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…
$100
$100
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$200
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$300
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$400
$400
$400
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$400
$500
$500
$500
$500
$500
Final Jeopardy
Mixed
Bag
Objects are lazy - $100
According to Newton’s second law of motion, the
acceleration of an object equals the net force
acting on the object divided by the object’s
mass
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

Which universal force acts only on the protons
and neutrons in a nucleus

Strong nuclear
Objects are lazy - $500

What are the four fundamental forces?
Use the force - $100

The SI Unit of force is …….

The Newton
Use the force - $200

When an unbalanced force acts on an object,
the object…..

accelerates!
Use the force - $300

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 - $400

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

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
The weak nuclear force is associated with

Nuclear decay
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
The acceleration due to gravity on the surface of
Mars is about one third the acceleration due to
gravity on Earth’s surface. The weight of a dog on
the surface of Mars is about

1/3 it’s weight on earth’s surface
Even if the sky is falling down down… - $100

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

You won’t fall out of this roller coaster because
of?

Centripetal force
Even if the sky is falling down down… - $300
What is the weakest force?

Gravity
Even if the sky is falling down down… - $400

What is con served when two objects collide in a
closed system?

Momentum
Even if the sky is falling down down… - $500

It usually takes more force to start an object
sliding than it does to keep an object sliding
because static friction is usually
____________________ than sliding friction.

Greater (Larger)
Mixed Bag - $100

What kind of friction occurs as a fish swims
through water?

Fluid friction
Mixed bag- $200
 As
the polar bear slides across the
snow, the sliding friction acting on
the bear …

Acts in the direction opposite of motion.
mixed bag- $300

The forces acting on the falling meatballs are?

Gravity and air resistance
Mixed bag - $400
An open parachute increases air resistance of a
falling sky diver by

Increasing
Mixed bag - $500
Projectile motion is
caused by


the downward force of gravity and an initial
forward velocity.
Final Jeopardy

an orange might roll off your cafeteria tray when
you stop suddenly because of

the orange’s inertia