## Forces Objectives

We are starting the Forces unit. Here is a summary of what you are responsible for in this unit:

 # Objective Must-do Activities Videos 1 Explains the possible effects of a frictional force Forces Test Types of Forces 2 Calculates the force of gravity on an object System of Forces worksheet, Forces Test Types of Forces 3 Explains the effect of centripetal force on a body in motion Forces Test Types of Forces 4 Draw properly labeled free body diagrams that show all forces acting on an object System of Forces worksheet, Forces Test Free Body Diagrams 5 Determine the magnitude and direction of the resultant force for a system of forces System of Forces worksheet, Forces Test Free Body Diagrams, Resultant Forces 6 Determine the magnitude and direction of the balancing force for a system of forces System of Forces worksheet, Forces Test Free Body Diagrams, Resultant Forces, Equilibrium

## Uncertainty in Measurement

Please watch this video. Note that at 13:50, there is an error: (1.25 + 0.45) should have brackets around it.

When you are finished, tweet one (or more) questions about the video. Use the hashtag #LEARNuncertainty. Your questions could be:

• related to something that you don’t understand
• a question you think I might ask you
• a question that you think students would commonly have

## Free Fall Investigation

We will be doing our second hands-on lab of the year on November 2nd, when we will be investigating the motion of an object in free fall. Please take a look at the required materials below:

• ticker tape timer machine (110V or battery) – also known as an acceleration timer machine
• carbon paper
• ticker tape
• ruler