Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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# Problem P. 4566. (October 2013)

P. 4566. A model car of mass m=12 kg travels on a horizontal rough surface along a circular path of radius R=5 m. It starts from rest and for a while it has a constant tangential acceleration of a0=2 m/s2, and when its acceleration reaches the value of , then it continues its motion along the circular path at constant speed.

a) Measured from the starting instant, when will the car reach the point at which it started?

b) What is the maximum of the static frictional force?

(5 pont)

Deadline expired on November 11, 2013.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. $\displaystyle a)$ 8,6 s.

$\displaystyle b)$ 48 N.

### Statistics:

 141 students sent a solution. 5 points: 55 students. 4 points: 10 students. 3 points: 49 students. 2 points: 15 students. 1 point: 8 students. 0 point: 4 students.

Problems in Physics of KöMaL, October 2013