Chapter Test

1. A 10 kg block is pulled with a 40 N force at 30° above the horizontal on a rough surface. Find acceleration if μₖ = 0.2.
2. Two blocks, 3 kg and 5 kg, are connected by a rope over a frictionless pulley. Find acceleration and tension.
3. A block slides down a 25° incline with μₖ = 0.15. Find its acceleration.
4. A 6 kg block on a table is pulled by a hanging 4 kg mass over a pulley. Compute acceleration and tension.
5. A 12 kg block on a rough incline has μₛ = 0.4. Find the minimum angle where it begins to slide.
6. Explain why normal force can be less than weight on an incline.
7. Compare static and kinetic friction with examples.
8. Describe the role of tension in a multi-block system on an incline.
9. A 20 kg block is pushed with 60 N on a flat surface. If μₖ = 0.3, find acceleration.
10. Explain how Newton’s Third Law applies to the block–surface interaction.