A force that resists motion when two things are in contact.
Friction is a **** that working in the ***** direction. It slows objects down or causes them to ****. This only happens if ***** is made. The roughter the surface is, the ****** the friction it has.
force, opposite, stop, contact, greater
What tires should be used in the winter to help people drive safely? Why do they help?
Winter tires should be used because they have special grooves to increase friciton in icy conditions.
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