P5 - Momentum

Question 1

What do all objects have?

Answer 1

Momentum

Question 2

What is momentum?

Answer 2

How much power an object has.

(The greater the mass of an object,or the greater its velocity,the more momentum the object has

Question 3

What type of quanitity is momentum?

Answer 3

A vector quanity - it has size and direction

Question 4

What is the equation for momentum?

Answer 4

Momentum (kg m/s) = mass (kg) x velocity (m/s)

(In abbreviated terms p = mv)

Question 5

A 50kg cheetah is running at 60m/s.Calculate its momentum

Answer 5

P = mv = 50 x 60

= 3000 kg m/s

Question 6

A boy has a mass of 30kg and a momentum of 75 kg m/s.Calculate his velocity

Answer 6

v = p / m = 75 / 30 = 2.5 m/s

Question 7

What is the conversion of momentum?

Answer 7

In a closed system,the total momentum before an event will be the same as after the event

Question 8

In snooker how is momentum used in it?

Answer 8

Lets take 2 balls as an example.A white ball and a red ball.The red ball is stationary so it has zero momentum.But we hit the white ball so it is moving with a velocity v,so it has a momentum of p = mv.Now the white ball hits the red ball,causing it to move.The red ball has momentum,the white ball continues movies but at a much small velocity (and so at a much smaller momentum.The combined momentum of the red and white ball is equal to the original momentum of the white ball,mv

Question 9

If the momentum before an event is zero,what will it be after the event?

Answer 9

Zero

(For example in an explosion,the momentum before is zero.After the explosion,the pieces fly off in different direction,so that the total momentum cancels out to zero)