Unit B: Changes in Motion

Lesson 2.1: Momentum

A hockey goalie wears equipment—such as leg pads and a face mask—as protection from pucks that may reach speeds of more than 150 km/h! A tennis ball can also travel at this speed. So, why don’t tennis players need to wear the same rugged protection? Thinking in terms of momentum makes this question and many other questions relating to objects in motion easier to answer.

  • Read pages 242 to 244 of the textbook. Answer the questions as you encounter them.

    Check your answers with those in the “Practice Answers” in the online course.

  • Read “2.1 Summary” on page 245 of the textbook. Then, complete “2.1 Questions”.

    Check your answers with those in the “Practice Answers” in the online course.

Go to Assignment 2.1: Momentum.