Sample Problem 5.05 Reading a force graph
When \( \vec{F}_{1} \) is horizontal,
Here is an example of where you must dig information out of a graph, not just read off a number. In Fig. 5-16a, two forces are applied to a \( 4.00 \mathrm{~kg} \) block on a frictionless floor, but only force \( \vec{F}_{1} \) is indicated. That force has a fixed magnitude but can be applied at an adjustable angle \( \theta \) to the positive direction of the \( x \) axis. Force \( \vec{F}_{2} \) is horizontal and fixed in both magnitude and angle. Figure 5-16b gives the horizontal acceleration \( a_{x} \) of the block for any given value of \( \theta \) from \( 0^{\circ} \) to \( 90^{\circ} \). What is the value of \( a_{x} \) for \( \theta=180^{\circ} \) ?
KEY IDEAS
