Question

quiz #1 kinematics
/10 ku
/14 ti
/11 app
total /35
name:-
ku = knowledge, ti = thinking, com = communication, app = application
show your complete work to get full marks. simply writing the answer will not get any marks.
multiple choice 1 mark each ku

1. which of the following is a \scalar\ quantity?

a. displacement
b. velocity
c. acceleration
d. distance
e. none of the above

1. which term describes the distance and direction of an object from a reference point?

a. acceleration
b. motion
c. velocity
d. position

1. the term \uniform motion\ means

a. speed is constant
b. velocity is constant
c. velocity is zero
d. displacement is constant
e. acceleration is constant

1. bryce leaves his home and walks 600 m due west to the library. he then walks 200 m due east and stops at the pharmacy. which equation represents bryces total displacement?

a. 600 m w + 200 m e = 800 m w
b. 600 m w - 200 m e = 400 m w
c. 600 m e + 200 m w = 800 m e
d. 600 m w - 200 m e = 400 m e

1. which of the following is a description of a vector quantity?

a) a rock falls 3 m
b) a plane flies 600 km west
c) a fish swims at 3m/s
d) a runner dog jogs for 30 min

1. study the distance - time graph pictured right and select the statement that is true.

a. the object accelerates, stops, then accelerates in the same direction.
b. the objects speed is greatest during the first segment.
c. the objects acceleration is greatest during the last segment.
d. the object travels a greater distance in the first segment than in the last segment.
e. the objects average velocity is zero.

1. an 80.4 - km trip around an oval track completing 17 complete laps takes a time of 0.75 h to complete. the average speed is

a. 93 km/h
b. 0 km/h
c. 107.2 km/h
d. 4.73 km/h
e. 107 km/hr

1. the slope of a velocity - time graph always represents

a. acceleration
b. change in acceleration
c. distance
d. change in velocity
e. displacement

Explanation:

1. Scalar quantities have magnitude only. Distance is a scalar. Displacement, velocity, and acceleration are vectors.
2. Position describes distance and direction from a reference point.
3. Uniform motion means constant speed.
4. Displacement is a vector. West is negative and east is positive, so \(600\ m[W]- 200\ m[E]=400\ m[W]\).
5. A vector has magnitude and direction. A plane flying 600 km west is a vector quantity.
6. In a distance - time graph, the object returns to the starting point, so average velocity (displacement/time) is zero.
7. Average speed = total distance/total time. Total distance is \(80.4\ km\) and time is \(0.75\ h\), so average speed \(=\frac{80.4}{0.75}=107.2\ km/h\).
8. The slope of a velocity - time graph represents acceleration.

Answer:

1. d. distance
2. d. position
3. a. speed is constant
4. c. \(600\ m[W]- 200\ m[E]=400\ m[W]\)
5. c. A plane flies 600 km west
6. e. The object's average velocity is zero.
7. c. \(107.2\ km/h\)
8. a. acceleration