P8 - Forces In Balance

Question 1

Centre of mass

Answer 1

The point at which mass is thought to be concentrated

Question 2

Scalar quantities

Answer 2

Only have magnitude or size, no direction

E.g. distance, time, power, mass, energy, current, voltage, charge, frequency

Question 3

Vector quantities

Answer 3

Has magnitude and direction

E.g. force, acceleration, momentum, velocity

Question 4

Displacement

Answer 4

How far away you are from the original position

Question 5

Resultant force

Answer 5

The sum of all forces acting upon an object

Question 6

Equilibrium

Answer 6

When there is no resultant force, therefore forces are balanced

Question 7

Newtons 1st law

Answer 7

All objects with balanced forces acting on them will stay at rest or move in a constant motion

Question 8

Newtons 2nd law

Answer 8

Force = mass x acceleration

Question 9

Newtons 3rd law

Answer 9

Every action has an equal and opposite reaction

Question 10

Turning force / moment

Answer 10

Force x perpendicular distance

Question 11

Levers

Answer 11

They are force multipliers, they create moments

Question 12

Gears

Answer 12

Allow motion to be transferred from one point to another

They can also increase or decrease the turning force (moment)