Transcript H.final.jeopardy

Jeopardy!
get a
move on
can you
graph
that for
me?
going in
circles
do you
have the
energy?
just the
right
momentum
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free
fallin’
don’t
force me
to do it
forces of
nature
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A football starts on the 15-yard
line and is carried to the 25yard line. What position is the
origin?
0
A footbal player runs from the
30-yard line to the 45-yard line
and then back to the 15-yard
line. What is his
displacement?
-15 yards
A car is moving in reverse (to
the left) and the brakes are
being applied to slow it down.
What is the direction of the
car’s acceleration?
Right.
State all of the different ways
that an object can accelerate.
Speed-up, slow-down, change
direction.
A car is moving at 20 m/s and
slows down to 12 m/s with an
acceleration of magnitude 2
m/s2. How far does the car
move while doing so?
14 meters
A basketball and a bowling
ball are dropped from the roof
of a buidling. Ignoring air
drag, which will hit the ground
first?
Neither -- they both hit at the
same time.
A car going 20 m/s drives off
the end of a flat cliff at the
exact same time that a stone
falls from rest from the same
cliff. Which object hits the
ground first?
Neither -- they both hit the
ground at the same time.
A snowmobile moving forward
at a constant 20 m/s shoots a
flare vertically upward in the
sky. Ignoring air drag, where
will the flare land, behind, in
front of, or back inside the
snowmobile?
Back inside
A basketball is thrown up into
the air and returns back to the
ground. What is the
magnitude and direction of its
acceleration at the highest
point of its trip?
-9.8 m/s2
Calculate the maximum height
of a ball thrown into the air
with an initial velocity of +
20m/s.
20 meters.
Which of the following requires a
net force?
(A) a ball rolling down a hill
(B) a hockey puck sliding to a stop
(C) a race car driving in a circle at
a constant speed
All of them.
A train runs into a bicycle.
Which experiences a greater
force -- the bicycle or the
train?
They each experience the
same force.
Correct the following
statement: my dog weighs 20
kg.
My dog has a mass of 20 kg.
An object sits at rest on a
surface where friction cannot
be ignored. Explain how
much force is required to get
the object moving. Be
specific.
The applied force must be greater
than the maximum force of static
friction.
A person is moving a box of
mass 20 kg by applying a
force of 80 N. The force of
kinetic friction is 20 N.
Calculate the acceleration of
the box.
3
2
m/s
“Fancy” word for the direction
of the force and acceleration
in circular motion.
centripetal
What is the direction of the
velocity of the tip of the
second hand on a clock when
it is at the 6 o’clock position?
(left, right, up, down?)
left
A toy airplane is being whirled
in a circle at the end of a
string. If the string breaks, the
plane will fly off in what
direction?
tangent
Calculate the acceleration of a
passenger on a roller coaster
moving at 20 m/s and turning
a corner of radius 10 meters.
40 m/s2
If the Earth were to somehow
move twice as far from the
Sun the force of gravity on the
Earth by the Sun would be
how many times greater or
smaller (state which)?
4 times smaller
What is the scientific word for
the ability to do work?
energy
Calculate the work done by a
weightlifter who lifts 800 N to a
height of 2 meters.
1600 J
A woman carries 20 kg of
water in a jar on her head for
a distance of 2000 meters
across a level road. Calculate
the work done by her on the
jar of water.
0J
Calculate the gravitational
potential energy of a 10-kg
rock at a height of 20 meters.
2000 J
DAILY DOUBLE
A 10-kg rock on the edge of a
cliff has 8000 J of gravitational
potential energy. Calculate
the speed of the rock just
before it hits the ground.
40 m/s
When a bug is hit by the
windshield of a car, which
experiences the greater impulse?
They each experience the same
impulse.
In which case will a falling egg
experience a greater impulse -- if
it lands on a concrete sidewalk or
on a pile of peanut butter?
The impulses are the same.
A 1000-kg car moving at 20 m/s
to the right collides head-on with
a 2000-kg truck moving at 5 m/s
to the left and the two vehicles
become stuck together. After the
collision, the wreckage will move
in what direction?
To the right
A 2500-kg SUV moving at 5 m/s
collides with a 600-kg
motorcycle moving at 50 m/s.
Which vehicle will have a greater
change in velocity?
The motorcycle.
A baseball of mass 0.5 kg heads
toward a bat with a speed of 10
m/s and is hit away from the bat
with a speed of 20 m/s. The ball
was in contact with the bat for
0.01 seconds. Calculate the
average force exerted on the ball
by the bat.
1500 N
What is the displacement of the
object from 1 sec to 2 sec?
- 5 meters
Velocity of the object from 0 sec
to 2 sec.
-5 m/s
Acceleration of the object from 0
sec to 2 sec.
+2.5
2
m/s
Displacement of the object from
2 sec to 3.5 sec.
+4.5 m
DAILY DOUBLE!
During what time interval is the
object at rest?
It is impossible to say for sure.
Calculate the weight of a 20-kg
poodle.
200 N
A worker is pushing a box across
the floor, causing it to move with
a constant velocity. How big is
the worker’s push compared to
the force of friction?
The same size.
Where will it be harder to
accelerate a moon buggy on a
level surface (ignoring the effects
of friction), on the earth or the
moon?
It will be equally difficult at both
locations.
A 20-kg turkey is standing on a
scale (that reads Newtons) in an
elevator that is moving up and
slowing down with an
acceleration of magnitude 2 m/s2.
Calculate the reading on the
scale.
160 N
What is the weight of a 100-kg
astronaut on the surface of a
planet of mass 1 x 1024 kg and
6
radius 1 x 10 meters?
6,671 N