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Physics > S5 - Physics Unit 1 > Flashcards

S5 - Physics Unit 1 Flashcards

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1
Q

How do you find the vertical component when resolving vectors?

A

v x sinθ

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2
Q

How do you find the horizontal component when resolving vectors?

A

v x cosθ

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3
Q

What are the SUVAT equations?

A

s = ut + ½at²
v² = u² + 2as

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4
Q

What does the direction of motion graph look like?

A
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5
Q

What does a velocity time graph look like when an object is moving at a constant velocity?

A
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6
Q

What does a velocity time graph look like when an object is constantly accelerating?

A
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7
Q

What does a velocity time graph look like when an object is constantly decelerating?

A
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8
Q

Describe what is happening in the graph:

A

An object is decelerating , reaching a stop, and then accelerating

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9
Q

What does an acceleration-time graph with an object at a constant velocity look like?

A
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10
Q

What does an acceleration-time graph with an object constantly accelerating up / decelerating down look like?

A
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11
Q

What does an acceleration-time graph with an object constantly accelerating down / decelerating up look like?

A
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12
Q

What does a displacement-time graph with a constant acceleration look like?

A
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13
Q

What does a displacement-time graph with a constant deceleration look like?

A
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14
Q

Describe what is happening in the graph:

A

An object moving up reaching its maximum displacement, then moving back down to where it started

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15
Q

What does the area under a v-t graph equate to?

A

Displacement/distance

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16
Q

What does the area under a s-t graph equate to?

A

Nothing

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17
Q

What does the area under an a-t graph equate to?

A

Velocity

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18
Q

What is Newton’s first law?

A

An object will remain at rest or move in a straight line with a constant velocity unless it is acted on by an unbalanced force

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19
Q

What is Newton’s second law?

A

When an unbalanced force is acting on an object it will accelerate/decelerate

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20
Q

What is Newton’s third law?

A

Every action has an opposite but equal reaction

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21
Q

What is the equation for when a lift is:
- accelerating up
- decelerating down
- accelerating down
- decelerating up
- at a constant speed

A

S = W + ma
S = W + ma
S = W - ma
S = W - ma
S = W

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22
Q

What is the symbol for “parallel”?

A

∥ (two lines)

23
Q

What is the symbol for “perpendicular”?

A

⊥ (an upside down T)

24
Q

What equation do you use in a question when the forces are parallel to the object on a slope?

A

F∥ = mg x sinθ

25
Q

What equation do you use in a question when the forces are perpendicular to the object on a slope?

A

F⊥ = mg x cosθ

26
Q

Label the diagram:

A
27
Q

What is momentum - a vector or scalar?

A

A vector

28
Q

What is the symbol for momentum and what equation can you use to find it?

A

p

p=mv

29
Q

What does the law of conservation state?

A

When two objets collide, the total momentum before and after the collision are equal

30
Q

What equation can be used to find the mass or velocity of either of the objects before or after a collision?

A

m₁v₁ + m₂v₂= m₃v₃+ m₄v₄

31
Q

What does it mean if a collision is elastic?

A

The Ek before the collision is = to the Ek after the collision

32
Q

What does it mean if a collision inelastic?

A

The Ek before the collision is ≠ to the Ek after the collision

33
Q

What is the symbol for impulse?

A

Ft

34
Q

What is the definition for impulse?

A

The force applied to an object over a time

35
Q

What is the equation to find impulse?

A

Ft = mv - mu

36
Q

What is the equation relating to Newton’s law of gravitation?

A

F = G m₁m₂ / r²

37
Q

What is G?

A

Gravitational constant

38
Q

What is the equation for time dilation?

A

t’ = t /√1 - (v/c)²

39
Q

What is the symbol ‘c’?

A

Speed of light

40
Q

What is the length contraction equation?

A

l’ = l /√ 1 - (v / c)²

41
Q

What is the symbol ‘ t’ ‘?

A

Observers time

42
Q

What is the symbol ‘ l’ ‘?

A

Observed length

43
Q

What is the the symbol ‘t’?

A

“True” time

44
Q

What is the symbol ‘l’?

A

“True” length

45
Q

What is the equation for the doppler effect?

A

fo = fs (v / v ± vs)

46
Q

When is the + and - used in the doppler effect equation?

A

Towards (bad) = -
Away (good) = +

47
Q

What does red shift prove?

A

That the universe is constantly expanding and accelerating away from a single point

48
Q

What is the symbol for red shift?

A

z

49
Q

What is the equation for redshift?

A

z = λ(observed) - λ(rest) / λ(rest)

50
Q

What are other pieces of evidence that support the Big Bang Theory?

A
  • CMB radiation
  • Olbers paradox
  • Abundance of H and He
51
Q

What is the symbols for Hubble’s constant?

A

Ho

52
Q

What is the formula including Hubble’s constant?

A

v = Ho x d

53
Q

What is redshift?

A

The wavelength of light emitted by galaxies increasing into the red section of the visible spectrum as they accelerate away from earth

Physics (9 decks)

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