📚 Learning Guide
Friction Forces Analysis
medium

In a scenario where a block is sliding down an inclined plane, the component of gravitational force acting parallel to the incline is given by _____, where m is mass, g is the acceleration due to gravity, and α is the angle of incline.

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Learning Path
Learning Path

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Choose the Best Answer

A

m g sin(α)

B

m g cos(α)

C

m g tan(α)

D

m g

Understanding the Answer

Let's break down why this is correct

Answer

The parallel component of gravity on an incline is found by projecting the weight onto the slope, giving \(mg\sin\alpha\). This comes from decomposing the weight vector \(mg\) into perpendicular and parallel parts relative to the plane. The perpendicular part is \(mg\cos\alpha\), while the remaining component pulls the block down the slope. For example, if a 5 kg block slides on a 30° incline, the downhill force is \(5\times9. 8\times\sin30^\circ \approx 24.

Detailed Explanation

Gravity pulls straight down toward the center of the Earth. Other options are incorrect because Some people think the push from the surface, called the normal force, also pulls the block down the slope; The tangent function tells how steep a slope is, not how much force pulls the block down.

Key Concepts

Gravitational Forces
Friction Forces
Inclined Planes
Topic

Friction Forces Analysis

Difficulty

medium level question

Cognitive Level

understand

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