A spring of stiffness 2 kN/m is attached to a block of mass 8 kg on a surface that has frictional co efficient 0.4. The spring is
compressed and released, and the block accelerates at 4 m/s7 just as it is released. The work done in compressing the spring is:
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Explanation:
Contact force is the resultant of Frictional force and normal reaction force.
The frictional force can be calculated as =0.5xmgcosθ.=0.5x2x10x
2
3
normal reaction force is mgcosθ.=2x10×
2
3
They are at 90
0
to each other therefore find out their resultant and that shall be the resultant contact force.
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