# Forces: page 4

This unit includes circular motion and gravitation.

Forces: page 1 (Videos 1 to 6: Newton's 3 laws of motion, 1-dim single-object problems)

Forces: page 2 (Videos 7 to 11: Multi-object problems, 2-dim single-object problems)

Forces: page 3 (Videos 12 to 18: Friction, incline, and pulley problems)

Forces: page 4 (Videos 19 to 26: Circular motion)

Forces: page 5 (Videos 27 to 31: Tangential & radial acceleration, inertial & non-inertial reference frames, gravitation)

Forces: page 6 (Videos 32 to 37): Weightless situation, multiple-choice questions, air resistance, and banked road)

• AP Physics 1: Forces 19: Circular Motion 1: Centripetal Acceleration and Centripetal/Centrifugal Force
• AP Physics 1: Forces 21: Circular Motion 3: Mass kept in Horizontal Circle by Other Mass
• AP Physics 1: Forces 22: Circular Motion 4: Tarzan Swinging on Vine
• AP Physics 1: Forces 23: Circular Motion 5: Whirling Water Cup and Roller Coaster Problems
• AP Physics 1: Forces 24: Circular Motion 6: Ferris Wheel
• I was trying to find a good Ferris wheel to use for this problem. I looked at those giant Ferris wheels and found that they are usually for sightseeing and therefore move slowly and have small acceleration. Remember we feel acceleration? Lower acceleration provides better comfort : ) So for the problem used in this video lesson, I chose the Ferris wheel in Youtube video: http://www.youtube.com/watch?NR=1&v=1GG7ajmWtKY&feature=fvwrel . I estimated the radius and measured its rate of rotation to get the r = 9m and the 6 rev/min for the problem
• AP Physics 1: Forces 25: Circular Motion 7: Car on Hilly Road
• AP Physics 1: Forces 26: Circular Motion 8: The Rotor Ride
• For this video lesson, I used the rotor in the Youtube video: The Rotor ride @ Lake Compounce at http://www.youtube.com/watch?v=uz_DkRs92pM . I estimated the radius and measured its rate of rotation to get the r = 1.9m and the 30 rev/min for the problem in this video lesson.

Forces: page 1 (Videos 1 to 6: Newton's 3 laws of motion, 1-dim single-object problems)

Forces: page 2 (Videos 7 to 11: Multi-object problems, 2-dim single-object problems)

Forces: page 3 (Videos 12 to 18: Friction, incline, and pulley problems)

Forces: page 4 (Videos 19 to 26: Circular motion)

Forces: page 5 (Videos 27 to 31: Tangential & radial acceleration, inertial & non-inertial reference frames, gravitation)

Forces: page 6 (Videos 32 to 37): Weightless situation, multiple-choice questions, air resistance, and banked road)