P10.4 Momentum

Question 1

Why does a bike break faster than a truck

Answer 1

The truck because it has the greatest mass. Therefore it has the greatest momentum. It requires a larger amount of energy to dissipate in order to bring it to a stop

Question 2

What is momentum

Answer 2

How much motion an object has - depending on the mass and velocity

Question 3

How to work out momentum?

Answer 3

p = mv

(Momentum = mass x velocity)

Question 4

What is a closed system

Answer 4

A physical system that does not exchange matter or energy with its surroundings

Question 5

Why would a ball swinging without any oxygen or air resistance around it swing forever

Answer 5

Because energy cannot be created or destroyed

Question 6

Why would a gun recoil,when it fires a bullet using knowledge of momentum

Answer 6

A gun recoils when it fires a bullet because, according to the law of conservation of momentum, the momentum of the bullet moving forward is balanced by an equal and opposite momentum that pushes the gun backwards