Further Kinematics 1 • Vector Motion • Mech2 Ex8A • 🎲

Edexcel Applied Year 2 - Mechanics

Thurs 5/3/20

[jiayanfan]

I feel like I'm watching youtube premium

[JohnSmith-qvcz]

@bicenmaths for the b part of the first question for you used the velocity but for the c part of the last question you used the displacement. Is there a way to know what to use to find the time in these cardinal directions questions.

[t.o]

Hi sir, im a bit confused on the questions that say things like “…the bearing on which it is travelling”, because although we use velocity in these examples, when i did the 2020 AS pure maths paper 1 (question 2), it had a question asking “…the bearing on which the boat is moving”, but you had to use the displacement? Thanks! :)

[Sarah-lkfe]

In the exam question (6) 23:25 why couldn't we use r=ro+vt to find the velocityn(u)

[samuelbrodie]

Can you mix and match vectors and scalars in suvat, or do vectors need to stay together and scalars need to stay together, i.e. could you use an acceleration of 2ms^-2 with an initial velocity of 2.4i - 0.6j or is that not allowed?
Thank you for all your comments!

[stdysteph]

why do you use the equation above (an expression for s in terms of t) to find the time at which the skater is north-east of O?

[SalmanKhan-einm]

How do I know when to use suvat with this or calculus

[wamiqmain]

is this in the syllabus of 2022 of mechanics?
i can only see it being included in pure mathematics 3
was this topic taken out of mechanics?

[dfszf]

how do u get the equation r = r0 + ut+ 1/2at^2 ?

[samuelbrodie]

For the last question part b, could you have also used the equation s= (u+v/2)t instead of s=ut+1/2at^2 to get s in terms of t?

[nonamekitty]

hi sir, i find it difficult to distinguish between r0 and r like when the exam question says A particle moves so that its position vector, in metres, relative to a fixed origin O at time t seconds is (2t − 3)i + (7 − 4t)j,

[aliabbas]

hi sir, can I use regular suvat without these specific vector formula. Ive been using it fine and all my answers are correct. Would I get the marks

[h.d]

hi sir, when it says that an object is moving in the direction of xi, yj does this only refer to the direction of the velocity. How does the acceleration/displacement vectors relate to this, or do they only when their is constant speed?

[BBK]

how do we assume that is the final velocity at 26:04, how do we know thats the end of the time period for suvat?

[Huaa]

27:10 why didn’t we find the magnitude since it doesn’t say we need it in vector form

[nevzys]

2:59 is this not just a vector equation of a line from cp1?

[MyMy]

you said 3i 7j is the origin but you're blue circle doesn't show that

[wel_r]

hi sir is there no vector version for the other suvat equation : s = 1/2(u+v)t

[malanhemal]

So when do you use r = r initial + vt - 0.5a t^2?