The next 3 problems are about a toy bridge, built as shown in the figure, with a

Question

The next 3 problems are about a toy bridge, built as shown in the figure, with a massless wooden plank lying horizontally over two support posts. The left support post exerts a force F_L on the plank. The right post exerts a force F_R on the plank. There is a massive toy car rolling across the bridge from point P2 to point P3, (i.e. from left to right). Describe the force F_L as the car rolls from P2 to P3. It is upwards, and increasing in magnitude. It is upwards, and decreasing in magnitude. It is upwards, and constant. It is downwards, and increasing in magnitude. It is downwards, and decreasing in magnitude. In the previous problem, what can you say about the sum F_L + F_R as the car rolls from P2 to P3? It is upwards, and increasing in magnitude. It is upwards, and decreasing in magnitude. It is upwards, and constant. It is downwards, and constant. None of the above. In the previous problem, what can you say about the magnitude of the net torque (i.e. the sum of all torques) about the pivot point P1, as the car rolls from P2 to P3? It is increasing. It is decreasing. It is constant, and zero It is constant, and non-zero. Not enough information is given to answer.

Explanation / Answer

8. option (B)

9. option(C)

10. option(C)

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