cm 4 the conical pendulum (shared)
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Circular motion
A-level Physics
Unit G484: The Newtonian World
Examples of circular motion
A-level Physics
Unit G484: The Newtonian World
Examples of circular motion
Circular motion
What provides the
centripetal force in
each of these
situations?
The Moon in orbit around the Earth.
Cornering on a horizontal surface.
Cornering on a perfectly banked surface.
Protons moving around the LHC.
Moving in a circle LOs
Circular motion
Learning objectivesAt the end of the lesson you will be able to:
Lesson focus• Identifying the origins of centripetal force
• use the equation for centripetal acceleration a = v2/r ;
• use the equation for centripetal force F = ma = mv2/r ;
• identify and quantify centripetal force in a variety of
situations.
Circular motion
Learning outcomes
All of you should be able to• quantify centripetal forces for simple situations in which objects
move in horizontal circles.
Most of you will be able to• describe the variation of centripetal force on the surface of a
spinning sphere.
Some of you may be able to• describe the origin and variation of centripetal forces for motion in
vertical circles.
Circular motion
Conical pendulum LOs
To do
Explain the motion of the conical pendulum
Things to think about:
• What forces act on the pendulum?
• What is the vertical motion of the pendulum bob?
• Can you write an equation to describe the vertical forces?
• What provides the centripetal force?
Circular motion
Conical pendulum LOs
Circular motion
Questions
1. Resolve T into horizontal and vertical components (TH and TV
respectively). Label TH and TV in terms of T and .
2. What provides the centripetal force here?
T
LO 2: use the equation for centripetal force
Conical pendulum LOs
Circular motion LO 2: use the equation for centripetal force
MS
Conical pendulum LOs2824 Jan., 2009
Circular motion LO 2: use the equation for centripetal force
MS
Conical pendulum LOs2824 Jan., 2009
Circular motion LO 2: use the equation for centripetal force
MS
Conical pendulum LOs2824 Jan., 2008
Circular motion LO 2: use the equation for centripetal force
MS
Conical pendulum LOs2824 Jan., 2008
Circular motion LO 2: use the equation for centripetal force
MS
Conical pendulum LOs2824 Jan., 2008
Circular motion LO 2: use the equation for centripetal force
2824 Jan., 2008
MS
Conical pendulum LOs
Circular motion LO 2: use the equation for centripetal force
MS
Conical pendulum LOs2824 Jan., 2008