Exercises friction - exercise sheets with practice problems PDF

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Friction and Springs – Exercises 1) What is friction? 2) Obtain the static and kinetic friction of a 100 kg block resting on a surface. The static and kinetic friction coefficients are μs =0.5 and μk =0.3 . 3) What is the value of the static coefficient if a 50 kg block is being pushed by a 350 N force and the whole system is at rest?

4) Obtain the acceleration of a 10 kg block that it is being pushed to the right by F = 200 N force. The static and kinetic friction coefficients are μs =0.5 and μk =0.3 .

5) The following figure shows a 50 kg block diagram with forces acting on it. Find the acceleration of the block if the static and kinetic friction coefficients are μs =0.6 and μk =0.3 m ax 100 N 60° 400 N

50 N 30° FF W

N

6) What are springs? 7) A spring with a constant of 50 N/m is being compressed 5 cm to the left, what is the force?

8) A spring with a constant of 75 N/m is being pulled 15 cm to the right, what is the force? 9) Find the equivalent spring constant if two springs with different spring constants are attached in series.

10) What is the equivalent spring constant if two springs with different spring

constants are attached parallel? ....