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Momentum and motion

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Intros
Lessons

  1. Introduction to momentum and motion:

    • the term "momentum" in everyday usage versus the physics definition
    • standard units for momentum calculations
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Examples
Lessons
  1. Finding the Momentum of an Object
    1. a 1200 kg car traveling at 20 m/s [E]
    2. a 0.25 kg ball thrown upward with a velocity of 30 m/s
    3. a stationary truck weighing 2500 kg
  2. momentum = mass ∙ velocity
    1. A 45 kg ice skater moving backwards has a momentum of 360 kg∙m/s. What is her velocity?
    2. A car travelling at 50 km/h has a momentum of 1.39×104 kg∙m/s. What is its mass?
Topic Notes
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In this lesson, we will learn:

  • the term "momentum" in everyday usage versus the physics definition
  • standard units for momentum calculations
  • problem solving with momentum

Notes:

  • Momentum is the "quantity of motion", and can be thought of as how difficult it is to stop an object in motion.

Momentum

p⃗=mv⃗\vec{p} = m \vec{v}

p⃗:\vec{p}: momentum, in kilogram meters per second (kg∙m/s)

m:m: mass, in kilograms (kg)

v⃗:\vec{v}: velocity, in meters per second (m/s)