forces

Question 1

what is friction?

Answer 1

the force which opposes the motion of an object

Question 2

what direction does friction act in?

Answer 2

the opposite direction to the objects motion

Question 3

what is contact force?

Answer 3

force that acts between objects that are physically touching

Question 4

what is an example of air resistance?

Answer 4

the air particles are physically touching the parachute

Question 5

are tension and reaction force non- contact forces or contact forces?

Answer 5

contact forces

Question 6

what is a non contact force?

Answer 6

force that acts at a distance without any contact between bodies due to the action of a field

Question 7

what are some examples of non- contact force?

Answer 7

gravitational force, electrostatic force and magnetic force

Question 8

what is the definition of gravitational field strength?

Answer 8

the force a gravitational field exerts per kg of mass

Question 9

does mass or weight ever change?

Answer 9

mass never changes but weight can change