# MOTION AND FORCES EDEXCEL

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what is a vector quantity?

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### 20 Terms

1

what is a vector quantity?

a quantity with magnitude and a direction.

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2

what is speed?

distance travelled per unit time

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3

is speed a scalar or a vector quantity?

scalar

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4

what is velocity?

speed in given direction

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5

what does area under velocity time graph show?

distance

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6

what is weight?

the pull of gravitational force on an object

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7

what is friction?

force that opposes motion

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8

state hooke’s law

extension is directly proportional to the force applied until the limit of proportionality is reached

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9

state the principle of moments

clockwise moment is equal to anticlockwise moment in a closed system

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10

what is centre of mass?

the point at which the weight of the object acts.

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11

state Newton's first law

An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

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12

state Newton's second law

Force (F) = mass (m) x acceleration (a)

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13

state newton’s third law

Every action has an equal and opposite reaction.

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14

The lower the centre of mass of an object

the greater the stability.

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15

The greater the base area of an object

the greater the stability.

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16

what is air resistance?

it is a frictional force that opposes motion in air. It slows down anything travelling through the air and may also cause the object to heat up.

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17

what is acceleration?

Acceleration is the rate of increase in velocity with time.

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18

what is stopping distance?

Stopping distance is the total distance covered by a vehicle from the moment the driver perceives a hazard until the vehicle comes to a complete stop.

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19

what is momentum?

Momentum is a measure of how difficult it is to stop something that is moving.

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20

what is momentum?

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