Lesson 13: Centripetal Force
Overview:
Have you ever played a racing game and wanted to know how drifting works? In this lesson you will explore the physics of drifting.


Curriculum Expectations:
Overall Expectations:
B2. Investigate, in qualitative and quantitative terms, forces involved in uniform circular motion and
motion in a plane, and solve related problems.
B3. Demonstrate an understanding of the forces involved in uniform circular motion and motion in a plane.
Specific Expectations:
B2.1 Use appropriate terminology related to dynamics, including, but not limited to: inertial and noninertial frames of reference, components, centripetal, period, frequency, static friction, and kinetic friction.
B2.6 Analyse, in qualitative and quantitative terms, the forces acting on and the acceleration experienced by an object in uniform circular motion in horizontal and vertical planes, and use freebody diagrams and algebraic equations to solve related problems.
B2.7 Conduct inquiries into the uniform circular motion of an object (e.g., using video analysis of an amusement park ride, measuring the forces and period of a tether ball), and analyse, in qualitative and quantitative terms, the relationships between centripetal acceleration, centripetal force, radius of orbit, period, frequency, mass, and speed.
B2. Investigate, in qualitative and quantitative terms, forces involved in uniform circular motion and
motion in a plane, and solve related problems.
B3. Demonstrate an understanding of the forces involved in uniform circular motion and motion in a plane.
Specific Expectations:
B2.1 Use appropriate terminology related to dynamics, including, but not limited to: inertial and noninertial frames of reference, components, centripetal, period, frequency, static friction, and kinetic friction.
B2.6 Analyse, in qualitative and quantitative terms, the forces acting on and the acceleration experienced by an object in uniform circular motion in horizontal and vertical planes, and use freebody diagrams and algebraic equations to solve related problems.
B2.7 Conduct inquiries into the uniform circular motion of an object (e.g., using video analysis of an amusement park ride, measuring the forces and period of a tether ball), and analyse, in qualitative and quantitative terms, the relationships between centripetal acceleration, centripetal force, radius of orbit, period, frequency, mass, and speed.
Success Criteria:
 Is centripetal force an actual force?
 Describe the centripetal force acting on an object moving under uniform circular motion.
Time Allocation: 3 hours
Learning A
ctivities:Read pages 120  123 from Nelson 3.3
In the playlist below, video:
 Will show you how to calculate the centripetal acceleration of an object traveling in a 5m circular path using Newton's Second Law of motion.
 Will show you how to calculate the centrifugal force and tension of a mass spinning in a circle (vertically).
 Will show you how to calculate the max. velocity before a car would skid off a turn.
 Will show you how to calculate the max. velocity before a car would skid off a turn on an icy banked road.
Newton's Second Law and Rotational Motion: Roller Coasters

The rotor or gravitron is an amusement ride: the riders are stuck to the wall of a rotating cylinder while the floor is retracted. This animation shows the 3 forces acting on a rider: gravity, friction and normal force.


Will show you how to calculate the min. velocity to needed keep a person from slipping off a spinning cylinder. 

Will show you how to calculate the min. velocity to needed keep a rollercoaster from falling to earth.

Practice questions 1, 2, and 3 on page 123.
Task:
Solve questions 2, and 4 from Nelson 3.3 Review on page 124.
Complete the Physics of Roller Coaster Assignment on Moodle.
Quiz Chapter 3 on Moodle.
Optional Extension:
Complete the Physics of Roller Coaster Assignment on Moodle.
Quiz Chapter 3 on Moodle.
Optional Extension:
 Solve questions 3, and 5 on page 124.
Reflect:

Have you ever wondered what Taylor Swift has to do with Physics? Watch the video to see some of the contributions she has in the field of banked curved physics.

Additional Resources:
Will show you how to calculate the max. velocity before a car would skid off a turn on a banked road.


Will show you how to calculate the max. velocity a dunebuggy can have before going airborne.

