P 1. Basic Physics

Question 1

The beginning of a re-run

Answer 1

Hm

Question 2

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

Answer 2

metre
(m)

Question 3

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

Answer 3

kilogram
(kg)

Question 4

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

Answer 4

second
(s)

Question 5

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

Answer 5

ampere
(A)

Question 6

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

Answer 6

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

Question 7

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

Answer 7

mole
(mol)

Question 8

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

Answer 8

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:

Question 9

Checking equations’ questions past papers are op

Answer 9

Okay

Question 10

Describe scalar quantity?

Answer 10

Only magnitude e.g. temperature = 20°c

Question 11

Describe vector quantity?

Answer 11

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

Question 12

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

Answer 12

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

Question 13

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

Answer 13

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

Question 14

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

Answer 14

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

Question 15

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

Answer 15

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

Question 16

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

Answer 16

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

Question 17

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

Answer 17

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

Question 18

What’s the equation for horizontal component?

Answer 18

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

Question 19

What’s the equation for vertical component?

Answer 19

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

Question 20

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

Answer 20

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

Question 21

Explain step 1 of resolving several coplanar vectors?

Answer 21

The use of horizontal & vertical component equations

Question 22

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

Answer 22

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

Question 23

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

Answer 23

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

Question 24

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

Answer 24

• Just do trigonometry…
• Triangle = optional

Question 25

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

Answer 25

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 ¬.¬)

Question 26

Equation for density? (ρ)

Answer 26

ρ = m/v

Question 27

Word form of density equation?

Answer 27

Density = mass/volume

Question 28

Define ρ (Density equation)

Answer 28

Density (kg/?^-3)

Question 29

Define m (Density equation)

Answer 29

Mass (kg)

Question 30

Define v (Density equation)

Answer 30

Volume (?³)

Question 31

What's the jig with volume in density equation?

Answer 31

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

Question 32

Define the centre of mass

Answer 32

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

Question 33

Define the centre of gravity

Answer 33

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

Question 34

Condition for CoM & CoG to coincide

Answer 34

When there is a uniform gravity present in the region

Question 35

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

Answer 35

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

Question 36

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

Answer 36

- When it's centre of gravity passes the point of pivot - However sometimes it will topple faster based on CoM

Question 37

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

Answer 37

- Increase force - Increase perpendicular distance between force and pivot

Question 38

Unit of moment?

Answer 38

Newton-metre (Nm)

Question 39

Equation to gain moment?

Answer 39

Nm = N x m

Question 40

Word form of moment equation?

Answer 40

Moment = Force x **perpendicular** distance from pivot

Question 41

State the principle of moments

Answer 41

In a rotational equilibrium, ∑ clockwise moments = ∑ anti-clockwise moments **about the same point** obviously say all in words tho.

Question 42

2 conditions for a system to be in equilibrium?

Answer 42

- No net force - No net moment

Question 43

Define moment of a force?

Answer 43

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

Question 44

Past paper questions, let's go

Answer 44

O

Question 45

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

Answer 45

Aye aye sir