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Catalyst. Notebooks today ! You are trying to build a treehouse and you have a few tools to get the job done. For each question that follows, which would give you a greater torque? a. A 0.3 m wrench or a 0.5 m wrench b. Using the 0.3 m wrench at a 75 degree angle or a 90 degree angle

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Presentation Transcript
catalyst
Catalyst

Notebooks today!

You are trying to build a treehouse and you have a few tools to get the job done. For each question that follows, which would give you a greater torque?

a. A 0.3 m wrench or a 0.5 m wrench

b. Using the 0.3 m wrench at a 75 degree angle or a 90 degree angle

c. Using the 0.5 m wrench with 200 N of force or 400 N of force

d. Using the 0.3 m wrench with 300 N of force or using the 0.5 m wrench with 250 N of force

discussion question
Discussion Question

In the game of football, when there is a linebacker (responsible for tackling the ball carrier) running at you, what are a few things that you care about regarding the linebacker?

  • How BIG he is
  • How fast he’s running
  • What direction he is running
where have you heard the word momentum before
Where have you heard the word momentum before?
  • The amount of momentum that an object has is dependent upon two variables: how much stuff is moving and how fast the stuff is moving.

MOMENTUM DEPENDS ON MASS AND VELOCITY

momentum
Momentum
  • Momentum is a vector: has a magnitude (size) and direction
  • Faster objects (greater velocity) have more momentum
  • Heavier objects (more mass) have more momentum
  • Useful for interactions between two or more objects (collisions)
thinking questions
Thinking Questions

If a bicycle and a car travel at the same speed, which has more momentum?

If one cart moves faster than another identical one, which has more momentum?

Think of a situation in which a bicycle could have more momentum than a car.

discussion question1

Greatest

Least

Discussion Question
  • Which object has the greatest momentum? Which object has the least momentum?
  • 0.45 kg baseball thrown at 30 m/s
  • 0.72 kg baseball thrown at 30 m/s
  • 0.72 kg baseball thrown at 58 m/s
  • 1.00 kg baseball sitting on a bench

What if it’s not so clear… Which object has more momentum?

Object 1: mass: 5.0 kg; velocity: 1 m/s

Object 2: mass 0.03 kg; velocity: 300 m/s

We need to be able to calculate momentum.

momentum1
Momentum

Write this equation!

  • Momentum is abbreviated: p (m is already used for mass)
  • Mass has the unit: kilogram(kg)
  • velocity has the unit: meters per second (m/s)
  • momentum has the unit: kg*m/s
example
Example
  • What is the momentum for a 0.5 kg tennis ball traveling at 56 m/s west?
guided practice
Guided Practice
  • Determine the momentum of a…
    • 60-kg halfback moving eastward at 9 m/s
    • 1000-kg car moving northward at 20 m/s
    • 40-kg freshman moving southward at 2 m/s
guided practice1
Guided Practice
  • A bicycle has a momentum of 24 kg•m/s. What momentum would the bicycle have if it had:
    • Twice the mass and was moving at the same speed?
    • The same mass and was moving with twice the speed?
    • One half the mass and was moving with twice the speed?
guided practice2
Guided Practice
  • A 1,500-kg car is driving east at 80 m/s. An identical car is driving west at 60 m/s. What is the momentum of each car?

-x

+x

final guided practice
Final Guided Practice

A 35-kg child is running at 8 m/s. What is the child’s momentum?

The child’s 80-kg parent is running after him with the same momentum. What is the parent’s velocity?

exit slip
Exit Slip

1. A 2 kg baseball is thrown with a velocity of 20 m/s. What was its MOMENTUM?

2. Which has greater momentum, Car A, which is 300 kg and moving at 50 m/s, or Car B, which is 500 kg and moving at 28 m/s?

3. Two planes are flying away from each other. Which of the following is FALSE?

a. They could both have positive momentums

b. If one plane is twice as big but flying at the same velocity, it has twice the momentum.

c. If they are the same size and going at the same speed, the magnitude of their momentums is the same.