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A Level Physics > Mechanics > Flashcards

Mechanics Flashcards

1
Q

What is the Symbol and Units of Displacement?

A

Symbol: S
Units: m

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2
Q

What is the Symbol and Units of Initial Velocity?

A

Symbol: u
Units: ms^-1

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3
Q

What is the Symbol and Units of Final Velocity?

A

Symbol: v
Units: ms^-1

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4
Q

What is the Symbol and Units of Acceleration?

A

Symbol: a
Units: ms^-2

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5
Q

What is the Symbol and Units of Time?

A

Symbol: t
Units: s

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6
Q

What is the gradient of a Displacement-Time graph?

A

Velocity

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7
Q

What is the gradient of a Velocity-Time graph?

A

Acceleration

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8
Q

What is the area of a Velocity-Time graph?

A

Displacement

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9
Q

What is the area under an Acceleration-Time graph?

A

Velocity

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10
Q

What are the five SUVAT equations?

A 
v = u+at
s = vt-0.5at²
s = ut+0.5at²
s = t(u+v)/2
v² = u²+2as
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11
Q

When are SUVAT equations applicable?

A

When the acceleration is constant

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12
Q

What is Projectile Motion?

A

It is a simplified way to understand and calculate the motion of an object.
It models horizontal and vertical motion as independent

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13
Q

What is assumed with Projectile Motion?

A

Air ressistance is ignored
It is in a uniform field
The initial velocity is imparted instantaneously
Vertical and horizontal motion is independent

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14
Q

What is Newton’s First Law of Motion?

A

An object will remain at rest or continue to move with a constant velocity, unless acted upon by a resultant force.

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15
Q

What is the Resultant Force?

A

The Overall force acting upon an object

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16
Q

What is Newton’s Second Law of Motion?

A

The force acting on an object is product of the mass and the acceleration

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17
Q

What is Newton’s Second Law of Motion as an equation?

A

F = ma

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18
Q

What is Newton’s Third Law of Motion?

A

Every action has an equal and opposite reaction acting upon a different object.

19
Q

When is Newton’s Third Law of Motion true?

A

It is true for all situations

Not just equilibrium

20
Q

What is Terminal Velocity?

A

It is the constant speed reach in free fall

21
Q

When is Terminal Velocity reached?

A

When Weight = Ressistance

22
Q

What is the equation the links Work Done, Force and Displacement?

A

Work Done = Force x Displacement in direction of the force

w = Fs

23
Q

Is Work Done Scalar or Vector?

A

Scalar

24
Q

What is the equation for Kinetic Energy?

A 
Energy = 0.5 x Mass x Velocity²
E = 0.5mv²
25
Q

What is Kinetic Energy proportional to?

A

E ∝ m

E ∝ v²

26
Q

What is the equation for change in Gravitational Potential Energy?

A 
Energy = Mass x Gravitaional Field Strength x Change in height
E = mgΔh
27
Q

Define Power?

A

The rate of work done
Or
The rate of energy transfer

28
Q

What is the Symbol and Units of Power?

A

Symbol: P
Units: W

29
Q

What is the equation that links Power, Force and Velocity?

A 
Power = Force x Velocity
P = fv
30
Q

What is the equation that links Power, Work Done and Time?

A

P = w/t

31
Q

Define Efficiency?

A

The ration of Useful Output Power to Total Input Power

32
Q

What is the equation of Efficiency?

A

(Useful Output Power / Input Power) x 100
Or
(Useful Output Energy / Input Energy) x 100

33
Q

What is the equation for Momentum?

A 
Momentum = Mass x Velocity
p = mv
Momentum = Force x Time
p = Ft
34
Q

What is the Symbol and Units of Momentum?

A

Symbol: p
Units: Ns

35
Q

What is an Elastic Collision?

A

A collision where no energy is lost

36
Q

What is an Inelastic Collision?

A

A collision where energy is lost

37
Q

What is Change in Momentum?

A

Impluse

38
Q

What are the equations for Impulse?

A

Change in Momentum = Force x Change in Time
Δp = FΔt

Change in Momentum = Mass x Change in Velocity
Δp = mΔv

39
Q

What is the area under a Force-Time graph?

A

Impulse

40
Q

For an object to be in Static Equilibrium it has to what?

A

Have no resultant force

Therefore no acceleration

41
Q

What is the Moment of a Force?

A

The rotaional force acting on an object

42
Q

What is the Symbol and Units of Moment of Force?

A

Symbol: T
Units: Nm

43
Q

What is the equation for calculating a Moment of a Force?

A 
Moment = Force x Perperndicular distance between force and pivot
T = Fm
44
Q

What does the Principle of Moments state?

A

If a body is in rotaional equilibrium, the total clockwise moment is equal to the total anticlockwise moment
Σ↻ = Σ↺

A Level Physics (16 decks)

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