Forces and Angles
Edited BY: Alaa Khazim
Edit Date: 2017-06-10 09:20:03
Question:

link for BLOSSOMS video : https://blossoms.mit.edu/videos/lessons/forces_and_angles

A vector is a quantity that has both magnitude and direction. Displacement, velocity, acceleration, and force are vectors.

In situations in which vectors are directed at angles to the customary coordinate axes, a useful mathematical trick will be employed to transform the vector into two parts with each part being directed along the coordinate axes. For example, a vector that is directed northwest can be thought of as having two parts - a northward part and a westward part.

The components of a vector depict the influence of that vector in a given direction. The combined influence of the two components is equivalent to the influence of the single two-dimensional vector. The single two-dimensional vector could be replaced by the two components.

If Fido's dog chain is stretched upward and rightward and pulled tight by his master, then the tension force in the chain has two components - an upward component and a rightward component.

Assume that the chain is exerting a 60 N force upon Fido at an angle of 40 degrees above the horizontal. A quick sketch of the situation reveals that to determine the vertical component of force, the sine function can be used and to determine the horizontal component of force, the cosine function can be used. The solution to this problem is shown below.

And now let's watch the video below, where two children are seen helping their father drag bags after work in the garden.

 

According to the above, why does the child in the orange shirt drag the bag more easily?

Question Created By: Alaa Khazim
Creation Date: 2017-05-25 14:15:40
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