# Grade 11 Physics Unit 1: Kinematics and Dynamics Quiz Solutions

Mechanics

Oct 30, 2013 (4 years and 6 months ago)

95 views

Grade 11 Physics Unit 1: Kinematics and Dynamics Quiz

Solutions

Multiple Choice

Identify the choice that best completes the statement or answers the question.

1.

Which of the following is a "scalar" quantity?

a.

velocity

d.

acceleration

b.

displacement

e.

none of the above

c.

distance

2.
A spark timer/air table produced the tape pictured below. The object, moving to the right, was

a.

slowing down

b.

accelerating then moving with constant speed

c.

moving with uniform motion

d.

travelling with constant speed

e.

speeding up

3.
A 400
-
m, 800
-
m, and 1600
-
m race are all run around the same 400
-
m oval track. The winning times for the races were 50 s,
2 min, and 4 min 10 s respectively. Which of the following statements is true?

a.

All runners have the same average velocity.

b.

All r
unners have the same average speed.

c.

The 800
-
m runner has the greatest average velocity.

d.

The 1600
-
m runner has the greatest average velocity.

e.

The 400
-
m runner has the greatest average velocity.

4.
The position
-
time graph pictured below represents the motions of two objects, A and B. Which of the following statements
concerning the objects' motions is true?

5.
The position
-
time graph pictured below depicts a person, P, running to catch a bus, B, that has just begun to pull away.
Which of the following statements is true?

a.

Object A has the greater speed.

b.

Object A is travell
ing for a longer period of time.

c.

Object B travels the greater distance.

d.

Both objects have the same speed at the point where the lines cross.

e.

Object A leaves the reference point at an earlier time.

a.

The person has two opportunities to catch up to the b
us.

b.

The person's speed is always greater than that of the bus.

c.

The speed of the bus is always greater than that of the person.

d.

The person's acceleration is greater than that of the bus.

e.

The person has no chance of catching the bus.

Problem

6.

A group of hikers sets out from point A, proceeds to B, then to C, and finally to D. The entire trip takes 6.0 h.

(a)

Determine the hikers' average speed for the trip.

(b)

What is the hikers' final displacement relative to their initial position?

(c)

If the hikers release a homing pigeon upon their arrival at point D and the bird re
turns to point A 30 min later, what
is the bird's average velocity during the flight?

(a)

distance travelled: 2.0 km + 8.0 km + 8.0 km = 18.0 km

average speed

The hikers' average speed is 3.0 km/h.

(b)

hiker's displacement

The final displacement is 10.0 km [53
º
E of S].

(c)

displacement of homing pigeon on return trip

10.0 km [53
º
W of N]

(opposite displacement of hikers)

average velocity

The bird's average velocity is 20 km/h [53
º
W of N].

7.
A boat sets out from the north shore of a 200 m wide east
-
flowing river. The boat always faces due south but the current carries it
300 m downstream while crossi
ng. The trip takes 2.0 min. Assume three significant digits.

(a)

What is the boat's displacement during the trip?

(b)

What is the boat's average velocity during the trip?

(c)

If the boat's velocity relative to the water is 1.7 m/s [S], what is the velocity

of the current?

(a)

boat's displacement

The boat's displacement is 360 m [56

E of S].

(b)

average velocity

The boat's average velocity is 3.00 m/s [56

E of S].

(c)

velocity of current

The velocity of the current is 2.5 m/s [E].