PhysicsClassical Physics

Angela and Carlos Are Asked to Determine the Relationship Between Normal Force and Incline Angle

Derive the normal force for Angela and Carlos’s resting box, linearize their seven measurements, and explain the graph slope.

Question

Angela and Carlos are asked to determine the relationship between the normal force on a box of mass mm and the incline angle θ\theta while the box rests on the incline.

Dot on a right-rising dotted incline for Part A

A. Draw a free-body diagram at the dot. Label the forces, not their components; each force needs a distinct outward arrow whose length reflects its magnitude.

B. Begin with ∑Fy=may\sum F_y=ma_y and derive NN in terms of mm, θ\theta and constants, explaining each step.

Normal force (N)Incline angle (degrees)
9710
9515
8530
8035
7540
6350
4960

C. From the equation in B, what should be plotted to make a linearized graph? D. What does that graph's slope mean physically?

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Evidence boundary

The workbook gives no numerical mass or angle for Part A, so the force-arrow lengths can show only the relative magnitudes mgmg, mgcos⁡θmg\cos\theta, and mgsin⁡θmg\sin\theta; the illustration uses one example angle. The seven force readings are experimental observations, not exact points on an error-free theoretical line. A numerical fitted slope depends on the fitting convention, although its physical meaning remains mgmg.