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AS Physics Roedean > Mechanics definitions > Flashcards

Mechanics definitions Flashcards

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1
Q

speed

A

rate of change of distance

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2
Q

velocity

A

rate of change of displacement

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3
Q

displacement

A

vector measurement of distance in a certain direction

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4
Q

Vector

A

A quantity with magnitude and direction

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5
Q

Scalar

A

A quantity with magnitude only

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6
Q

Average speed

A

Total distance / total time taken

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7
Q

Instantaneous speed

A

The speed at any particular time on a journey

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8
Q

Acceleration

A

The rate of change of velocity

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9
Q

Displacement-time graph

A

A graph showing the positions visited on a journey (displacement on the y-axis and time on the x-axis)

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10
Q

Velocity-time graph

A

A graph showing the velocities on a journey (velocity on the y-axis and time on the x-axis)

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11
Q

Resultant force

A

The total force acting on a body when all the forces acting are added together accounting for their directions

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12
Q

Free-body force diagram

A

A diagram where all the forces acting are drawn on at the points where they act

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13
Q

Equilibrium

A

A body is in equilibrium if there is zero resultant force and zero resultant moment

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14
Q

Principle of moments

A

body will be in equilibrium if the sum of the clockwise moments acting on it is equal to the sum of the anticlockwise moments

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15
Q

Centre of gravity

A

The point through which the weight of an object appears to act

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16
Q

Newton’s first law of motion

A

An object will remain at rest, or in a state of uniform motion, until acted on by a resultant force

17
Q

Newton’s second law of motion

A

an objects mass is constant the resultant force needed to cause an acceleration is given by: F = ma

18
Q

Newton’s third law of motion

A

For every action there is an equal and opposite reaction

19
Q

Kinematics

A

The study of the description of motion of objects

20
Q

Uniform motion

A

Motion when there is no acceleration

21
Q

Resolving a vector

A

Determination of a pair of vectors at right angles to each other

22
Q

Projectile

A

A moving object on which the only force acting is gravity

23
Q

Component

A

A part of a vector quantity in a certain direction (usually horizontal or vertical).

AS Physics Roedean (1 decks)

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