CHAPTER 7

Question 1

NEWTONS FIRST LAW OF MOTION

Answer 1

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

Question 2

NEWTONS THIRD LAW OF MOTION

Answer 2

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

Question 3

CLOSED SYSTEM

Answer 3

an isolated system which has no interaction with its surroundings

Question 4

PRINCIPLE OF THE CONSERVATION OF MOMENTUM

Answer 4

total momentum of a system remains constant before and after a collision

Question 5

PERFECTLY ELASTIC

Answer 5

a collision where no kinetic energy is lost

Question 6

INELASTIC

Answer 6

a collision in which kinetic energy is lost

Question 7

NEWTONS SECOND LAW OF MOTION

Answer 7

the net (resultant) force acting on an object is directly proportional to the rate of change of its momentum

Question 8

FORCE- TIME GRAPH

Answer 8

a graph of net force against time, with the area under the graph equal to the impulse

Question 9

IMPULSE

Answer 9

the area under a force time graph- the product of force and the time for which the force acts