READ

Read Ch. 7 (pp 86-92)

Answer: “Review Questions” 1-11

3.2: LEARNING TARGET 1

What will I be able to do when I’ve finished this lesson?

The student can describe similarities and differences between inertia and momentum

What idea, topic, or subject is important for me to learn and understand so that I can do this?

To be able to do this, I must learn and understand…• What momentum is• How momentum is measured• How momentum is calculated

What will I do to show that I can do this, and how well will I have to do it?

I will show my understanding of momentum by…• Creating a scenario showing 1) an object with no

momentum, 2) an object with a lot of momentum, but little inertia, and 3) an object with a little momentum, but a lot of inertia

• Identifying the units used to measure momentum• Identifying the equation used to calculate momentum

MOMENTUM

Momentum is moving inertia!

How do we measure momentum?

What can have momentum, moving object, objects at rest, or both?

What equation will help us calculate momentum?

What units can this equation give us?

Is this a newton (N)?

Is momentum a vector or scalar?

INERTIA VS. MOMENTUM

P = MV

momentum = mass X velocity

REFLECTION:

Creating a scenario showing:1) an object with no momentum,

2) an object with a lot of momentum, but little inertia, and

3) an object with a little momentum, but a lot of inertia

3.2: LEARNING TARGET 2

What will I be able to do when I’ve finished this lesson?

The student can solve for various quantities using the momentum equation

What idea, topic, or subject is important for me to learn and understand so that I can do this?

To be able to do this, I must learn and understand…• What momentum is• How momentum is measured• How momentum is calculated• Manipulate the momentum equation for various

quantities• Solve problems using the momentum equation

What will I do to show that I can do this, and how well will I have to do it?

I will show my understanding of momentum by…• Calculating problems using the momentum equation• Creating three word problems involving the

momentum equation, one to find momentum, one to find mass, and one to find velocity.

P = MV

momentum = mass X velocity

PROBLEM:

What is the momentum of a 10 kg ball that is moving at 10 m/s?

PROBLEM:

Calculate the momentum for a 1,000 kg racecar that was moving at 100 mph during a race that has come to a complete stop making a pit-stop.

PROBLEM:

How much momentum does a 1,000 gram box have if it is sliding down a ramp at 5 m/s.

PROBLEM:

Calculate the weight of a box that is moving at 20 km/h with a momentum of 100 kg•km/h.

PROBLEM:

If a 500 kg moose has a momentum of 10,000 kg•mph, how fast is it moving?

PROBLEM:

If a dog weighs three times as much as a cat, how much faster will the cat have to run in order to have the same momentum?

PROBLEM:

If a car has 10,000 times the mass of a bicycle, how much faster will the bicycle have to go in order to have the same momentum as the car?

PROBLEM:

A 5 kg box is moving at 20 m/s, how fast does a 25 kg box have to move in order to have the same momentum?

PROBLEM:

If a large meteor, that happens to be 10,000 times bigger than another small meteor, is moving through space at 1,000 m/s, how fast would the small meteor have to be moving to have the same momentum?

PROBLEM:

How much momentum will a 1,000 N end have, moving at 2 m/s, when he tackles someone?

PROBLEM:

If a horse weighs 5000 N, and it takes it 3 seconds to run 60 meters, what is the horse’s momentum?