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# 2: Force

• 2.1: Properties of Force
We now understand how to handle motion in all its forms, but really we haven’t done much in the way of physics, because we haven’t explained what causes these different motions.
• 2.2: Effects of Force
Now that we know some of the properties of force, we can at last look at the effect that forces exerted on objects has on their motions.
• 2.3: Types of Forces
We now take a closer look at the forces we have so far only mentioned in passing.
• 2.4: Problem Solving
Next we are going to focus on elements of problem-solving. We have all the tools we need, so this will not involve any new physics, but the idea is to introduce you to some common themes that come up in physics mechanics problems.

Thumbnail: A line drawing of two ice skaters demonstrating Newton's third law. Image used wtih permission (CC BY-SA 3.0 Unported; Benjamin Crowell).