momentum

Question 1

what is Newtowns first law

Answer 1

object will remain. at state of rest or constant velocity unless acted upon by an external force

Question 2

newtons second law

Answer 2

the net force is proportional tot he rate of change of momentum and is in the same direction

Question 3

newtons second law equation

Answer 3

F= Δp/Δt = Δ(mv)/Δt = ma

Question 4

newtons third law

Answer 4

when two objects interact they exert equal and opposite forces on each other

Question 5

why are the weight and normal reaction force not a newtonian pair

Answer 5

they both act on the same body and they are forces of different nature

Question 6

what is impulse

Answer 6

the average net force acting acting on an object multiplied by the time it acts on it

Question 7

impulse equation

Answer 7

FΔt=Δp

Question 8

for a force time graph how can impulse be found

Answer 8

by finding the area under a graph

Question 9

what are the units of momentum

Answer 9

kgms⁻¹

Question 11

what does the principle of conservation of momentum say

Answer 11

the total momentum in a system remains unchanged unless there is a external force acting on it

Question 12

what is a perfectly elastic collision

Answer 12

kinetic energy is conserved momentum is also conserved

Question 13

what is perfectly inelastic collision

Answer 13

only momentum is conserved but but kinetic energy isnt conserved

Question 14

what usually happens to objects in a perfectly inelastic collision

Answer 14

objects stick together and move with a common velocity