A straight line going through the origin on a weight-extension graph represents?

A

The weight is directly proportional to the extension of the spring

25
Q

Hooke’s law

A

The extension of a spring is directly proportional to the force applied, as long as its limit of proportionality is not exceeded

26
Q

Hooke’s law equation

A

F = k x e

27
Q

Unit for spring constant

A

N/m

GCSE Physics (7 decks)

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