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Physics > Mechanics (OL) > Flashcards

Mechanics (OL) Flashcards

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1
Q

Displacement

A

The distance from a fixed point in a given direction

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2
Q

Velocity

A

Rate of change of displacement

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3
Q

Acceleration

A

Rate of change of velocity

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4
Q

What does SUVAT stand for

A

S- displacement U- initial velocity V- final velocity A- acceleration T- time

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5
Q

Equation to find velocity

A

V=u+at

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6
Q

Equation to find displacement

A

S=ut+1/2at2(squared)

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7
Q

How do you calculate the distance travelled on a distance time graph

A

The area under the curve

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8
Q

Scalar

A

Physical quantity with magnitude only e.g. time

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9
Q

Vector

A

quantity with magnitude and distance e.g. displacement

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10
Q

Momentum (p)

A

Mass x force

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11
Q

Principal of conservation of momentum

A

If there are no external forces, total momentum before collision= total momentum after collision

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12
Q

Gravity

A

Fundamental force of attraction between any two bodies

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13
Q

Friction

A

A force that opposes relative motion between two bodies in contact

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14
Q

Weight

A

The force of gravity acting on an object

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15
Q

Newton’s first law of motion

A

Every object stays at rest or uniform motion in a straight line, unless an external force acts on it

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16
Q

Newton’s second law of motion

A

The rate of change of momentum is directly proportional to the force , and takes place in the direction of the force

17
Q

Newton’s third law of motion

A

For every action there is an equal and opposite reaction

18
Q

Rate of change of momentum

A

Final momentum. - initial momentum
——————————-
Time

19
Q

Impulse

A

Product of Force x time

20
Q

Newton’s law of universal gravitation

A

The force of attraction between any two bodies is directionally proportional to the product of their masses and inversely proportional to the square of the distance between them.

F ~ m1m2
———-
d2

21
Q

Weightlessness

A

Falling freely under gravity

22
Q

Work (J)

A

Force x displacement

23
Q

Energy (J)

A

Ability to do work

24
Q

Power (W)

A

Energy
————
Time

Or

Work done
——————
Time

25
Q

Potential energy (Pe)

A

mgh

26
Q

Kenetic energy (Ke)

A

1/2 mv2(squared)

27
Q

Moment of a force

A

Force x perpendicular distance from the fulcrum to the force

T=FxD_|_

28
Q

Principle of moments

A

When a body is in equilibrium

Clockwise moments=Anti-clockwise moments

29
Q

Laws of equilibrium 1

A

The principle of moments must hold

30
Q

Principle of moments 2

A

Forces up=forces down

31
Q

A couple

A

A pair of equal but opposite forces

32
Q

A moment of a couple

A

Force x distance between them e.g. bike handles, to turn left u must move the right handle anti-clockwise and left handle must move anti-clockwise

Physics (3 decks)

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