MG 3.1

MG 3.1

Multiple Choice

if momentum is constant, but the mass decreases, what happens to velocity?

• velocity will increase

• velocity will decrease

• velocity will stay the same

mass and velocity are indirectly related

as mass decreases, velocity increases. (The smaller an object gets, the faster it will travel)

Momentum is the product of mass and velocity.

Multiple Choice

The definition of momentum is

• mass in motion

• the velocity of an object

• the size of an object

• a comparison between 2 objects

Momentum is mass in motion.

If an object is not moving, it has no momentum. Think of momentum as an object's ability to stop.

Multiple Choice

The greater momentum an object has

• the harder it is to stop

• the easier it is to stop

Multiple Choice

If the mass of a moving object is increased but velocity remains constant, what will happen to the object’s momentum?

• momentum increases

• momentum decreases

• momentum stays the same

If mass increases and velocity stays constant, momentum will increase as well.

The more massive an object is, the more momentum it has. (The bigger the object, the harder to stop.)

Multiple Choice

The formula for momentum is

• f=ma

• p=m/v

• p=mgh

• p=mv

Multiple Choice

If the mass of a moving object is decreased but velocity remains constant, what will happen to the object’s momentum?

• momentum will increase

• momentum will derease

• momentum will stay the same

if mass decreases and velocity stays the same, momentum will decrease as well.

Mass and momentum are directly related. The smaller an object gets, momentum will decrease. (Smaller objects are easier to stop.)

Multiple Choice

What is the momentum of a 1000kg car moving north at 20 m/s?

• 20,000 kg*m/s

• 2,000 kg*/ms

• 200,000 kg*m/s

Multiple Choice

If the mass of a moving object remains constant, but velocity is decreased, what will happen to the object’s momentum?

• momentum will increase

• momentum will decrease

• momentum will stay the same

if mass stays constant, but velocity decreases, momentum will decrease.

velocity and momentum are directly related. As an object slows down, momentum decreases. (the slower an object goes, the easier it is to stop.)

Multiple Choice

If the mass of a moving object remains constant, but velocity is increased, what will happen to the object’s momentum?

• momentum will inrease

• momentum will decrease

• momentum stays the same

Multiple Choice

Calculate the momentum of a 40-kg freshman moving southward at 2 m/s using the formula p=mv.

• 40 kg*m/s

• 80 kg*m/s

• 20 kg*m/s

• 60 kg*m/s

Multiple Choice

When the velocity of an object is doubled, its momentum

• triples

• doubles

• stays the same

Multiple Choice

A tight end (m = 150 kg) and a lineman (m = 90 kg) are running down the football field. The lineman is traveling at 5 m/s. If they both have the same momentum, what is velocity of the tight end?

• 1 m/s

• 2 m/s

• 3 m/s

• 4m/s

First, figure out the lineman's momentum.

lineman-- 90kg x 5 m/s = 450 kg * m/s. If the lineman and the tight end have the same momentum, the tight end's momentum is 450 kg* m/s as well. Since we now know the tight end's mass and momentum, to find velocity, we divide momentum by mass. 450 kg* m/s / 150 kg.

Multiple Choice

Using the football players pictured above, which of the following statements would be false?

• Due to player A’s smaller mass he must run faster than player B to make their momentum equal.

• Due to player B’s higher mass he must run slower than player A to keep their momentum equal.

• If both players are running at the same speed then player A’s momentum will be less than player B’s.

• If both players are running at the same speed, then player B will have a lower momentum than player A.