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Fall Review 4
Test Description: Conceptual Physics Fall Review 4
Instructions: Answer all questions to get your test result.
1) A race car traveling at 50 m/s applies its brakes and comes to a complete stop in 5.0 seconds. what is the car’s acceleration?
A
-10 m/s2
B
0 m/s2
C
250 m/s2
D
9.8 m/s2
2) The earth __________around the sun and __________around its axis.
A
rotates, revolves
B
both of these
C
none of these
D
revolves, rotates
3) What is a centripetal force?
A
a linear force
B
a nonexistent force
C
an inward force.
D
an outward force
4) As the rotational speed of an object increases its linear speed
A
increases
B
linear speed and rotational speed are the same thing
C
stays the same
D
decrease
5) If you whirl a tin can on the end of a string and the string suddenly breaks the can will fly____________.
A
tangent to its circular path
B
directly toward you
C
directly away from you
D
it will continue in a circular path
6) A ball is left in the cabin of an airplane. When the plane accelerates forward, the ball rolls to the back of the cabin. What happens when the plane stops?
A
The ball's inertia keeps it against the back.
B
It is thrown harder against the back.
C
The ball is not affected by the stop (deceleration).
D
It rolls to the front of the cabin.
7) If a person has a mass of 20 kg, what is there weight in Newtons and pounds on Earth? (g= 10 m/s2 and 1 kg = 2.2 lbs.)
A
200 N and 9.1 lbs.
B
100 N and 9.1 lbs.
C
10 N and 44 lbs.
D
200 N and 44 lbs.
8) There are ________ centimeters in 2.5 meters?
A
250 cm
B
.025 cm
C
.0025 cm
D
25 cm
9) A tire on a car has a radius of .9 m and rotates at an angular speed of 60 rad/s. How fast is the car traveling?
A
54 m/s
B
85.7 m/s
C
54 radians
D
85.7 radians
10) A ball is thrown straight down at a speed of 3.0 m/sec and accelerates under the pull of gravity for 2.0 seconds. How fast is it moving? (v=v0+at; x=v0t+1/2at2)
A
6 m/s
B
23 m/s
C
6 m
D
18 m/s
*select an answer for all questions
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