Momentum And Impulse

Question 1

Momentum

Answer 1

The product of an objects mass and velocity

Question 2

Impulse

Answer 2

The product of the resultant force acting on an object and the time taken for the force to act it

Question 3

Newton’s second law in terms of momentum

Answer 3

The resultant force acting on object is equal to the rate of change of momentum and the change is in the direction of the resultant force

Question 4

Principle of conservation of momentum

Answer 4

The total linear momentum in an isolated system remains constant/is conserved

Question 5

An isolated system

Answer 5

A physical configuration of particles and objects that we study that does not allow the exchange of mass or energy to and from its surroundings

Question 6

Impulse and motor vehicle safety

Answer 6

The safety feature decreases the rate of change of momentum by increasing the contact time of the collision which decreases the force of the collision on the occupants, thus minimising injury.

Question 7

Safety features in a car

Answer 7

Seatbelts, Airbags, Arrestor beds, Crumple zones

Question 8

Elastic collision

Answer 8

The total kinetic energy of the collision is conserved/ remains constant

Question 9

Inelastic collisions

Answer 9

The total kinetic energy of the collision is not conserved/ constant