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Self Check (Ch. 7)
Take g = 10 m s⁻² if necessary. Unless otherwise specified, neglect air resistance.
Given: sin 30° = cos 60° = 0.5 and sin 60° = cos 30° = 0.866
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1. Two blocks connected with a spring balance B are pulled on a smooth surface by a string. Find the reading of B.
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4 N
6 N
8 N
12 N
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2. Stacked blocks A and B move together when a force is applied on B. Which one best shows the direction of f (friction on A by B) and f* (friction on B by the ground)?
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A
B
C
D
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