5.2 Representations of Changes in Momentum

Front

What is momentum?

Back

Momentum is the product of an object's mass and its velocity, represented by the formula p = mv, where p is momentum, m is mass, and v is velocity.

Front

How is the change in momentum calculated?

Back

The change in momentum (Δp) is calculated as the final momentum (pf) minus the initial momentum (pi), or Δp = pf - pi.

Front

What is the principle of conservation of momentum?

Back

The principle of conservation of momentum states that in a closed system, the total momentum before an event is equal to the total momentum after the event, provided no external forces act on it.

Front

What is impulse?

Back

Impulse is the change in momentum of an object when a force is applied over a period of time, calculated as Impulse = Force × Time (J = FΔt).

Front

How does a net force affect momentum?

Back

A net force applied to an object results in a change in its momentum, with the change being proportional to the magnitude of the net force and the duration of time the force is applied.

Front

What is the relationship between force and momentum?

Back

The relationship is described by Newton's second law, which states that the net force acting on an object is equal to the rate of change of its momentum (F = Δp/Δt).

Front

What happens to momentum when two objects collide?

Back

In a collision, the total momentum of the two objects before the collision is equal to the total momentum after the collision, assuming no external forces act on them.

Front

What is a variable net force?

Back

A variable net force is a force that changes in magnitude and/or direction over time, affecting the acceleration and momentum of an object.

Front

How does friction affect momentum?

Back

Friction opposes the motion of an object, resulting in a decrease in momentum over time as it acts to slow down the object.

Front

What is the formula for calculating momentum in a two-object system?

Back

For two objects, the total momentum is calculated as p_total = p1 + p2, where p1 and p2 are the momenta of the individual objects.