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Lower Sixth Physics > Mechanics > Flashcards

Mechanics Flashcards

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1
Q

List the suvat equations

A

v=u +at
s=(u+v)/2 t
s=ut + 1/2a*t^2
v^2=u^2 + 2as

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2
Q

What is a free body diagram

A

a free body diagram whoch shows all the forces that act on an object

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3
Q

what is netwon’s first law

A

an object will remain at rest or travelling at a constant velocity, until it experiences a resultant force

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4
Q

what is newton’s second law

A

F=ma
the acceleration of an object is proportional to the resultant force experienced by the object
MASS MUST STAY CONSTANT if the other two is known

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5
Q

how to prove N1L using N2L

A

if resultant force is 0 and acceleration is 0
F=0
a=0
0=m*0
0=0

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6
Q

how does terminal velocity occur

A

when the frictional forces acting on an object and the driving forces are equal, so no resultant, no acceleration, so it travels at constant velocity

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7
Q

what is newton’s third law

A

for each force experienced by an object, the object exerts an equal and opposite force (reaction forces)

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8
Q

equation for momentum

A

momentum = mass * velocity

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9
Q

unit for momentum

A

kg m s^-1

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10
Q

what is the principle of conservation of linear momentum

A

momentum is always conserved in any interaction where forces act.
momentum before = momentum after

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11
Q

how does force and momentum link

A

force is the rate of change of momentum

F=change in momentum/change in time period

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12
Q

equation for moment

A

moment = force * perpendicular distance from pivot

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13
Q

what is the principle of moments

A

sum of anticlockwise moments = sum of clockwise moments ,when there is no external forces acting upon it

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14
Q

what is the centre of gravity

A

the point which the gravity appears to act

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15
Q

where does the weight act upon the object

A

the centre of gravity

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16
Q

formula for work done (linear)

A

W.d. = force * distance

17
Q

formula for work done (trig)

A

W.d. = force * distance * cos θ

18
Q

what is kinetic energy

A

the energy that an object has due to its motion

19
Q

what is gravitational potential energy

A

the energy that an object has due to its position in a gravitational field

20
Q

what is the principle of conservation energy

A

energy can not be created or destroyed
total energy in a closed system stays constant

21
Q

what is power

A

the rate of energy transfer

22
Q

alternative formula for power

A

Power = force * velocity

P = W/t
P = (Fd)/t
P = Fv

23
Q

What is impulse

A

change in momentum

24
Q

impulse in force time graph

A

area under graph

25
Q

energy in elastic collisions

A

all kinetic energy is conserved

26
Q

What must always be true when using the SUVAT equations of motion?

A

The acceleration must be uniform - if the acceleration is changing, the equations are not valid.

27
Q

What does the gradient of a distance-time graph represent?

A

Speed

28
Q

What does the gradient of a displacement-time graph represent?

A

Velocity

29
Q

What does the gradient of a velocity-time graph represent?

A

Acceleration.

30
Q

Describe the shape of a velocity-time graph for an object travelling with uniform acceleration.

A

If acceleration is constant, the gradient of the velocity-time graph will be constant and so it will form a straight line graph.

31
Q

Describe the shape of a velocity-time graph for an object travelling with non-uniform acceleration.

A

If acceleration is not constant, the gradient of the velocity-time graph will change and so it will form a curve.

32
Q

Compare the velocity-time graphs for a uniformly accelerating and a uniformly decelerating object.

A

● For an accelerating object, the gradient will be positive
● For a decelerating object, the gradient will be negative

33
Q

Give five examples of scalar quantities.

A
  1. Distance
  2. Speed
  3. Mass
  4. Energy
  5. Temperature
34
Q

Give five examples of vector quantities.

A
  1. Displacement
  2. Velocity
  3. Acceleration
  4. Momentum
  5. Force
35
Q

How is a vector quantity represented on a diagram?

A

● As an arrow
● The direction of the arrow represents the direction of the quantity
● The length of the arrow represents the magnitude of the quantity

Lower Sixth Physics (13 decks)

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