# Forces In Motion - Lesson 1: Question Preview (ID: 22770)

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A feather and a rock dropped at the same time from the same height would land at the same time when dropped
a) by Galileo in Italy
b) by Newton in England
c) by an astronaut on the moon
d) by an astronaut on the space shuttle

An object is in projectile motion if
a) it is thrown with a horizontal push
b) it is accelerated downward by gravity
c) it does not accelerate horizontally
d) All of the above

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) a solid steel ball
d) They would all hit at the same time

Galileo proved that the rate at which an object falls
a) increases with an increase in mass
b) decreases with an increase in mass
c) is not affected by the mass
d) increases with a decrease in mass

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) increases by 9.8 m/s
b) decreases by 9.8 m/s
c) stays at 9.8 m/s
d) None of the above

A ball is dropped from a rooftop. What is the ball's velocity after 3 s? (Assume that there is no air resistance)
a) 0 m/s
b) 9.8 m/s
c) 19.6 m/s
d) 29.4 m/s

Air resistance is
a) sliding friction
b) rolling friction
c) fluid friction
d) static friction

The amount of air resistance acting on an object depends on the object's
a) size and shape
b) mass and weight
c) density and mass
d) None of the above

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

An orbit is formed when the shuttle
a) Moves forward
b) is in free fall
c) is pulled down by gravity
d) All of the above

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