Physics Flashcards

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1
Q

Braking distance

A

The distan d travelled by a vehicle during the time it takes for its brakes to act

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2
Q

Conservation of momentum

A

in a closed system, the total momentum before an event is equal to the total momentum after the event. Momentum is conserved in any collision or explosion, provided no external forces act on the objects that collide or explode

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3
Q

Directly peoportional

A

a graph will show this if the line of best fit is a straight line through the origin

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4
Q

Elastic

A

a material is elastic if it is able to regain its shape after it has been squashed or stretched

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5
Q

Extension

A

the increase in length of a spring (or a strip of material) from its original length

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6
Q

Gravitational field strength

A

the force of gravity on an object of mass 1 kg (in newtons per kilogram, N/kg). It is also the acceleration of free fall

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7
Q

Inertia

A

the tendency of an object to stay at rest or to continue in uniform motion

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8
Q

Limit of proportionality

A

The limit of Hookes law applied to the extension of a stretched spring

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9
Q

Mass

A

the quantity of matter in an object – a measure of the difficulty of changing the motion of an object (in kilograms,

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10
Q

Momentum

A

This equals mass (in kg) x velocity (in m/s)

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11
Q

Newtons

A

the acceleration of an object is proportional to the resultant force on the object, and inversely proportional to the mass of the object

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12
Q

Stopping distance

A

the distance travelled by the vehicle in the time it takes for the driver to think and brake

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13
Q

The terminal velocity

A

the velocity reached by an object when the drag force on it is equal and opposite to the force making it move

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14
Q

Thinking distance

A

the distance travelled by the vehicle in the time it takes the driver to react

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15
Q

Weight

A

the force of gravity on an object (in newtons, N)

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