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Physics > MECHANICS > Flashcards

MECHANICS Flashcards

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1
Q

Centre of mass

A

The single point through which all the mass of an object acts.

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2
Q

Conservation of energy

A

Energy cannot be created or destroyed - only transferred into different forms

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3
Q

Conservation of momentum

A

Momentum before = momentum after

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4
Q

Couple

A

Two equal and opposite parallel forces that act on an object through different lines of action, causing rotation

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5
Q

Density

A

Mass per unit volume

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6
Q

Equillibrium

A

The resultant force and resultant moment acting on the object must be zero

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7
Q

Impulse

A

The change of momentum of an object when a force acts on it. Force * time

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8
Q

Moment

A

The product of a force and perpendicular distance from the line of action to the force

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9
Q

Momentum

A

Product of an object’s mass and velocity

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10
Q

Newton’s 1st Law

A

An object will remain in constant motion or equilibrium until acted on by a resultant force

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11
Q

Newton’s 2nd Law

A

The sum of forces acting on an object is equal to rate of change of momentum of the object.

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12
Q

Newton’s 3rd Law

A

Every force has an equal and opposite reaction force

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13
Q

Terminal speed

A

The maximum speed of an object that occurs when the resistive and driving forces are equal

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14
Q

Angular speed

A

A measure of the speed of an object’s angular rotation

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15
Q

Centripetal acceleration

A

Acceleration of an object moving in a circle

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16
Q

Centripetal force

A

The resultant force responsible for keeping an object in circular motion, acts towards the centre of the circle

17
Q

Critical damping

A

Damping that reduces the displacement of an oscillating object in the quickest time possible without further oscillation.

18
Q

Damping

A

Dissipation of energy from an oscillating system.

19
Q

Forced vibrations

A

Repeated up and down vibrations, at the frequency of a driver. The amplitude of oscillation is small at high frequencies and large at low frequencies

20
Q

Free vibrations

A

Vibrations not caused by a driver. An object will naturally oscillate at its natural frequency

21
Q

Overdamping

A

A type of damping where the system is damped more than necessary, and so it takes longer for it to return to equilibrium position

22
Q

Resonance

A

When the frequency of oscillations is equal to the natural frequency of an oscillating frequency. The rate of energy transfer is at a maximum during resonance

23
Q

Simple harmonic motion

A

Motion where the acceleration of an object is directly proportional and opposite to the displacement

24
Q
A

Physics (10 decks)

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