Physics 1.3 - Vectors And Scalars
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Which of the following is not a vector?
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Area
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Weight
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Electric field
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Volume
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Physics 1.3 - Vectors and Scalars explores fundamental concepts through problems on vector identification, scalar properties, vector displacements, and vector component analysis. This quiz enhances understanding of directional quantities and their applications.
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- 2.
Which of the follwing is not a scalar?
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Speed
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Work
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Displacement
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Temperature
Correct Answer
A. DisplacementExplanation
Speed only describes how fast an object moves but not the direction. So it is a scalar. A is incorrect.
Work describes how much energy a force changes. It is a scalar as the energy. B is incorrect.
Distance is the path length, and it is a scalar. But displacement indicates the direction is from the starting point to the ending point, so it is a vector.
Temperature describes how warm an object is and it has only magnitude and no direction. So temperature is scalar. D is incorrect.Rate this question:
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- 3.
A person walks 4 km north, and then walks 8 km west, and then he walks 2km north. How far away is he from his starting point?
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14km
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2km
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8km
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10km
Correct Answer
A. 10kmExplanation
The above graph shows the person walking. The red vector is the sum of the three blue vectors and we are looking for its magnitude. We can calculate the magnitude by drawing the dash lines, then the red line is the hypotenuse of the right triangle with one side 6 km and the other side 8 km.
We can use the Pythagorean theorem to calculate the length.
lenght =Rate this question:
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- 4.
If the initial velocity vector is 3 m/s to the east, and the final velocity vector is 3 m/s to the south, what is the change in velocity?
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0 m/s
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6 m/s to the southeast
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4.2 m/s to the southeast
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4.2 m/s to the southwest
Correct Answer
A. 4.2 m/s to the southwestExplanation
The change of velocity is equal to the final velocity subtracted by the initial velocity, which is equal to the final velocity add the negative initial velocity. We can calculate the change using the Pythagorean theorem = =
The direction is southwest as shown in the graph.Rate this question:
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- 5.
A person is dragging a box to the left upward with a force of 10 N. The force forms angle of 60 degrees with the horizontal. What is the horizontal and vertical component of this force if we choose the upward and the right to be the positive direction?
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Horizontal 5N Vertical 8.7N
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Horizontal 8.7N Vertical 5N
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Horizontal 5N Vertical 5N
Explanation
We can see in the graph that the horizontal component is the adjacent side of the 60 degree angle, so we can use cosine and the vertical component is the opposite side of the 60 degree angle, so we can use sine.
horizontal component =
vertical component =
Then we notice that the horizontal component is to the left, which is opposite of the direction we define as positive. So the correct answer is -5N for horizontal component. The vertical component is positive, and it is 8.7N.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
ProProfs Editorial Team -
Dec 10, 2012Quiz Created by
Marcbrunssen
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