Transcript Jeopardy

Physics Jeopardy
Free Body
Diagrams
1st law
2nd law
3nd law
Mix Up
Q $100
Q $100
Q $100
Q $100
Q $100
Q $200
Q $200
Q $200
Q $200
Q $200
Q $300
Q $300
Q $300
Q $300
Q $300
Q $400
Q $400
Q $400
Q $400
Q $400
Q $500
Q $500
Q $500
Q $500
Q $500
Final Jeopardy
$100 Free Body Diagrams
Draw the net force acting on a box if the box is
traveling at a constant velocity.
$100 Answer Free Body
Diagrams
$200 Free Body Diagrams
What is the net force on a 18 kg cat if it is falling out of
a tree?
$200 Answer Free Body
Diagrams
Fg = 180 N
(This is a very fat
cat)
$300 Free Body Diagrams
What is the net force acting on a 40 kg box that is
being pulled from the right with a force of 70 N and
there is a frictional force of 20 N.
$300 Answer Free Body
Diagrams
FN = 400 N
Ff = 20 N
Fp = 70 N
Fnet = 50 N right
Fg = 400 N
$400 Free Body Diagrams
What is the acceleration on a 15 kg box that was
sliding on ice at a constant velocity when it hits a patch
of concrete that will provide a frictional force of 40 N?
$400 Answer Free Body
Diagrams
150 N
40 N
Fnet = -40 N
Therefore,
acceleration = -2.67 m/s^2
150 N
$500 Free Body Diagrams
What is the frictional force between a box sliding down a hill
with an incline of 50 degrees if it has a constant velocity and the
box is 12 kg?
$500 Answer Free Body
Diagrams
FN = 77.1 N
Ff = 91.9 N
12 kg
Fll = 91.9 N
F = 77.1 N
50o
Fg = 120 N
$100 Question
st
1
law
Inertia is that property of matter that does
what to a change in motion?
$100 Answer
st
1
law
Opposes a change in motion
$200 Question
st
1
law
The law of inertia states that an object_________.
a) At rest will remain at rest unless acted on by an outside force.
b) Will continue moving at the same velocity unless an outside
force acts on it.
c) Will continue moving in a straight line unless an outside force
acts on it.
d) That is not moving will never move unless a force acts on it.
e) All of the above
f) None of the above
$200 Answer
st
1
law
e) All of the above
$300 Question
st
1
law
When you bring an object with a certain
amount of inertia from Earth to the Moon
(which has less gravity), does it’s inertia
increase or decrease?
$300 Answer
st
1
Stays the same
law
$400 Question
st
1
law
On the surface of Jupiter, the
acceleration due to gravity is about 3
times that of Earth. What would be
the mass of a 120 kg rock on Jupiter?
$400 Answer
M = 120 kg
st
1
law
$500 Question
st
1
law
What is the resultant of a 5.0 N force acting
vertically upward and a 3.0 N force acting
horizontally?
$500 Answer
F = 5.8 N
st
1
law
$100 Question
nd
2
law
A person weighs 500 N. What is the
mass of the person?
$100 Answer
nd
2
m = 50 kg
law
$200 Question
nd
2
law
A rock is thrown vertically into the
air. At the very top of its
trajectory the net force on it is
_________.
a) Less than its weight
b) More than its weight
c) Its weight
$200 Answer
c) Its weight
nd
2
law
$300 Question
nd
2
law
You push with 20 N on a 10 kg
block on a frictionless surface.
How fast will the block
accelerate?
$300 Answer
a = 2 m/s^2
nd
2
law
$400 Question
nd
2
law
Suppose a cart is being moved by a force. If
suddenly a load is dumped into the cart so that
the cart’s mass doubles, what happens to the
cart’s acceleration?
a) It quadruples
b) It doubles
c) It halves
d) It quarters
e) It stays the same
$400 Answer
c) It halves
nd
2
law
$500 Question
nd
2
law
You push with 60 N on a 10 kg
block and there is a .3
coefficient of friction. How fast
will the block accelerate?
$500 Answer
nd
2
a) = 3 m/s2
law
$100 Question 3rd Law
Forces always occur ____________.
a) By themselves
b) As single quantities
c) In pairs
d) In triplets
$100 Answer 3rd Law
C) In pairs
$200 Question 3rd Law
An unfortunate bug splatters against the
windshield of a moving car. Compared to
the force of the car on the bug, the force on
the bug on the car is ________.
a) Larger
b) Smaller
c) The same
d) Need more information.
$200 Answer 3rd Law
c) The same
$300 Question 3rd Law
Two people pull on a rope in a tug of war. Each
pulls with 400N of force. What is the tension in
the rope?
$300 Answer 3rd Law
400 N
$400 Question 3rd Law
Apply Newton’s third law to a falling boulder,
identifying the action and reaction forces. If a force is
exerted on Earth, why doesn’t it move?
$400 Answer 3rd Law
Even though the force exerted on the boulder and earth are
the same, since the boulder has a much smaller mass than
earth, it will accelerate much much more. Therefore it
moves much more. The earth is so massive that the affects
of the boulder moving it are negligible.
$500 Question 3rd Law
If every force is paired with an equal and opposite force,
explain why a cannon firing a cannon ball works.
$500 Answer 3rd Law
Even though there are equal and opposite
forces, they are on different objects
making the net force on either object
something other than zero. With a net
force, they can accelerate.
$100 Question Mix Up
Accelerations are produced by __________.
a) Velocities
b) Accelerations
c) Forces
d) Masses
e) None of the above
$100 Answer Mix Up
c) forces
$200 Question Mix Up
Suppose a particle is accelerated through space by a constant
10 N force. Suddenly the particle encounters a second
force of 10 N in a direction opposite to that of the first
force. The particle _________.
a) Is brought to a rapid halt
b) Gradually decelerates to a halt
c) Continues at the speed it had when it encountered the
second force
d) Theoretically accelerates to speeds approaching the speed
of light
e) None of the above
$200 Answer Mix Up
c) Continues at the speed it had
when it encountered the second
force.
$300 Question Mix Up
How fast will a ball be falling if you throw it
downward at a velocity of 8 m/s and it falls
for 4 seconds?
$300 Answer Mix Up
v = -48 m/s
$400 Question Mix Up
How long does it take for a rock to fall a distance of
75 meters?
$400 Answer Mix Up
t = 3.87 s
$500 Question Mix Up
If you apply a forward force to a 1200 kg car of
600 N and there is a frictional force of 70 N,
how fast will the car be going after 5 seconds if
you start pushing it from rest?
$500 Answer Mix Up
v = 2.2 m/s
Final Jeopardy
Is a 20 kg box at equilibrium if it is sliding down a hill with an
incline of 20 degrees and there is a coefficient of friction
between the box and the hill of .364?
Final Jeopardy Answer
Yes