Calculating Normal Force on a Hill for a Bike and Rider - Quick HW Answers

[geauxKTM]

Homework Statement

An 80KG(bike and rider) are going over the top of a hill shaped in a circle and arch is 60m. If moving at 35m/s at top of hill what's the size of the normal force on bike and rider.

Homework Equations

The Attempt at a Solution

-849N?

 

[vigintitres]

well, for one you're going to have centripetal acceleration so when you apply the kinetic equation (using a normal-tangential coordinate system) you'll be able to get the answer pretty easily. I got N = 2418, which unlike your answer is positive indicating an upward reaction force (assuming you're coordinate system is positive upwards)