07 - Laws of Motion and Momentum

Question 1

Newton’s first law of motion

Answer 1

a body will remain at rest or continue to move with constant velocity unless acted upon by a resultant force

Question 2

Newton’s second law of motion

Answer 2

rate of change of momentum of an object is directly proportional to the resultant force and takes place in the direction of the force

Question 3

Newton’s third law of motion

Answer 3

when two objects interact, each exerts an equal but opposite force on the other during the interaction

Question 4

linear momentum

Answer 4

product of mass and velocity of a particle, measured in kgms^-1 or Ns

Question 5

closed system

Answer 5

an isolated system that has no interaction with its surroundings

Question 6

principle of conservation of momentum

Answer 6

total momentum of a system remains the same before and after a collision

Question 7

perfectly elastic collision

Answer 7

collision in which kinetic energy is conserved

Question 8

inelastic collision

Answer 8

collision in which kinetic energy is transferred to other forms

Question 9

impulse

Answer 9

the product of force and the time for which the force acts