# 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

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

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

$m:$ mass, in kilograms (kg)

$\vec{v}:$ 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?