2020/09/05
Centripetal force
Resistive forces
Section 6.1 1
Newton’s second law – applied along the radial direction
v2
F = mac = m r
Section 6.1 2
1
, 2020/09/05
You are riding on a Ferris wheel that is rotating with constant
speed. The car in which you are riding always maintains an
upright orientation (it does not invert).
Determine the normal force on you from the seat when you
are at the top of the ride? Give the direction and a general
equation for the normal force.
What is the direction of the net force on you when you are
at the top of the ride?
y
x
See Example 6.5 (p 132)
Section 6.1 3
If the ride is no longer one of those where you are always
upright, but you are strapped to your seat with a safety harness.
The cage in which you are seated is still rotating with constant
speed, but when you are at the top of the ride you are actually
upside down.
What is the direction of the normal force on you from the seat
when you are at the top of the ride?
What is the direction of the net force on you when you are at
the top of the ride?
y
x
Section 6.1 4
2
Centripetal force
Resistive forces
Section 6.1 1
Newton’s second law – applied along the radial direction
v2
F = mac = m r
Section 6.1 2
1
, 2020/09/05
You are riding on a Ferris wheel that is rotating with constant
speed. The car in which you are riding always maintains an
upright orientation (it does not invert).
Determine the normal force on you from the seat when you
are at the top of the ride? Give the direction and a general
equation for the normal force.
What is the direction of the net force on you when you are
at the top of the ride?
y
x
See Example 6.5 (p 132)
Section 6.1 3
If the ride is no longer one of those where you are always
upright, but you are strapped to your seat with a safety harness.
The cage in which you are seated is still rotating with constant
speed, but when you are at the top of the ride you are actually
upside down.
What is the direction of the normal force on you from the seat
when you are at the top of the ride?
What is the direction of the net force on you when you are at
the top of the ride?
y
x
Section 6.1 4
2
