P8 Forces In Balance

Question 1

What is a vector quantity

Answer 1

A vector quantity has magnitude (how big something is) and direction

Question 2

What is a scalar quantity

Answer 2

A scalar quantity only has a magnitude

Question 3

What is displacement

Answer 3

Distance from start to finish + direction

Question 4

What is a contact force

Answer 4

Force exerted between two objects when they are touching.

Question 5

What is a non contact force

Answer 5

a force which acts on an object without coming physically in contact with it.

Question 6

Examples of contact forces

Answer 6

Friction
Tension
Compression

Question 7

Examples of non-contact forces

Answer 7

Magnetic
Electro-static
Weight

Question 8

Examples of vector quantities

Answer 8

Displacement
Velocity
Weight

Question 9

Examples of scalar quantities

Answer 9

Speed
Mass
Energy

Question 10

Formula for weight

Answer 10

W=Mxg
Weight(N)=Mass(kg) x gravitational field

Question 11

What is the centre of mass

Answer 11

The point at which all the mass of an object seems to be concentrated

Question 12

What is the centre of mass equal to

Answer 12

Centre of gravity

Question 13

What is an object at rest in

Answer 13

Equilibrium

Question 14

What are the key conditions for an object to be in equilibrium

Answer 14

• The resultant force on the object is zero
• The forces acting on an object have no overall turning affect