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Physics > Mechanics > Flashcards

Mechanics Flashcards

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1
Q

Scalar

A

Has no direction just amount of something

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2
Q

Vector

A

Has magnitude and direction

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3
Q

Scale drawing method

A

Make a scale drawing of two vectors, draw resultant vector and measure length and angle

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4
Q

Horizontal component

A

VCos@=Vx

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5
Q

Vx

A

VCos@

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6
Q

Vertical component

A

VSin@=Vy

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7
Q

Vy=

A

Vy=VSin@

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8
Q

Formula for resolving forces

A

FH/F=Cos@ or FH=FCos@

FV/F=sin@ or FV=FSin@

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9
Q

Principle of moments

A

For a body to be in equilibrium the sum of the clockwise moment about any point equals the sum of the clockwise moments about the same point

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10
Q

A couple

A

A pair of forced of equal size which act parallel to each other in opposite directions

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11
Q

Inertia

A

Greater mass of an object the greater its resistance to a change in velocity

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12
Q

Centre of mass

A

Single point that you can consider its weight to act through

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13
Q

Displacements

A

How far an objects travelled from starting point in given direction

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14
Q

Free fall

A

Motion of an object undergoing an acceleration of g

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15
Q

Newton’s First law

A

Velocity of an object will not change unless a resultant force acts on it

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16
Q

Newton’s Second Law

A

More force you have acting on a mass, the more acceleration you get

17
Q

Newton’s third law

A

If an object exerts a force on object B, then object B exerts an equal but opposite force on object a

18
Q

Instantaneous velocity

A

Draw tangent to curve at that point and find gradient

19
Q

Average velocity

A

Divide total change in displacement by the total change in time

20
Q

Free fall

A

Motion of an object undergoing an acceleration of g

21
Q

Frictional forces

A

Always act opposite to motion
Never speed things up
Convert kinetic energy into Heat and sound

22
Q

Lift

A

Upwards force on an object through a fluid

23
Q

Elastic collision

A

Collision where momentum and kinetic energy are conserved

24
Q

Inelastic collision

A

Some kinetic energy converted into other forms but momentum conserved

25
Q

Newton’s 2nd law In momentum

A

Force is equal to rate of change in momentum

Rate of change in momentum directly proportional to resultant force F^t=^(mv)

26
Q

Impulse

A

Force x Time
Ns
Equal to change in momentum

27
Q

Work done

A

The amount of energy transferred

28
Q

Power

A

The rate of energy transfer

29
Q

Energy

A

Capacity or power to do work

Physics (8 decks)

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