Physics U3 Ch 1-4

Question 1

Whats a vector

Answer 1

quantity that has both magnitude and direction (also considering horizontal and vertical)

Question 2

how do you mind magnitude and direction?

Answer 2

magnitude - pythag
direction - trig (SOHCAHTOA)

Question 3

Are horizontal and vertical components of velocity dependent or independent?

Answer 3

independent

Question 4

A ball is thrown horizontally off a cliff at 20m/s and takes 3 secs to reach the ground.
a) calc how far out from the base of the cliff the ball will land?
b)impact velocity in the vertical direction?
c) height of the cliff?

Answer 4

a) Sx=Ux x t
Sx= 20 x 4 = 80m
b) Vy=Uy + gt
= 0 + -9.8x4
= -39.2 m/s
c) Sy = Uy x t + 0.5gt^2
= 0+ -9.8x4^2
= -78.4m