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Physics Paper 1 > Mechanics > Flashcards

Mechanics Flashcards

1
Q

What is the word equation for speed?

A

Speed = distance / time

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2
Q

What is the symbol equation for speed?

A

v = d / t

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3
Q

What is the equation for velocity?

A

v = s / t
velocity = changed in DISPLACEMENT / time

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4
Q

What is a scalar quantity?

A

A quantity with magnitude ONLY

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5
Q

What is a vector quantity?

A

A quantity with BOTH magnitude AND direction

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6
Q

What is velocity measured in?

A

ms^-1

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7
Q

Define acceleration?

A

The rate of change of velocity

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8
Q

What is the equation for acceleration?

A

a = (v-u) / t
acceleration = change in velocity / time

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9
Q

What is acceleration measured in?

A

ms^-2

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10
Q

How is average speed calculated?

A

Total distance / total time

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11
Q

What is instantaneous speed?

A

The speed at any particular instant in time of a journey

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12
Q

How can instantaneous speed be found?

A

The gradient of a distance - time graph

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13
Q

What is the symbol used for displacement?

A

s

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14
Q

What is the symbol used for distance?

A

d

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15
Q

What is the symbol used for speed?

A

s

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16
Q

What is the symbol used for energy?

A

e or W

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17
Q

What does the gradient of a displacement - time graph tell you?

A

The velocity

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18
Q

How can acceleration be found from a velocity - time graph?

A

The gradient

19
Q

Other than acceleration, what can a velocity time graph show you and how?

A

The displacemnent - the area underneath the graph

20
Q

Name the SUVAT equation that does NOT have s in it?

A

v = u + at

21
Q

How can s = ut + 1/2at^2 be derived?

A

Combining the equations:
v = u + at
s = 1/2 (v+u) t

s= 1/2(2ut + at^2)
s = ut + 1/2at^2

22
Q

How can v = u + at be derived?

A

A= (v-u) / t

Rearrange to find v

23
Q

Name the SUVAT equation that does NOT have v in it?

A

s = ut + 1/2at^2

24
Q

Name the SUVAT equation that does NOT have t in it?

A

v^2 = u^2 + 2as

25
Q

Name the SUVAT equation that does not have a in it?

A

s = 1/2(u + v)t

26
Q

What is needed for SUVAT equations to work?

A

A constant acceleration

27
Q

How many values of SUVAT are needed to find another?

A

3

28
Q

If an object is being thrown and has left the hand, which direction is the acceleration happening?

A

The reverse direction ( the ball is not going to speed up after it has left your hand)

29
Q

How must diagram be drawn when showing forces?

A

All the forces must be joined tip to tail

30
Q

What is a vector?

A

A quantity with magnitude AND direction

31
Q

What do we use to represent vectors?

A

Arrows. The direction is the direction and the length is the magnitude

32
Q

What must always be true about the reaction force?

A

It must be perpendicular to the surface it is acting on

33
Q

What must always be true about a frictional force?

A

It must be parallel to the surface it is acting on

34
Q

Why would two objects that have 0 vertical velocity fall at the same rate, even if the horizontal velocities were different?

A

Because the only force acting on both objects is the force due to gravity (ignoring air resistance)

35
Q

What is a moment?

A

A turning effect on an object around a pivot due to a force being applied

36
Q

How do you calculate moments?

A

Moment = force x perpendicular distance

37
Q

What two things MUST be true for an object to be in equilibrium?

A
  • The forces are balanced
  • The net moment is zero
38
Q

What is the centre of gravity?

A

The point at which all the weight of an object can be considered to act

39
Q

How can you represent forces that do not all act from the same point on an object?

A

Using a line

40
Q

What is a freebody diagram?

A

A diagram where an object is shown with all the forces acting on it, ignoring other objects around it

41
Q

What is Newton’s First Law?

A

An object will remain at rest or at constant velocity unless an unbalanced force acts on it

42
Q

What is newton’s Second Law?

A

If an unbalanced force acts on an object its velocity/momentum will change

43
Q

What equation goes with Newton’s Second Law?

A

(net) force = mass x acceleration

44
Q

What is Newton’s Third Law?

A

When a force acts between 2 objects, it will have equal magnitude on both objects but in opposite direction

Every action has an equal and opposite reaction

Physics Paper 1 (6 decks)

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