what is the Uk? the distance? the acceleration or deceleration?
so you want the friction? oh you want to find out muon not U. O.o
A 2500 Kg car is heading east at 20 m/s. IT slams on the breaks to avoid hitting a deer. It takes the car 50 meters to stop, what is the Uk between the car and the road.
Well I've been absent for school for two days, which is coincidentally when he was teaching this stuff.
So I'm not even exactly sure what Uk is.
I assume I'd use V^2=V0^2+2da ?
I assume you want Friction
yes, you use
sub the numbers in
rearrange the equation to find a.
since Newton's second law defines where F= force of overall system not friction
using the equation
where F = friction
then rearrange the equation to find F.
you should get
To find out the reaction force, using the y directional force:
rearrange to find
, where is the force of sliding friction, and is the normal force between the surfaces in contact.
using the equation , you can determine the car's acceleration ... then use Newton's 2nd Law of motion,
, substituting for the net force ... then you can find from the equation above.