# Friction – Physics 101 / AP Physics 1 Review with Dianna Cowern

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From Physics Girl.

Lesson 6 (Friction) of Dianna’s Intro Physics Class on Physics Girl. Never taken physics before? Want to learn the basics of physics? Need an AP Physics 1 review before the exam? This course is for you!

Exercises in this video:
Problem1: The coefficient of friction between your car’s tires and concrete is 0.7. Your car’s mass is 1000kg. If you slam on your brakes and the tires lock, what is the magnitude of the sliding friction force acting while you slide? What is your acceleration?

Problem 2: You put your cow on a ramp. Moo. Then you tilt the ramp up, slowly. Just when your cow starts to slide, you measure the ramp angle as 34º. What is the coefficient of static friction between the cow and the ramp?

Thank you to atrophysicist Naomi Rowe-Gurney for her awesome shoutout at the end of the video! You can follow her on Twitter @nrowegurney

Credits:
Dianna Cowern – Executive Producer/Host/Writer
Jeff Brock – Lead Writer/Course Designer
Laura Chernikoff – Producer
Victoria C. Page – Video Editor
Sophia Chen – Researcher/Writer
Erika K. Carlson – Researcher/Writer
Hope Butner – Production Assistant
Levi Butner – Videographer
Lauren Ivy – Set Design
Vanessa Hill – Consulting Producer
Aleeza McCant – Illustrator
Rachel Allen – Illustrator
Consultant – Kyle Kitzmiller
Lucy Brock, Samantha Ward – Curriculum Consultants
Cathy Cowern – Transcription