Forgotten

Question 1

Centr of mass for triangle

Answer 1

Is 2/3rhe way from corner to midpoint

Always go for point we already know distance of

Question 2

How to do any moments q

Answer 2

Remember to write down normals

Resolve vertically first to remind yourself

Dind ewuations

Sub in the values for resolving vertically makes it easier

Cancel down

Question 3

How to justify maximum

Answer 3

Have to differntiate twice and sub in

Question 4

How to give direction for amble

Answer 4

Just say below horizontal / downward Vertical instead of negative !

Question 5

How to do sum to infinity questions and when?

Answer 5

If a ball bounced until velocity is 0

Then it means after infinity bounces the velocity is 0

So form an equation with the variables we know
Express each new one in terms of e

And sum tk infinity

And get answer
- but make sure your thing is consistent !

Question 6

Light String shave normal / friction (contact forced)?

Answer 6

No they don’t

Question 7

Whenever looking for inequalities, must staksig you two things

Answer 7

So check for x and y not just y, and then need the overloa

Question 8

Rememebr when tensions are their ti counter horizontal, what is the effect of decreasing angle

Answer 8

Decreasing angle means minimised the vertical force needed

Hence the tension decreases

Question 9

How to show in equilibrium using sliding snd toppling

Answer 9

Show it doesn’t slip

And doesn’t topple
BOTH NEEDED ( remember firces same, resuktsnt Moment same too)