CH 1,2 SAMPLE
PROBLEM TYPE
QUESTIONS

**2]** A turtle is observed to travel at the rate of 0.50 cm/s.
Assuming
he travels on a straight line,

how long (in hours) will
it take him to travel 1.6 km?

ANSW: 89 hrs

**3]** A train travels uphill from station A to station B in 6.0
hours. It makes the return trip downhill

in 4.0 hours. If its average
speed for the entire trip (uphill and downhill) was 48 km/hr,

determine the speed for
each part of the trip. { __i.e.__, give speed in going from A to B

and speed in going from
B to A}

ANSW: A to B is 40 km/hr , B to A is 60
km/hr

**4] **A ball is thrown vertically downward from a height of 55.0
m above the ground. It reaches the

ground 2.60 s later. What
is the velocity of the ball just before striking the ground?

( a = -9.80 m/s^{2 }for
gravity)

ANSW: - 33.9 m/s

**5]** A) An object moves with constant
speed
from position 0 m to position +5 m during an

interval of 2 seconds. It
remains at position +5 m for one second, then it returns at constant

speed to position 0 m during
an interval of 2 seconds.

FIRST: make a sketch of position versus time for the above object.

SECOND: describe (a calculation is not necessary) the average **velocity**
for the entire

motion of the object.

ANSW: average velocity is zero

(B) An object has
an
initial velocity of **+ 2 m/s**. It is then subjected to a constant
acceleration

of** - 0.5 m/s ^{2}** for many many seconds. Qualitatively
describe
what happens to the velocity

of the object during this acceleration.

ANSW: Object behaves just like a ball tossed upward against gravity

the bridge?

ANSW: 30.6 m

B) A second rock is then
thrown straight down from the same bridge and reaches the water

in only 1.25 seconds. What was the velocity of the rock just before
striking
the water?

ANSW: -30.7 m/s

2] A) It is known that 1.00 m^{3 }of
aluminum has a mass of 2.70 x 10^{3} kg. A square plate of

aluminum that is 1.00 cm thick has a mass of 75.0 gm. What is the
length
of one side

of the square plate in centimeters?

ANSW: 5.27 cm

B) Two square plates of a
certain metal have the same mass. Plate A has a thickness of

0.50 cm while plate B has a thickness of 0.25 cm. What is the ratio of
the length of

one side of plate A to the length of one side of plate B?

ANSW: 0.71

3] You’re worried about your physics exam and pace back and
forth
in your room. You pace

at the rate of one step
per second. First you go right (positive) for 4 steps, then left
(negative)

for 5 steps, then right
for 6 steps, and finally left for 3 steps. Graph this motion and
determine

the average velocity in
steps/sec.

ANSW: 0.1 steps/sec

4] A car starts with an initial velocity of 8.0 m/s and
travels
for 5.0 sec with a uniform

acceleration of +1.5 m/s^{2}
. The driver then applies the brakes, causing a uniform

negative acceleration of
-2.0 m/s^{2 }for 2.5 sec. What is the velocity of the car at
the

end of the braking period?

ANSW: +10.5 m/s

CH 1,2 SAMPLE MULTIPLE CHOICE TYPE
QUESTIONS

1] Suppose that two quantities, A and B, have different
dimensions. Determine which

of the following arithmetic operations could be
physically meaningful.

a) A + B
b) B -
A c) A -
B d) A/B

2] Which of the following expressions is dimensionally
consistent with an expression for

acceleration (units of distance divided by time
squared)? In each case, x is a distance,

t is time, and v is velocity.

a) v /t^{2}
b) v/x^{2}
c) v^{2}
/t d) v^{2}
/x

3] An x versus t graph is drawn for a ball moving in
one direction. The graph starts at the

origin, increases with a positive slope for five
seconds, and then levels off to a zero slope for

2 seconds. We can be sure that

a) the speed is decreasing
during the first 5 seconds

b) the acceleration is constant
throughout the complete motion

c) the speed is zero between t=5
sec and t=7 sec

d) the displacement is zero
throughout the motion

e) more than one of the above is
true

4] A ball is thrown straight up.
For which situation are both the instantaneous velocity and the

acceleration zero?

a) on the way up

b) at the top of the flight
path

c) on the way down

d) none of the above

Answers:

1) d

2) d

3) c

4) d