Transcript Ch 12 Forces Jeopardy Final

CHAPTER 12 FORCES JEOPARDY
Objects are
Lazy
Use the
Force
Copy
Cats
Even if the
Sky is
Falling
Down Down…
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$500
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Final Jeopardy
Mixed
Bag
Objects are lazy - $100
A ball rolling across the floor that eventually slows
down illustrates this law AND why?
1st law objects in motion stay in motion unless
acted upon by an unbalanced force (friction from
floor)
Objects are lazy - $200
An airbag is a safety feature that provides an
__________ ________ force that prevents
passengers from projecting through the
windshield.

Unbalanced backwards force
Objects are lazy - $300

What does Newton’s First Law tell us about the
direction of the object’s motion when not acted
on by an unbalanced force?

Objects will continue to stay at rest/stay in
motion when forces are balanced
Objects are lazy - $400

When a sky diver has reached terminal velocity,
why do they continue to move down towards
the ground if the forces are balanced?

1st law in motion when stopped accelerating
so stay in motion because forces are balanced
Objects are lazy - $500
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A person wearing a cast becomes more tired
than usual by the end of the day. Explain this
on the basis of Newton’s first law of motion.
More mass more inertia!
Use the force - $100

The net force needed to accelerate a 1,357 kg car
forward at 8.0 m/s2 is…

10,856 N F=1,357 (kg) x 8 (m/s2)
Use the force - $200

Which of the following will result in the greatest
acceleration: 62 N acting on a 3-kg box or 75 N
acting on a 1-kg box ?
WHY?

75 N acting on 1-kg box because with less mass
and more force  greater acceleration!
Use the force - $300

Using the relationship stated in Newton’s second law of
motion, explain why a Hummer (large vehicle) gets less
gas mileage than a Mini-Cooper (small vehicle) from the
same quantity of gas when both cars have the same
acceleration.

Hummer (large mass) requires more force to
have more acceleration uses more fuel
Use the force - $400
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A 2.5 kg box is sliding along a level floor. It is
slowing down at a rate of 0.45 m/s2. What is the
force of friction the floor is exerting on the box?
1.125 N
F=ma F= 2.5 (kg) x 0.45 (m/s2)

Use the force - $500

Rewrite Newton’s second law of motion
substituting a, acceleration, with the information
from the acceleration equation. Explain why this
makes sense!

F= m x (Vf-Vi)
Tf-Ti
Copy cats - $100
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If two objects with different masses and
traveling with different velocities collide, what
“law” allows you to predict the motion of the
objects after the collision?

Law of conservation of momentum
Copy cats - $200

Calculate the momentum of a pencil sitting on
your desk. Explain how you arrived at your
answer.

Zero! P=mv P= m X 0
P=0 kg × m/s2
Copy cats - $300
Which statement about action-reaction force pairs
is incorrect? WHY ARE THE OTHERS CORRECT?
a.They act on the same object.
b.They occur at the same time.
c.They always occur in pairs.
d.They are equal and opposite.

INCORRECT= A THEY DO NOT ACT ON THE
SAME OBJECT (HENCE = AND OPPOSITE)
 Correct: B—as one force is applied (A) the (R)
occurs
C—A & R
D—equal and
opposite A & R forces
Copy cats - $400
 Identify the Action force and Reaction force.
ACTION FORCE—BALLOON PUSING AIR BACKWARDS
REACTION FORCE—AIR PUSHING BALLOON FORWARDS
Copy cats - $500
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A man is standing on a log that is floating in a
river. He jumps forward off the log and into the
water. Describe the motion of the log.
Even if the sky is falling down down… - $100
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HOW DO WE CALCULATE THE WEIGHT OF AN
OBJECT?
+ 50 FOR THE GRAVITATIONAL CONSTANT

W= MASS X GRAVITY
9.8 M/S2
Even if the sky is falling down down… - $200
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THE GRAVITATIONAL FORCE BETWEEN 2
OBJECTS DEPENDS ON THESE 2
CHRACERISTICS. INVERSE OR DIRECT
RELATIONSHIP FOR EACH?
MASS—DIRECT
 DISTANCE--INVERSE

Even if the sky is falling down down… - $300
The curved path that an object follows when thrown,
launched, or otherwise projected near the surface of
Earth is called…

PROJECTILE MOTION
Even if the sky is falling down down… - $400

A tube of air contains a feather and a coin. Both
objects are dropped at the same time. The coin
falls faster than the feather. However, when the
air is removed from the tube to create a
vacuum, both the feather and the coin reach the
bottom at the same time. Explain why this
happens.
Even if the sky is falling down down… - $500
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The law of universal gravitation, when applied
on Earth, tells us that the force of Earth’s
attraction on an object decreases as the object’s
distance from Earth’s center increases. Use this
law to explain what happens to the weight of an
object as it moves from sea level to the top of a
high mountain.

THEY BOTH WOULD FALL AT THE SAME RATE
Mixed Bag - $100
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What does the TF in TF Green Airport stand for?

Theodore Francis: former RI governor and
longtime senator
Mixed bag- $200
 In
the same way that humans are
identified by their fingerprints,
dogs are identified by what kind
of prints?

Nose prints
mixed bag- $300
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What is a group of crows called?

A murder
Mixed bag - $400
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What president is on the $50 dollar bill?

Ulysses S Grant
Mixed bag - $500
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When is the first day of spring (vernal equinox)?
 +100 What does equinox mean?

March 20th
 Equal day/night
Final Jeopardy
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