Transcript 33333.3 N How much force is needed to keep a 1000 g ball moving

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Final Jeopardy
Centripetal/
Vocabulary Centrifugal forces
gravity
friction
Newton’s Laws
10 Point
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20 Points
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This is the highest speed reached by a falling
object – this occurs when the weight of the
falling object is balanced out by the air
resistance.
Terminal Velocity
This is the force pulling down
on an object due to the force
of gravity
Weight
This is he sum total of all
forces acting on an object
Net Force
The resistance to a change in
motion
inertia
The force exerted on a
moving object in a direction
up and perpendicular to the
motion of the object
Normal force
This is the force that you “feel”
when riding “The Whip” at
Idlewild that seems to push you
out against the seat.
Centrifugal force
What is the amount of centripetal
force needed to keep a 10 Kg ball
spinning in a circle of radius 1 m
at a velocity of 10 m/s?
1000 N
What amount of force is needed to
keep a 1000 Kg car moving at a
velocity of 20 m/s around a turn of
radius 12 m?
33,333.3 N
How much force is needed to keep a
1000 g ball moving at a velocity of
10 m/s around a circle of diameter
20 cm?
10,000 N
What is the maximum speed a ball
on a string can be travelling if the
ball has a mass of 8 Kg and the
force needed to break the string is
150 N when the ball is spinning
around a radius of 0.8 m?
3.16 m/s
What are the 2 factors that affect
the amount of gravitational
attraction between 2 objects?
The masses of the objects & the
distance between them
If the gravitational force between
two objects is F and the mass of one
of the objects is doubled with
everything else kept the same; then
in terms of F, what is the new
gravitational force between the
objects?
2F
If the gravitational force between
two objects is F and the mass of
both of the objects is doubled with
everything else kept the same; then
in terms of F, what is the new
gravitational force between the
objects?
4F
If the gravitational force between
two objects is F and the mass of
both of the objects is doubled as
well as the distance between them,
then in terms of F, what is the new
gravitational force between the
objects?
F
What is the acceleration of gravity
on the moon if the mass of the moon
is 1/6th that of the Earth?
1.6
2
m/s
What type of friction exists
when rubbing your hands
together?
Sliding friction
What is the greater, static
friction of rolling friction?
Static friction
What is the coefficient of friction
for a 50 N cup slid across a table
that has 20 N of friction?
0.4
If the coefficient of static friction
between a desk & the floor is 0.3
with a Normal force of 200 N, what
is the force of static friction needed
to overcome to get the object to
move?
60 N
A 10 Kg box requires how many N
of force to start sliding it across the
floor in which the coefficient of
friction is 0.25? (Assume gravity =
10 m/s2)
25 N
This is Newton’s Law that explains
the action/reaction nature of
forces.
rd
3
Law
This is the law that explains why,
when riding a skateboard, if you hit
a pebble stopping the board, you
continue to move forward.
st
1
Law
According to Newton’s 2nd Law,
objects will do this as a result of an
unbalanced force?
ACCELERATE
According to Newton’s 2nd Law,
100 N of force would cause a 10 Kg
object to accelerate at a rate of
____?
10
2
m/s
You are launching a bottle rocket
of mass 2.5 Kg using 65 N of
thrust. If there is 12 N of air
resistance acting against it, what is
the rate of acceleration of the
bottle rocket?
11.4
2
m/s
Make your wager
To 3 decimal places, what is the coefficient of
friction in the diagram below?
0.383