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AS levels Resurrection > P 1. Basic Physics > Flashcards

P 1. Basic Physics Flashcards

1
Q

The beginning of a re-run

A

Hm

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2
Q

If the dimension is length, what is its unit?
(SI)

A

metre
(m)

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3
Q

If the dimension is mass, what is its unit?
(SI)

A

kilogram
(kg)

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4
Q

If the dimension is time, what is its unit?
(SI)

A

second
(s)

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5
Q

If the dimension is electric current, what is its unit?
(SI)

A

ampere
(A)

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6
Q

If the dimension is thermodynamic temperature, what is its unit?
(SI)

A

kelvin
(K)
Although, they still be using °C

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7
Q

If the dimension is the “amount of substance”, what is its unit?
(SI)

A

mole
(mol)

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8
Q

Do u know how to check equations?
P = ρgh
(refer to SI)

A

This is my run through:
e.g. P = ρgh
1. Find the original symbols stated in these symbols
2. And then see if they equal each other
3. This is definitely hard and unfortunately, decent marks for these man D:

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9
Q

Checking equations’ questions past papers are op

A

Okay

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10
Q

Describe scalar quantity?

A

Only magnitude e.g. temperature = 20°c

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11
Q

Describe vector quantity?

A

Magnitude and direction e.g. velocity = 50 m/s East

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12
Q

How to combine vectors of parallel and anti-parallel vectors?
(3 steps)

A
  • A & B moving towards same direction
  • A has bigger force than B
  • Together combined = resultant vector (A+B)
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13
Q

Another “rendition” of combining vectors of parallel and anti-parallel vectors?
(2 steps)

A
  • C going forward, D going backwards towards C
  • Resultant vector = C - D
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14
Q

How to combine non-parallel vectors of a parallelogram of vectors?
“head-to-tail method”
(3 steps)
right angle graph type shi

A
  • If A & B form 2 sides of a completed parallelogram
  • C (between A & B) = resultant vector
  • Between the opposite corners
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15
Q

How to combine non-parallel vectors of a polygon of vectors?
“head-to-tail method”
(4 steps)

A
  • “5 sided shape” in terms of vectors
  • Last side no vector (anti-clockwise)
  • Remaining vectors added = resultant vector
  • A+B+C+D = E
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16
Q

How to resolve vectors of “combining perpendicular vectors”?
(3 steps)

A
  • SoH CaH ToA & a2 + b2 = c2
  • Resultant force gained
  • Always get the angle
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17
Q

How does horizontal & vertical components during the resolving of vectors into components work?
(2-step instruction)

A
  • xy graph
  • The opposite of combining perpendicular vectors
  • Using the force (N) from hypotenuse
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18
Q

What’s the equation for horizontal component?

A

x = Z cos θ

Z = the resultant vector
remember it’s horizontal so ofc it’s the angle that’s…. horizontal
or maybe that’s the only angle lol

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19
Q

What’s the equation for vertical component?

A

y = Z sin θ

Z = the resultant vector
remember it’s vertical so ofc it’s the angle that’s… vertical
or maybe that’s the only angle lol

20
Q

The 4 steps to resolving several coplanar vectors?
(The true applied)

A
  1. Resolve horizontal & vertical components for each force
  2. Add up horizontal and vertical components separately
  3. Calculate the resultant force using a2 + b2 = c2
  4. Find angle using SoH CaH ToA
    ^ Importance right there
21
Q

Explain step 1 of resolving several coplanar vectors?

A

The use of horizontal & vertical component equations

22
Q

Explain step 2 of resolving several coplanar vectors?
(2 steps)

A
  • Take into consideration that parallel & anti-parallel vectors take place
  • Addition and subtraction
23
Q

Explain step 3 of resolving several coplanar vectors?
(3? steps)

A
  • After gaining horizontal & vertical components
  • U do Pythagoras theorem
  • Triangle = optional
24
Q

Explain step 4 of resolving several coplanar vectors?
(2? steps)

A
  • Just do trigonometry…
  • Triangle = optional
25
Q

Tell me about objects on a banked slope
(MAJOR check up)

A
  1. U r usually given like the “main triangle” that the person is sliding down on
  2. But then, u have to kind of create “another triangle” for the person sliding:
    - The contact force being perpendicular to the right angle (vertically up, the arrow is up)
    - The hypotenuse on the “other triangle” is w=mg
    - From the main triangle, that’s the component of weight down the slope
    - U can gain the angle above the right angle from the “main triangle” (if u know u know)
  3. Then u can just use trigonometry like normal to find the unknown forces (at first, i thought it was some opposite of horizontal/vertical components. Oh boy was I wrong….):
    - Contact force in this case would be = Cah
    - Component of weight down the slope = Soh
  4. Wow that’s pretty simple! But be aware of finding frictional force (constant speed = same force of component of weight down the slope)

Honestly, it’s better if u do a bunch of questions (btw i don’t even do a bunch of question ¬.¬)

26
Q

Equation for density? (ρ)

A

ρ = m/v

27
Q

Word form of density equation?

A

Density = mass/volume

28
Q

Define ρ
(Density equation)

A

Density
(kg/?-3)

29
Q

Define m
(Density equation)

A

Mass
(kg)

30
Q

Define v
(Density equation)

A

Volume
(?3)

31
Q

What’s the jig with volume in density equation?

A

Can be any volume
e.g. sphere, cuboid, cylinder, etc.

32
Q

Define the centre of mass

A

The point where total mass of an object can be treated as a single point

33
Q

Define the centre of gravity

A

Single point within a body at which the entire weight of body may be considered to act

34
Q

Condition for CoM & CoG to coincide

A

When there is a uniform gravity present in the region

35
Q

How to find centre of gravity of an object?
(5 steps)

A

Can’t say steps, not enough time

  • Plumbline, hang, draw line, lines meet, WOW
  1. Hang object freely from 1 corner
  2. Draw line from suspended plumb line you’ve hung
  3. Hang object freely from another corner
  4. Repeat step 2
  5. Where line meets = CoG
36
Q

What causes a vehicle to tip over?
(2 steps)

A
  • When it’s centre of gravity passes the point of pivot
  • However sometimes it will topple faster based on CoM
37
Q

How do you increase size of moment?
(2 ways)

A
  • Increase force
  • Increase perpendicular distance between force and pivot
38
Q

Unit of moment?

A

Newton-metre
(Nm)

39
Q

Equation to gain moment?

A

Nm = N x m

40
Q

Word form of moment equation?

A

Moment = Force x perpendicular distance from pivot

41
Q

State the principle of moments

A

In a rotational equilibrium, ∑ clockwise moments = ∑ anti-clockwise moments about the same point

obviously say all in words tho.

42
Q

2 conditions for a system to be in equilibrium?

A
  • No net force
  • No net moment
43
Q

Define moment of a force?

A

The turning effect of a force applied to a rotational system at a distance from the axis of rotation

44
Q

Past paper questions, let’s go

A

O

45
Q

I sold cuz I gambled hard, I want an immediate revamp

A

Aye aye sir

AS levels Resurrection (22 decks)

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