+ All Categories
Home > Documents > Friction. Warm up Come in quietly, get your journal from the appropriate bin, complete the following...

Friction. Warm up Come in quietly, get your journal from the appropriate bin, complete the following...

Date post: 22-Dec-2015
Category:
Upload: georgia-zoe-dixon
View: 213 times
Download: 0 times
Share this document with a friend
Popular Tags:
20
Friction
Transcript

Friction

Warm up• Come in quietly, get your journal from the

appropriate bin, complete the following on the next available page:

• Draw the force diagram of Susie pushing her bike to the left with 400 N of force, and Roger pushing his bike to the right with 800 N of force. (Remember arrow size and direction)

• Draw the force diagram of a falling bowling ball weighing 20 N (Remember gravity is a force).

Two Masses Falling

Steel Ball and a Feather

Standards

• S8P3b. Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction.

Daily Goals

• Explain how friction works• Give examples of the two types of friction• Explain how friction can be helpful and

harmful

Essential Question

• How does friction help football players?

Important

• Test Friday, Nov. 18• Practice Sheet #12 due Friday, Nov. 18• Study Guide due Friday, Nov. 18 for extra

credit

Friction

• Friction - a force that opposes motion between two surfaces that are in contact

Direction of Friction

• Friction always works in the direction opposing motion

Friction

Types of Friction

• Two main types of friction– Static friction – occurs when a force is applied to

an object but does not cause motion– Kinetic friction – Friction between moving surfaces

Warm Up

• Come in quietly, get your journals, and have a seat.

• Open your journals and complete the writing prompt “A World without Friction”

• You have ten minutes to be finished. (Not just starting, but completely finished. Finished means several complete sentences addressing the prompt). For a grade.

Kinetic Friction

• Three types– Rolling– Sliding– Fluid

Types of Friction

How to Increase/Decrease Friction

• Greater forces applied to the object increase friction

How to Increase/Decrease Friction

• Rougher surfaces on the objects increases friction

VS.

How to Increase/Decrease Friction

• The amount of area in contact does not affect friction

How to Increase/Decrease Friction

Friction - Helpful

Friction - Harmful


Recommended