Momentum and motion

Momentum and motion

Lessons

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

p=mv\vec{p} = m \vec{v}

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

m:m: mass, in kilograms (kg)

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

  • Introduction

    Introduction to momentum and motion:

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

  • 1.
    Finding the Momentum of an Object
    a)
    a 1200 kg car traveling at 20 m/s [E]

    b)
    a 0.25 kg ball thrown upward with a velocity of 30 m/s

    c)
    a stationary truck weighing 2500 kg


  • 2.
    momentum = mass ∙ velocity
    a)
    A 45 kg ice skater moving backwards has a momentum of 360 kg∙m/s. What is her velocity?

    b)
    A car travelling at 50 km/h has a momentum of 1.39×104 kg∙m/s. What is its mass?