5. Questions:
•What have you noticed with the objects shown
in the video?
•What makes those objects keep their circular
path?
•Is there any other factor that helps such objects
to do what they are actually doing?
7. Questions:
1. What makes the penny to be remained attached to
the hanger while the hanger is rotating?
2. Which of the materials exerts centripetal force?
9. Objectives
1. Define centripetal force and centripetal acceleration
2. Cite objects where centripetal force exists
3. Solve problems involving centripetal force and acceleration
10. Centripetal Acceleration
Change in velocity per unit of time in a uniform circular
motion
Always directed towards the center of the curvature
“center-seeking” acceleration
Magnitude of tangential velocity is the same as the
magnitude of tangential speed but both have different
direction
15. Sample problem:
Solve for the centripetal force of an 8000kg train whose speed
is 100km/h that rounds a curve whose radius is 150m.
16. Reflection
Since the centripetal force talks about a circular motion
and an object traveling a circular path will continue to have its
path as long as the centripetal force is present, this means an
endless thing and a cycle that you will go back from where you
started. Sometimes in life, when work seems to be endless and
problems keep coming back, we need to persevere more and
be patient. It has never been easy to be patient, but it’s
probably harder now than any time in history. Have you tested
your patience? How? What does it bring you? Is it true that
patience is a virtue?
17. Seatwork:
1. What is the centripetal force of a point on the rim of a 0.90m
flywheel in diameter, turning at the rate of 1200rad/min?
2. If the weight of a car traveling with a speed of 100km is 1.44
x 104 then the radius is 150m, what would be the necessary
force?