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Physics A level > Mechanics > Flashcards

Mechanics Flashcards

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1
Q

State the suvat equations

A
  • s = (u + v)t / 2
  • a = v - u / t
  • s = ut + 1/2at2
  • v2 = u2 + 2as
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2
Q

What is the difference between distance and displacement?

A
  • Displacement is a vector
  • Distance is scalar
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3
Q

What does a horizontal line represent on a displacement time graph?

A
  • Stationary
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4
Q

What does a straight line where gradient is not zero mean on a displacement time graph?

A
  • Constant speed
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5
Q

How is constant velocity forwards and backwards represented on displacement time graph?

A
  • Constant velocity forwards is a straight line angled up
  • Constant velocity backwards is a straight line angled down
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6
Q

How do you represent a stationary object on a velocity time graph?

A
  • Horizontal line at zero
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7
Q

How do you represent a constant speed on a velocity time graph?

A
  • Horizontal line
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8
Q

How do you represent a constant accleration on a velocity time graph?

A
  • Straight line angled up
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9
Q

How do you represent a constant decelleration on a velocity time graph?

A
  • Straight line angled down
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10
Q

What does gradient represent on a velocity time graph?

A
  • Acceleration
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11
Q

How do you represent a stationary object on an acceleration time graph?

A
  • Can’t be shown
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12
Q

How do you represent constant speed on an acceleration time graph?

A
  • Horizontal line at zero
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13
Q

What represents a changing acceleration on an acceleration time graph?

A
  • A straight line angled up or down
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14
Q

What does the gradient represent on an acceleration time graph?

A
  • Jerk
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15
Q

Describe what a displacment, velocity and acceleration time graph would look like if a ball was thrown straight up into the air and then fell back down.

A
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16
Q

How do you find percentage error of multiple readings?

A
  1. Find range
  2. Range / 2 = Uncertainty
  3. %d = Uncertainty / Average value
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17
Q

How do you find percentage error of a single reading?

A
  1. Uncertainty = Resolution of instrument / Reading
  2. Then divide by 2
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18
Q

What is a vector quantity?

A
  • Vector quantities have magnitude and direction
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19
Q

What is a scalar quantity?

A
  • Has magnitude only
20
Q

What is Newtons 1st law?

A
  • States that a body will remain at rest or move with uniform velocity unless acted upon by a resultant external force
21
Q

What Newtons 2nd law?

A
  • States for a body of fixed mass, acceleration is directly proportional to the resultant force applied to the body
  • F = ma
  • Δp / t = F
22
Q

What is Newtons 3rd law?

A
  • States if object A exerts a force on object B then object B exerts an equal and opposite force on object A
23
Q

What is the equation for gravitational field strength?

A
  • g = F / m
24
Q

What is the equation for weight?

A
  • W = mg
25
Q

What is the equation for momentum?

A
  • p = mv
26
Q

What is the conservation of momentum?

A
  • Total momentum before = Total momentum after if no resultant external force acts
27
Q

What is the moments equation?

A
  • Moment = Fd
  • Moment = Force * Perpendicular distance from pivot
28
Q

What is the principle of moments?

A
  • In equilibrium, total moments clockwise = total moments anticlockwise
29
Q

What is the centre of gravity?

A
  • The point at which all weight acts
30
Q

What is the equation for impulse?

A
  • Δp = Ft
31
Q

What is the equation for kinetic energy?

A
  • KE = 1/2mv2
32
Q

What is the equation for GPE?

A
  • GPE = mgh
33
Q

What is the principle of concervation of energy?

A
  • Energy cannot be created or destroyed only transfered from one form to another
34
Q

What is the equation combining GPE and KE?

A
  • 1/2mv2 = mgh
35
Q

What are the equations for power?

A
  • P = E/t
  • P = W/t
  • Energy transfered = Work done
  • P = I2R
  • P = V2/R
36
Q

What are the equations for effeciency?

A
  • Efficiency = Useful energy output / Total energy input
  • Efficiency = Useful power output / Total power input
37
Q

What should you do when dealing with projectiles?

A
  • Treat horizontal and vertical motion separatly using suvat
38
Q

What is the equation for work?

A

Work done = Force in direction of travel × Distance

39
Q

What is a Newtons Third law pair of forces?

A
  • Same type of force
  • Same size
  • Opposite direction
  • Act of different bodies
  • Same line of action
  • Act for same time
40
Q

Equation for velocity

A
  • Velocity = displacement / time
41
Q

If you get stuck think…

A

ENERGY, UNITS, RESULTANT FORCES, ACCELERATION

42
Q

Core practical 1: acceleration of free falling object

  • Independant variable
  • Dependant
  • Equation
  • y=mx + c
  • Graph to plot
  • Equipment = Light gate and data logger
A
  • Height dropped
  • Final Velocity
  • v2 = u2 + 2as
  • y=mx + c
  • y axis plot v2
  • x axis plot s
43
Q

What is the power equation that includes force?

A
  • P=fv
44
Q

What is change in momentum for one object?

A
  • Change in momentum = final momentum - initial momentum
45
Q

What must you remember whilst drawing a force free body diagram?

A
  • CUT IT OUT OF THE PICTURE
  • Only forces acting on the body
46
Q

How do you calculate displacment for object traveling in curve or circle?

A
  • Draw a straight line from start to finish and use pythag

Physics A level (11 decks)

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