Objects Affecting Each Other

Question 1

What is a contact force?

Answer 1

Forces which only act when objects are in contact/touching each other

Question 2

Example of contact forces

Answer 2

Push
Pull
Upthrust
Water/air resistance 
Friction
Reaction force - normal contact force

Question 3

What is a non-contact force?

Answer 3

Forces that can act when objects are touching or when they aren’t touching.

Question 4

Examples of non-contact forces

Answer 4

Gravity
Magnetism
Electrostatic

Question 5

What is happens to a non-contact force as the distance increase?

Answer 5

It deceases as objects get further apart.

Question 6

What is a force field?

Answer 6

Space around a object where it can affect other objects

Non-contact forces work by creating a force field.

Question 7

Gravitational field:

• which ways do the arrows go
• what objects does it affect

Answer 7

• arrows towards central object (eg: Earth) pulling the other object down
• affects any object with mass

Question 8

Magnetic field:

• what shape do the arrows form
• what objects does it affect

Answer 8

• form horseshoe shapes around objects with magnetic fields
• flow from N—>S
• affects magnetic objects

Question 9

Electric field (electrostatic field):

• what shape or direction are the arrows in
• what objects does it affect

Answer 9

• forms around charged objects
• charges flow +ve—> -ve
• affects other charged and non-charged objects