4) Mechanics & Materials

Question 1

If force a vector or scalar

Answer 1

Vector

Question 2

How to resolve x (horizontal) component

Answer 2

F cos(theta)

Question 3

How to resolve y (vertical component)

Answer 3

F sin(theta)

Question 4

Unit for moments

Answer 4

Newton metres (Nm)

Question 5

What is a couple

Answer 5

A pair of equal and opposite coplanar forces, this means they lie in the same plane (coplanar), point in the opposite direction and have the same magnitude

Question 6

What does coplanar mean

Answer 6

Forces act in the same plane

Question 7

What is the resultant force of a couple

Answer 7

0

Question 8

Moment of a couple formula

Answer 8

Force x perpendicular distance between the lines of action of the forces

Question 9

Principle of moments

Answer 9

In order for an object to be in equilibrium, the sum of the clockwise moments must equal the sum of the anticlockwise moments

Question 10

What is the centre of mass

Answer 10

A single point where all of the mass APPEARS to be

Question 11

Velocity formula

Answer 11

Change in displacement / change in time

Question 12

What is instantaneous speed / velocity

Answer 12

The speed / velocity of an object at a given instant in time

Question 13

What is average speed / velocity

Answer 13

The total distance / displacement divided by the total time taken

Question 14

Acceleration formula

Answer 14

change in velocity / change in time

Question 15

What is acceleration

Answer 15

The rate and direction in which an object’s velocity changes

Question 16

What is velocity

Answer 16

The rate of change of displacement

Question 17

All suvat equations

Answer 17

v = u +at
s = ut + 0.5 a t^2
v^2 = u^2 + 2as
s = ((v+u) / 2) t
s = vt / 0.5 a t^2