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Forces In Motion - Lesson 1
Test Description: This is covering lesson 1
Instructions: Answer all questions to get your test result.
1) A feather and a rock dropped at the same time from the same height would land at the same time when dropped
A
by Newton in England
B
by Galileo in Italy
C
by an astronaut on the moon
D
by an astronaut on the space shuttle
2) An object is in projectile motion if
A
All of the above
B
it is accelerated downward by gravity
C
it does not accelerate horizontally
D
it is thrown with a horizontal push
3) If three balls of different matrials were dropped at the same time form the same height, which would hit the ground first? (Assume there is no air resistance.)
A
a tennis ball
B
a solid rubber ball
C
They would all hit at the same time
D
a solid steel ball
4) Galileo proved that the rate at which an object falls
A
increases with an increase in mass
B
increases with a decrease in mass
C
is not affected by the mass
D
decreases with an increase in mass
5) All objects accelerate toward the Earth at a rate of 9.8 m/s/s. This means that for every second that an object falls, its downward velocity
A
decreases by 9.8 m/s
B
None of the above
C
stays at 9.8 m/s
D
increases by 9.8 m/s
6) A ball is dropped from a rooftop. What is the ball's velocity after 3 s? (Assume that there is no air resistance)
A
29.4 m/s
B
0 m/s
C
19.6 m/s
D
9.8 m/s
7) Air resistance is
A
sliding friction
B
static friction
C
rolling friction
D
fluid friction
8) The amount of air resistance acting on an object depends on the object's
A
mass and weight
B
density and mass
C
size and shape
D
None of the above
9) Astronauts float inside the space shuttle because they
A
are massless
B
have no gravitational force acting on them
C
are in free fall
D
are weightless
10) An orbit is formed when the shuttle
A
is in free fall
B
is pulled down by gravity
C
Moves forward
D
All of the above
*select an answer for all questions
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