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Physics > Mechanics 1 > Flashcards

Mechanics 1 Flashcards

1
Q

Vectors and Scalars

A

Vectors have both magnitude and direction

Scalars have magnitude only

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2
Q

Displacement

A

Distance travelled in a particular direction

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3
Q

Speed

A

Distance/time

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4
Q

Velocity

A

Displacement/time

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5
Q

Acceleration

A

Final-initial velocity/time

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6
Q

Ticker tape timer formula

A

S/0.02 x number of spaces

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7
Q

g is negative when..

g is positive when..

A

Moving up

Moving down

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8
Q

Experiment to measure acceleration due to gravity graph

A

/
2s|_____. /
t^2

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9
Q

Newton’s 1st law

A

A body continues in a state of rest or uniform motion in a straight line unless a resultant external force acts on it

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10
Q

Friction
Benefits
Nuisances

A

Force that opposes the relative motion of 2 objects in contact
Allows car breaks to stop the car
Causes wearing in machines

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11
Q

Momentum

A

m x v

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12
Q

Inertia

A

Refusal of an object to change their state of motion

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13
Q

State Newton’s 2nd law and show how it leads to F=ma

A

The rate of change of the momentum of a body is proportional to the force that acts on it
Force proportional to rate of change of momentum
F proportional mv-mu/t
F proportional m(v-u/t)
F proportional ma
F=k x ma
F=ma

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14
Q

Show acceleration is proportional to force graph

A

N| /
|______. /
a

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15
Q

Newton’s 3rd law

A

To every action there is an equal and opposite reaction

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16
Q

Law of conservation of momentum

A

m1u1+m2u2=m1v1+m2v2 (in a closed system)

Or

When 2 or more bodies interact in a closed system the total momentum of bodies before interaction equals total momentum of bodies after interaction

17
Q

Work

A

Force times displacement
Joules

1J=1N x 1m

18
Q

Energy

Conservation of energy

A

Ability to do work

Energy cannot be created or destroyed but can be changed from one form to another

19
Q

Kinetic energy

Potential energy

A

Energy an object has due to its motion

Energy an object has due to its position shape or size

20
Q

Power

A

Rate at which work is done
Watt
1W=1J/1s

21
Q

Renewable sources of energy

Non renewable sources of energy

A

Hydroelectricity, wind energy, solar energy, biomass

Oil, gas, turf, coal

Physics (5 decks)

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