1: Motion - YK

Question 1

What is the equation for speed and average speed?

Answer 1

speed = distance / time (s=d/t)

average speed = total distance / total time

Question 2

What is the equation for acceleration?

Answer 2

acceleration = change in velocity / time (a=(v-u)/t)

Question 3

What does a flat line, straight line, and curved line mean on a distance-time graph?

Answer 3

Flat: object at rest
Straight: object moving at constant speed
Curved: object accelerating

Question 4

What does a flat line, straight line, and curved line mean on a velocity-time graph?

Answer 4

Flat: constant speed
Straight: constant acceleration (+ve or -ve)
Curved: object accelerating at different rates

Question 5

What is a scalar and vector?

Answer 5

A scalar is a quantity with size only (e.g. distance), a vector has direction and size (e.g. displacement).
Corresponding scalars and vectors are quantities with the same unit of measurement.

Question 6

What is the equation linking final velocity, initial velocity, acceleration and displacement?

Answer 6

v^2 = u^2 + 2ax (v-final velocity, u-initial velocity, a-acceleration, x-displacement)

Question 7

What is the equation linking final velocity, initial velocity, time and displacement?

Answer 7

x = 1/2(u+v)t (v-final velocity, u-initial velocity, t-time, x-displacement)