chapter 7 A level

Question 1

what must you remember when dealing with a question that has V suvat and H suvat

Answer 1

.that gravity is only on the vertical

Question 2

what do the symbols of the formula OPsin(θ) = v/h/OPcos(θ) = v/h, mean

Answer 2

OP - the resultant F
θ - the angle
v- the vertical unit
h - the horizontal unit

Question 3

do a)

Answer 3

.OPsin(θ) = v
50sin(50) = 38.3ms^-1

.v/g = t
38.3/9.81 = 3.9s

s = ut + 1/2at^2
74.8 = 38.33.9+0.5-9.81*3.9^2
74.8 + 200 = 274.8m
274.8m = ans

Question 4

when you have vertical v and horizontal v how do you work out the total v

Answer 4

Total v = sqr (Vx^2 + Vy^2)

Question 5

when dealing with vertical and horizontal what should you remember for t

Answer 5

it’s the same on both sides

Question 6

when working out the horizontal distance of an object thrown what should you work out

Answer 6

the t reached before maximum height the t down and the Hv

Question 7

work out h (total time of flight = 6 seconds)

Answer 7

do OPsin(θ) = Vv
40sin(30) = 20ms^-1

xT = Uv / g
2.04 = 20 / 9.81

total t till Y = 2.04 * 2
4.08s

6 - 4.08 = 1.92s from y to floor
2.04 * 9.81 = 20ms^-1
a = g

s = ut + 1/2at^2
s = 201.96 + 1/29.81*1.96^2
s = 60ms^-1