5.1 Momentum [Presentation & must do]

​Basics of Linear Momentum

​Mr. Cascabel

​Momentum

​An object in motion will have these two quantities: velocity (v) and mass (m). Together, mass and velocity makes up momentum (p). Momentum of objects are directly proportional to its mass and velocity. So a heavy object, a fast object or both can have a large amount of momentum.

​Which has a greater momentum?

​A basketball that rolls 1 m/s or a 10,000 kg tank at rest?

​Momentum

​Momentum relies on the quantity or magnitude of both the mass and velocity. If either the mass or velocity of an object is zero, the momentum will then be zero just like the parked tank.

​

p = m x v​

​

It is unclear why momentum is denoted as "p". It was the Germans and French ​who first used p to represent momentum.

Multiple Choice

The equation to calculate momentum is

• p=mv

• p=1/2mv²

• p=mgh

• p=mg

Multiple Choice

Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?

• car

• bike

• they are equal

• cannot determine using the info provided

Multiple Choice

What is the unit for momentum?

• m/s

• kg/s

• kg/m

• kg m/s

Multiple Choice

A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 

• 55 kg m/s

• 100 kg m/s

• 250 kg m/s

• 500 kg m/s

Multiple Choice

Which object listed below has the greatest momentum?

• A 0.05 kg object rolling at 0.2 m/s.
• A 0.15 kg object rolling at 2 m/s.
• A 0.15 kg object rolling at 1 m/s
• A 0.4 kg object rolling at 2 m/s.

Multiple Choice

Determine the momentum of 1000 kg car moving northward at 20 m/s ......... 

• 20000 N

• 20000 Joules

• 20000 kg m/s

• 20000 kg m/s north

Multiple Choice

If an object velocity is 0 m/s which of the is true.

• The object has momentum

• The object's momentum is changing

• The object has NO momentum

Multiple Choice

What object will have more momentum a 1000 kg truck moving 7 m/s or a 500 kg car moving 10 m/s

• Truck

• Car

Multiple Choice

The definition of momentum is

• Mass in Motion

• The size of an object

• The velocity of an object

• A comparison between two objects

Multiple Choice

If two objects have the same mass, then the faster moving object has ____________ momentum.

• more 

• less

• the same

Multiple Choice

When the speed of an object is doubled, its momentum

• remains unchanged in accord with the conservation of momentum.

• doubles

• quadruples

• decreases

Multiple Choice

A runner has a momentum of 670 kg m/s and is traveling at a velocity of 9 m/s. What is his mass?

• 74.4 kg

• 6030 kg

• 0.0134 kg

• 80 kg

Multiple Choice

Which of the following has the least amount of momentum?

• An ant walking along the ground

• An ant at rest

• An elephant walking

• An elephant running