Momentum

Question 1

What is the equation for working out momentum ?

Answer 1

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

P = mv

Question 2

What property do all moving objects have ?

Answer 2

Momentum

Question 3

True or false : The smaller the mass of an object or the smaller its velocity, the more momentum the object has

Answer 3

False: the greater the mass of an object or the greater its velocity, the more momentum the object has.

Question 4

True or false: momentum is a vector quantity ?

Answer 4

True : it has size and direction.

Question 5

What is conservation of momentum ?

Answer 5

In a closed system ( no external forces act) the total momentum before an event is the same as after the event.

Question 6

For example a moving car hits into the back of a parked car.
The crash causes the two cars to lock together, they continue moving in the direction that the original moving car was travelling, but at a lower velocity. What happened before momentum and what happened after momentum?

Answer 6

Before: the momentum was equal to mass of moving car x its velocity.

After: The mass of the moving object has increased, but its momentum is equal to the momentum before the collision. So an increase in mass caused a decrease in velocity.