P2 - important physics to know

Question 1

Newtons 1st law

Answer 1

An object will remain stationary or at constant velocity unless acted on by another force

Question 2

Newtons 2nd law

Answer 2

Force = Mass x Acceleration

Question 3

Newtons 3rd law

Answer 3

Every action has an equal and opposite reaction

Question 4

Law of conservations of momentum

Answer 4

In a collision when no other external forces act, momentum is conserved. Momentum before=Momentum after

Question 5

Elastic collision

Answer 5

total energy in kinetic energy stores of object colliding is the same before and after the collision

Question 6

Inelastic collision

Answer 6

some of energy in kinetic energy stores is transferred to other stores e.g heat or sound

Question 7

Hookes law

Answer 7

the extension of an elastic object is directly proportional to the force applied, up to the limit of proportionality

Question 8

Scalar quantity

Answer 8

Magnitude only - e.g speed, distance, mass

Question 9

Vector quantity

Answer 9

any quantity that has magnitude and direction - e.g velocity, displacement, acceleration