Transcript Jeopardy Review Game

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Force and Motion
Forces
Newton
Free Body
Diagrams
Friction
100
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200
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500
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Force
100
Describe the two types of forces and give
an example.
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Contact Force
-push
-pull
Force
100 A
Field Force
-gravity
-electrical
-magnetic
Contact Forces
Frictional Force = Ffrict
Tensional Force = Ftens
Normal Force = Fnorm
Air Resistance Force = Fair
Applied Force = Fapp
Spring Force= Fspring
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Force
200
The fundamental units of Force
Answer
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Force
200 A
N = kg x m/s2
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Force
300
Analyze the following scenario and give the
forces involved: A car being pulled by a
towing cable.
Answer
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Force
300A
-Gravity
-Normal
-Friction
-Applied (pull)
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Solve for the
components of the net
force on a 5 kg balloon
moving upward at 2.0
m/s2 at 25o.
Force
400
Answer
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Forces
400A
Answer
Fx = ma(cosθ) = 9.1N
Fy = ma(sinθ) = 4.2 N
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Force
500
Find the net force of the following diagram.
Answer
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Force
500A
20.6 N at 14.00 South of East
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Newton
100
Explain the cause of acceleration.
Provide the law that explains this
principle.
Answer
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Newton
100A
Force
Newton’s Second Law F=ma.
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Newton
200
The term Newton uses in his first law to
explain an objects tendency to maintain
its state of motion.
Answer
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Newton
200A
Inertia
An object at rest stays in rest, an object in
motion stays in motion, unless acted on
by an unbalanced force.
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Newton
300
A hammer drives a nail into a piece of wood.
Identify the action-reaction pair in this
situation. Which of Newton’s laws explains
this situation?
Answer
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Newton
300 A
The hammer exerts a force on the nail:
the wood exerts a force on the wood.
Newton’s 3rd Law
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Newton
400
As a basketball player starts to jump for a
rebound, the player begins to move upward
faster and faster until his shoes leave the
floor. Describe the force of the floor on the
shoes in relation to Fg at the moment the
player begins to jump.
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Newton
400A
Is greater than the player’s weight
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Newton
500
A 1856 kg truck is moving to the right at a
constant speed of 2.17 m/s2 . What is the
net force on the car? What would it be if it
were to move in the opposite direction.
Answer
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Newton
500 A
Zero, at constant velocity the acceleration is
zero. Therefore, the net force is zero
regardless of the direction.
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Free Body Diagrams
100
Describe three things that are
represented in a free-body diagram.
Answer
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Free Body Diagrams
100A
-the object
-forces as vectors (magnitude and direction)
-forces exerted on the object
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Free Body Diagrams
200
Create a diagram of a book is at rest on
a table top.
Answer
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Free Body Diagrams
200A
In this
diagram, there
are normal and
gravitational
forces on the
book.
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Free Body Diagrams
300
A flying squirrel is gliding (no wing flaps)
from a tree to the ground at constant
velocity. Consider air resistance. A free
body diagram for this situation looks
like…
Answer
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Free Body Diagrams
300A
Gravity pulls
down on the
squirrel while air
resistance keeps
the squirrel in the
air for a while.
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Free Body Diagrams
400
Create a diagram for a car
that runs out of gas and is
coasting down a hill.
Answer
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Free Body Diagrams
400A
Even though the
car is coasting
down the hill, there
is still the dragging
friction of the road
(left pointing
arrow) as well as
gravity and normal
forces.
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Free Body Diagrams
500
A box is pulled across a
surface at an angle, the box
only moves in the x
direction. Write the
equations for the sum of the
forces in the x and y
directions in terms of the
variables in the picture.
Answer
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Free Body Diagrams
500A
Fx =Ftcosθ-Ff = ma
Fy = Fn+Ftsinθ-Fg = 0 (no
movement)
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Friction 100
Compare Kinetic and Static friction.
Answer
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Kinetic friction is the
frictional force of an
object in motion.
Static friction is the
frictional force that
keeps an object
from moving, the
minimum amount of
force that must be
applied for an object
to have motion.
Friction
100A
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Friction
200
What is the unit of the coefficient of
friction?
Answer
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Friction
200A
μ does not have a unit because it
is a ratio of the Force of friction
and the normal force.
Therefore, the units cancel out.
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Friction
300
What happens to air
resistance when an
object accelerates?
Why is it considered
a form of friction? Answer
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Friction
300 A
In most cases, air resistance
increases with increasing
speed. Therefore, friction is a
retarding force so it can be
classified as friction because it
is opposing or slowing down
the motion.
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Friction
400
There are six books in a
stack, each book weighs
5N. The coefficient of
static friction between the
books is 0.2. Determine
what the horizontal force
must be to begin sliding
the top five books off the
bottom one.
Answer
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Friction
400A
Fx = Fapp-Fs = 0
Fapp=Fs=μFn
Fn = Fg
Fg = 5 x 5N = 25N
Fapp = (0.2) 25N = 5 N
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Friction
500
An ice skater moving
at 10.0 m/s coasts to
a halt in 1.0 x 102 m
on a smooth ice
surface. What is the
coefficient of friction
between the ice and
the skates?
Answer
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(1) Fx = Ff = ma
(2) Fy = 0, Fn = Fg
Friction
500A
(3) Ff = μFn = μFg Fg = mg
Ff = μmg = ma
Eq (1) and (3) combined
μmg = ma
m cancels out
μg = a….so… μ = a/g
Solve for a….a = -(vi)2/2∆x = - 0.50 m/s2
μ = a/g = 0.50/9.81 = 0.051
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