Forces and Angles
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?

2 People tried to answer this question

### He activates a smaller horizontal force.

The horizontal force component is the component in the direction of the movement and therefore when it is greater the movement will be faster

The horizontal force component is the component in the direction of the movement and therefore when it is smaller the movement will be slower

The vertical force component does not affect in the horizontal direction movement

The vertical force component does not affect in the horizontal direction movement

 Points on map:
1.  Hajir Reham (28.06.2017 am 11.20.10)
Peer Feedback - Forces and Angles

### Therefore, a suggestion to improve the question is to add numerical values to the vector and especially the value of the angle to sharpen the difference in the angle of the force exerted by the two children. In other words a student who solves the question is not supposed to assume that the angel is smaller or bigger based on the vectors that were drown in the video, it supposed to be clear by adding an informative sentence that the angel which is operated by the boy who wears orange shirt is smaller. Since we as teachers always warn our students to draw conclusions about angles without numerical or comparative values.

History of edits
Edited BY: Alaa Khazim Edit Date: 2017-06-10 09:20:03
Edited BY: Alaa Khazim Edit Date: 2017-05-25 14:56:56
Created By: Alaa Khazim Edit Date: 2017-05-25 14:17:23
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