
Arc Tutor Liknayan Quiz - Scalars, Vectors and Vector Algebra
Authored by Arctutor Series
Physics
9th Grade

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8 questions
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1.
CATEGORIZE QUESTION
3 mins • 5 pts
Groups:
(a) Scalar Quantities
,
(b) Vector Quantities
The directed distance between your house and your school
The velocity of a volleyball being spiked by a sports team
Gravity acting downward on a falling ball
The number of fingers a person has on each hand
The reading on a car's speedometer
The kinetic energy of a rolling ball
The potential energy of a compressed spring
The velocity of a runner going around a track field
The wattage of a 10V Battery
The momentum of two colliding balls
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following represent the vector going from the point (2,3) to the origin?
(-2,-3)
<2,3>
<-3,-2>
<-2,-3>
Answer explanation
We are going from quadrant 1 to the origin so the x and y components of the vector should both be negative.
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Choose 2. Which of the following represent the same vector?
The vector from the origin to the point (3,4)
The vector from (3,4) to the origin
The vector from (2,5) to the point (5,9)
The vector from the origin to the point (4,3)
Answer explanation
Vectors do not always need to start from the origin, so long as the components along the x and the y are the same, they are the same vector
4.
MATH RESPONSE QUESTION
2 mins • 1 pt
Given two vectors A and B, where A is parallel to the y axis, and B is parallel to x axis. Find their dot product.
Mathematical Equivalence
ON
Answer explanation
Since we have two perpendicular vectors, their dot product is zero.
5.
MATH RESPONSE QUESTION
1 min • 1 pt
Compute: <2, 5> x <9, 8>
Mathematical Equivalence
ON
Answer explanation
Simply apply the formula:
<x1,y2>x<x2,y2>=x1y2-x2y1
6.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
Given the polar vector R <5√2, π/4>. Write R as a cartesian vector.
Note that the angle π/4 is in radians
(a)
7.
MATH RESPONSE QUESTION
2 mins • 4 pts
A basketball player shoots a free throw with an initial velocity of 8.07 m/s at an angle of 49.6 degrees above the horizontal.
Represent the vector of the ball's velocity in both Polar and Cartesian form and plot the cartesian vector of the ball's velocity.
Mathematical Equivalence
OFF
Answer explanation
Due to limitations of the Quizziz platform we will be checking your solutions uploaded. The exact answer is the following
Polar Vector: <8.07, 49.6°>
Cartesian Vector: <5.23,6.15>
The plot is shown here.
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