chapter 7 - laws of motion and momentum

Question 1

Newtons 1

Answer 1

an object will remain at rest/move with constant v unless acted on by a resultant force

Question 2

newtons 2

Answer 2

force is proportional to the rate of change of momentum of an object
F ∝ change in momentum/ time
F ∝ ma
F = ma (when we define the newton)

Question 3

newtons 3

Answer 3

when two objects imteract they exert and = and opposite forces on each other (3rd law pairs)

Question 4

conditions for newtons 3

Answer 4

• = in size
• opposite direction (along the same line)
• same type of force eg gravitational/ magnetic
• act on different bodies
• act for same amount of time