Mechanics 1

Question 1

What is kinematics?

Answer 1

A way to describe and understand motion using distance, speed, displacement, velocity, time and acceleration

Question 2

What is acceleration?

Answer 2

Change in meter/s (v) every second

Question 3

Deceleration

Answer 3

If acc is acting in opp direction of velocity vector, it slows down the velocity vector by that meter/s every second

Question 4

What happens to v when a is perpendicular to v?

Answer 4

Velocity will change

Question 5

Can you have acc without v changing?

Answer 5

Yes butt how?

Question 6

Formula for velocity in general

Answer 6

v = ∆displacement/∆time

Question 7

What is instantaneous velocity?

Answer 7

Velocity of an object at a particular time when the velocity is not constant but acc is?

v(f) = v(i) + at

Question 8

What is the avg v?

Answer 8

It is the gradient of a position-time graph

Question 9

Equation without need for acc at that time/ magnitude/ direction?

Answer 9

v(avg) = 1/2 (v(i) + v(f))

Question 10

Equation for d when motion has a constant uniform acc?

Answer 10

d = v(i) + a(t)ˆ2

Question 11

Equation that doesn’t include time

Answer 11

v(f)ˆ2 = v(i)ˆ2 + 2ad

Question 12

What is the acc for all objects when they fall?

Answer 12

9.81 or use preferably 10ms-2

Question 13

If ball is thrown upwards, whats the situation?

Answer 13

Its going against gravity and as acc is downwards, the gravity slows down the upwards velocity by 10ms-1 every second

Question 14

When throwing a ball at an angle…

Answer 14

USE THE DAM VECTOR COMPONENTS

Question 15

Formula for v

Answer 15

v = dis(f) - dis(i)/ time(f) - time (i)

Question 16

On a velocity-time graph

Answer 16

If acc is constant, the velocity is a straight line. A straight horizontal line means that velocity if constant.