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Question 3

From Physics HL Paper 1 (May 2024, TZ2)

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  1. A block X of weight 10 N is stacked on a block Y of weight 20 N. Block X is fixed to a wall with a light string. The coefficients of static friction between the blocks and between block Y and the ground are both 0.2.
Diagram showing two blocks, X and Y, with block X on top of block Y. Block X is connected to a wall by a string. A force F is applied to block Y.
Diagram showing two blocks, X and Y, with block X on top of block Y. Block X is connected to a wall by a string. A force F is applied to block Y.

What is the value of the minimum force F required to move block Y and what is the tension T in the string immediately before block Y begins to move?

Table showing possible values for minimum force F and tension T.
Table showing possible values for minimum force F and tension T.

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