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Apollinaria
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Hi everyone, I'm new to forum and am a 3rd year university student who has never taken physics until now.. I'm currently studying for a dynamics unit test and came upon this question...
A car whose brakes are locked skids to a stop in 70m from an initial velocity of 22.22m/s. Find the coefficient of kinetic friction.
Vi: 22.22m/s
Vf: 0m/s
d: 70m
a(deceleration): -3.526m/s^2
g= 9.81m/s^2
μ=?
- Found deceleration using kinematics formula Vf^2=Vi^2 =2ad
- Ff= μFn
- Fg=mg
- Fnet(y)=ma ; a(up/down)=0 ; Fnet(y)=0 ; Fn-Fg=0 ; Fn=Fg
In order to find Fn, in order to be able to solve for μ, I need to know the mass of the car... I have no idea where to even begin solving for the mass of the car using the currently known values :(
If anyone has time, please point me in the right direction.
Homework Statement
A car whose brakes are locked skids to a stop in 70m from an initial velocity of 22.22m/s. Find the coefficient of kinetic friction.
Vi: 22.22m/s
Vf: 0m/s
d: 70m
a(deceleration): -3.526m/s^2
g= 9.81m/s^2
μ=?
Homework Equations
- Found deceleration using kinematics formula Vf^2=Vi^2 =2ad
- Ff= μFn
- Fg=mg
- Fnet(y)=ma ; a(up/down)=0 ; Fnet(y)=0 ; Fn-Fg=0 ; Fn=Fg
The Attempt at a Solution
In order to find Fn, in order to be able to solve for μ, I need to know the mass of the car... I have no idea where to even begin solving for the mass of the car using the currently known values :(
If anyone has time, please point me in the right direction.
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