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CHAPTER 12 FORCES JEOPARDY
$100
Objects are Lazy
Use the Force
Copy Cats
Even if the Sky is Falling Down Down…
Mixed Bag
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Final Jeopardy
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 - $100
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 BACKWARDSREACTION 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
