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LC Physics > Mechanics > Flashcards

Mechanics Flashcards

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0
Q

Scalar

A

A quantity which has magnitude only

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1
Q

Vector

A

A quantity which has magnitude and direction

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2
Q

Displacement

A

The separation between two points in a given direction

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3
Q

Distance

A

A measure of the separation between two points

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4
Q

Speed

A

The distance travelled per unit of time

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5
Q

Velocity

A

The rate of change of displacement

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6
Q

Acceleration

A

The rate of change of velocity in respect to time

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7
Q

The principle of conservation of momentum

A

In a closed system, momentum before= momentum after

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8
Q

Force

A

That which changes or tends to change the velocity of an object

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9
Q

Weight

A

The force with which a mass is attracted to a planet

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10
Q

Friction

A

The force that opposes motion between two surfaces in contact

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11
Q

Newton’s first law of motion

A

A body remains at rest or in uniform motion unless acted on by a resultant

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12
Q

Newton’s second law of motion (words)

A

The rate of change of momentum is directly proportional to the applied force and takes place in the same direction in which the force acts

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13
Q

Newton’s third law of motion

A

For every action there is an equal and opposite reaction

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14
Q

Lever

A

Any rigid body that can rotate about a fixed point called a fulcrum

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15
Q

The centre of gravity

A

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

16
Q

Conditions for equilibrium

A
  1. The forces up= the forces down

2. The sum of the moments about any point must be zero

17
Q

A Couple

A

Two equal parallel forces that act in opposite directions.

18
Q

Archimedes’ principle

A

The upthrust= the weight of fluid displaced

19
Q

Law of floatation

A

A floating body displaces its own weight of fluid

20
Q

Boyle’s law

A

For a fixed mass of gas at constant temperature, its volume is inversely proportional to its pressure

21
Q

The moment of a force/couple

A

M/T=Fd
F= force
d= distance
T= torque (couple)

22
Q

Friction

A

The force that opposes motion between two surfaces in contact

23
Q

Energy

A

The ability to do work

24
Q

Joule

A

The work done when 1N displaces an object by 1m

25
Q

Watt

A

W=J/s

26
Q

The efficiency of a machine

A

The energy output as a percentage of energy input

27
Q

Simple harmonic motion

A

Motion where an objects acceleration is directly proportional to its displacement from a mean position and always directed towards it

28
Q

Periodic time

A

The time taken to complete one revolution

29
Q

Equation for periodic time

A

T= 2pieR/v

30
Q

Mass

A

The measurement of how difficult it is to accelerate a body

31
Q

Newtons second law of motion (equation deriving)

A

F= Mv-Mu/ T

LC Physics (10 decks)

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