Mechanics Flashcards

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1
Q

Displacement

A

Distance in a direction

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2
Q

Speed

A

Rate of change of distance with respect to time

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3
Q

Velocity

A

Rate of change of displacement with respect to time

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4
Q

Acceleration

A

Rate of change of velocity with respect to time

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5
Q

Scalar Quantity

A

Magnitude only

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6
Q

Vector Quantity

A

Magnitude and direction

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7
Q

A Force

A

Causes Acceleration

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8
Q

The Newton

A

force which gives 1kg an acceleration of 1m/s

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9
Q

Friction

A

Is a force which opposes the relative motion between objects

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10
Q

Mass

A

Is a measure of how difficult it is to accelerate that body

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11
Q

Weight

A

The force of Earth’s gravity acting on an object

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12
Q

Momentum

A

Is the product of mass times velocity

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13
Q

Newton’s first law of motion

A

Every object will remain at rest or at a constant velocity unless and external force is applied

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14
Q

Newton’s second law of motion

A

the rate of change of and objects momentum is directly proportional to the force applied and is in the same direction

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15
Q

Newton’s third law of motion

A

Every action has and equal but opposite reaction

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16
Q

The principle of conservation of momentum

A

The total momentum after is equal to the total momentum before, provided no external forces are applied

17
Q

Density

A

An objects mass per unit volume

18
Q

Pressure

A

Force per unit area

19
Q

Archimede’s principle

A

when an object is placed in fluid the upthrust is equal to the weight of the displaced fluid

20
Q

Law of Floatation

A

The weight of a floating object is equal to the weight of the fluid it displaces

21
Q

Boyle’s law

A

at constant temperature the volume of a fixed mass of gas is inversely proportional to the pressure.

22
Q

Conditions for equilibrium

A

Vector sum of the forces in and direction is zero, the sum of the moments about any point is zero

23
Q

The moment of a force

A

the force multiplied by the perpendicular distance between the force and the fulcrum

24
Q

Work

A

Displacement by force

25
Q

Energy

A

the ability to do work

26
Q

The principle of conservation of energy

A

Energy cannot be created nor destroyed but can only be converted from one form to another

27
Q

Kinetic energy

A

the energy a body has due to its motion

28
Q

Potential energy

A

the energy a body has due to its position in a force field

29
Q

Power /work

A

the rate at which work is done

30
Q

Power /energy

A

The rate at which energy is converted from one form to another

31
Q

Angular Velocity

A

the change in angle with respect to time

32
Q

Centripetal force

A

the force acting in towards the centre required to keep and object moving in a circle

33
Q

Centripetal acceleration

A

when moving in a circle the acceleration it has towards the centre of the circle

34
Q

Hooke’s law

A

when an object is stretched the restoring force is directly proportional to the displacement

35
Q

Period of the orbit

A

the time taken for a satellite to go once around the central body