Physics topic 2

Consider a 12 unit vector and a 7 unit vector. Which is NOT a possible magnitude of the resultant of the two vectors? a) 3 units b) 15 units c) 18 units d) 5 units e) 10 units

A

Consider a 6 unit vector and a 4 unit vector. What is smallest possible magnitude of the resultant of the two vectors? a) 2 units b) 0 units c) 10 units d) 5 units e) 1.5 units

A

What is a projectile?

Any object moving only under the influence of gravity. (vertical only motions)

When adding vector B to vector A geometrically (or graphically) using the head to tail method, the resultant is drawn from ____ to the ____. a) head of A, tail of B c) head of B, tail of A b) tail of A, head of B d) tail of B, head of A

B

Which of the following quantities are vectors? Select all that apply. a) distance traveled d) average velocity b) displacement e) instantaneous velocity c) average speed f) acceleration

B, D, E, F

What is trajectory?

The path of a projectile.

What is a parabolic?

The shape of the trajectory.

True or False: The horizontal and vertical parts can be treated as straight-line motions.

True

What is the sum of vectors called?

resultant

An object moves 4 m east, then 7 m west, and finally 5 m east. What is the total distance traveled? a) 2 m b) 9 m c) 16 m d) 7 m e) 0 m

C

Consider the diagram below. Which of the following vector additions is shown? a) A + B = C b) A + C = B c) B + C = A d) C + A = B

C

Consider a 5 unit vector and an 8 unit vector. What is largest possible magnitude of the resultant of the two vectors? a) 5 units b) 8 units c) 3 units d) 13 units e) 40 units

D

Does the resultant in a vector addition diagram always extend from the head of the last vector to the tail of the first vector?

No, it's the tail of the first to the head of the last.

If vectors A, B, and C are added together as A + B + C and the order reversed to C + B + A, then would the vector still have what kind of magnitude? What kind of direction? (different, opposite, same)

Same magnitude, same direction.

What is range? (pertaining to projectiles)

The horizontal distance from start until the projectile lands.

An object moves 4 m east, then 7 m west, and finally 5 m east. What is the total displacement? a) 15 m, east b) 2 m, east c) 16 m, east d) 2 m, west

B

Which of the following statements are true of vector addition, vector subtraction, and vector addition diagrams? List all that apply. a) Vectors A, B, and C are added together as A + B + C. If the order in which they are added is changed to C + B + A, then the result would be different. b) Vectors A, B, and C are added together as A + B + C. If the order in which they are added is reversed to C + B + A, then the result would be a vector with the same magnitude but the opposite direction. c) When constructing a vector diagram for A + B + C, it is not absolutely necessary that vectors B and C use the same scale that is used by vector A. d) The resultant in a vector addition diagram always extends from the head of the last vector to the tail of the first vector. e) If vectors A and B are added at right angles to each other, then one can be sure that the resultant will have a magnitude that is greater than the magnitudes of either one of the individual vectors A and B. f) If vectors A and B are added at right angles to each other, then one can be sure that the resultant will have a magnitude that is less than the arithmetic sum of the magnitudes of A and B. g) Vector addition diagrams cannot be used to determine the resultant when there is a vector subtraction operation.

E & F A) No, vector addition is commutative B) No, same direction, i.e. the same result. C) If you want a realistic diagram for which you can actually estimate the answer, the scales must be the same. D) Opposite: From the tail of the first to the head of the last. E) The resultant is the hypotenuse F) The resultant is the hypotenuse G) You just add the negative vector