Kinematics

Question 1

What are standard assumptions for objects moving under gravity?
What is the acc. For an object moving freely under gravity?

Answer 1

Object is modelled as a particle and air resistance ignored.

9.8 ms^-1 on earth (give answers to 2 or 2 sig fig)

Question 2

When are SUVAT equations used?

Answer 2

In cases of constant acceleration

Question 3

What is the condition for maximum height (value of vertical v comp.)?

Answer 3

Vertical velocity = 0. Object stops going up and starts coming down.

Question 4

what is a particle?

Answer 4

object modelled as having 0 size, shape and dimensions ignored

Question 5

difference between distance and displacement?

Answer 5

distance is how far particle travells along its own path, displacement is how far particle has travelled in proximity to an origin or initial position

Question 6

what is the gradient of a displacement time graph?

Answer 6

velocity

Question 7

what is the area under a velocity time graph?

Answer 7

displacement

Question 8

what is the gradient of the velocity time graph?

Answer 8

acceleration

Question 9

what is the area under an acceleration time graph

Answer 9

change in velocity

Question 10

what are the 4 suvat equations?

Answer 10

v = u +at
s = 1/2 (u+v)t
s = ut + 1/2 at^2 or s = vt - 1/2 at
v^2 = u^2 + 2as

Question 11

how do you solve constant acceleration problems?

Answer 11

write out suvat, identify the given variables and fit into the best suited equation