Transcript To review for tomorrow’s quiz, play this review game. Use

To review for
tomorrow’s quiz, play
this review game. Use
your checklist as you
play!
Ch.2-1 Gravity and Motion

To play:
◦ Read the question slide.
◦ Wait until everyone in your group has an answer
written down.
◦ Click the powerpoint to the next slide and reveal
the answer.
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correct answer on your worksheet quickly!
Instructions

Define terminal velocity
Question 1: Terminal Velocity
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Terminal velocity is the constant velocity
of an object when only the force of gravity
is acting on the object.
Answer 1: Terminal Velocity

If you drop an apple and a feather off of a
cliff, and there is no air resistance, which
will hit the ground first?
Question 2: Gravity
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They will both land at the same time.
Answer 2: Gravity
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Define Free Fall.
Question 3: Free Fall
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The motion of an object when only the
force of gravity is acting on it.
Answer 3: Free Fall
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Are monkey’s weightless in space?
Question 4: Weightless
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No, nothing can be weightless. Anything
that has mass has weight.
Answer 4: Weightless
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Define centripetal force.
Question 5: Centripetal Force
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The unbalanced force that causes objects
to move in a circular path.
Answer 5: Centripetal Force
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What is the average acceleration of a
falling object?
Question 6: Acceleration
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9.8 m/s/s
Answer 6: Acceleration
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What three characteristics affect the
amount of air resistance acting on an
object?
Question 7: Air Resistance
Size of the object
 Shape of the object
 Speed of the object
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Answer 7: Air Resistance
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Define orbit.
Question 8: Orbit
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The path of one object around another in
space.
Answer 8: Orbit

A volleyball rolls off of a table and hits the
ground after 3.5 seconds. What is the
volleyball’s velocity when it hits the
ground?
Question 9: Change in Velocity
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Δv= g(t)
Δv = x
g = 9.8 m/s/s
t= 3.5 s
X= 9.8(3.5)
X= 34.3 m/s Down
Answer 9: Change in Velocity
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Define air resistance.
Question 10: Air Resistance
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The force that opposes the motion of
objects through the air.
Answer 10: Air Resistance

A bouncy ball falls out of a toy box and
hits the floor after 0.75 seconds. What
was the velocity of the ball as it hit the
ground?
Question 11: Change in Velocity
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Δv= g(t)
Δv = x
g = 9.8 m/s/s
t= 0.75 s
X= 9.8(0.75)
X= 7.35 m/s Down
Answer 11: Change in Velocity
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What does the “g” stand for in the
formula Δv=g(t)?
Question 12: Acceleration
Acceleration Due to Gravity
 9.8 m/s/s

Answer 12: Acceleration
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Which object accelerates more quickly
when dropped?
◦ Acorn
◦ Marble
◦ Laptop
Question 13: Falling Objects
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They all accelerate at the same rate,
9.8m/s/s.
Answer 13: Falling Objects
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A leaf falls off of a tree. The leaf hits the
ground at a velocity of 17.6 m/s. How
long did it take the leaf to fall?
Question 14: Change in Velocity

T= Δv
g
Δv = 17.6 m/m
g = 9.8 m/s/s
t= x
X= 17.6
9.8
X= 1.8 s
Answer 14: Change in Velocity

What two forces act on all falling objects?
Question 15: Gravity and Motion
Air resistance
 Gravity
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Answer 15: Gravity and Motion
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What characteristics cause a parachute to
fall slowly.
Question 16: Gravity and Motion
A uniform shape (all sides are equal)
 Even strings along all sides of the
parachute
 Minimal holes on the sides
 A more rounded shape that catches the
air inside it (not a completely flat
parachute)
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Answer 16: Gravity and Motion