Physics - Linear Momentum - A levels

Linear Momentum

the momentum of an object moving in only one dimension

Linear momentum of an object remains constant unless the system is acted upon by an external resultant force

True, it remains constant unless acted by a resultant force

State the formula of linear momentum

p = mv

Linear momentum is a vector quantity

Yes, it has both direction and magnitude

State the principle of linear momentum

The momentum before and after the collision is the same

What is impulse

It is an external force that acts on an object for a very short time and changes the object’s motion

equation of impulse

j = force x change in time

Impulse is the change of

Momentum

the equation f = change in p / change in time can only be used when the mass of object is constant

false, it can be used even when the mass is not constant

The equation f=ma can only be used when mass is constant

True, it can only be used when mass is constant

Define the term collision

it is when two or more moving objects come together and exert a force on each other

Define explosion

it is when an object at rest, are propelled apart from one another.

Momentum is always conserved in collisions and explosions

True , it is always conserved before and after the collision

Kinetic energy is always conserved in explosions and collisions

False, it might not be conserved in inelastic collisions

Define elastic collision

When two objects collide and kinetic energy and momentum after and before the collision is conserved

Define inelastic collision

It is when two objects collide and kinetic energy is not conserved after the collision, but momentum is always conserved.