A student is investigating the acceleration of a block of mass \(m\) sliding on a rough horizontal surface with a coefficient of kinetic friction \(\mu_k\). The student applies a constant force of magnitude \(F_A\) to the block at an angle \(\theta\) with the horizontal. Two different methods are used: - **Case 1:** The block is pulled by a string at an angle \(\theta\) above the horizontal. - **Case 2:** The block is pushed by a rigid rod at an angle \(\theta\) below the horizontal. In both cases, the block accelerates to the right and remains in contact with the surface. • Nerd Notes

AP Physics 1

2.7 Kinetic and Static Friction

2.5 Newton’s Second Law

2.2 Forces and Free-Body Diagrams

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