Category 1
description
Transcript of Category 1
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Category 1
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Category 3
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Category 4
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Category 5
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Category 1 questions follow
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Questio
nIf 2 cars collide after rolling towards each other,
both with the same mass and speed, what is
their combined momentum after they meet?
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Answ
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If 2 cars collide after rolling towards each other,
both with the same mass and speed, what is their
combined momentum after they meet?
Remember m1v1 = m2v2
The resultant momentum = 0
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Questio
nWhat fairly safety method can you use to produce a
higher velocity when shooting a clown out of a cannon?
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Answ
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What fairly safety method can you use to produce a
higher velocity when shooting a clown out of a cannon
FT = mv
Without increasing the force, and the clown having the
same mass, the longer the barrel, the greater the
velocity
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Questio
nYou are in a 200 kg car going 50 km/hr. Which of the
following will produce the least amount of force on
impact?
a. Hitting an immovable brick wall
b. Hitting car head on which is 100 kg moving 200 km/hr
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Answ
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You are in a 200 kg car going 50 km/hr. Which of the
following will produce the least amount of force on
impact? MV= 10 000
a. Hitting an immovable brick wall (same as original)
b. Hitting car head on which is 100 kg moving 200 km/hr
MV = 20 000
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Questio
nCompare the force of a raindrop on the ground that hits
the ground and bounces up to one which simple hits and
lays on the ground. (which has the greatest force?
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Answ
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Compare the force of a raindrop on the ground that hits
the ground and bounces up to one which simple hits
and lays on the ground. (which has the greatest force?
a. A drop of water that bounces up indicates that it has
more momentum than one which simply fell.
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Questio
nIf you are on a frictionless boat on a lake with no
friction, what would move you to the right edge the
fastest?
a. Blow in and out in one direction
b. Throwing a 2 kg boot to the right
c. Throw a 1 kg baseball to the left
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Answ
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If you are on a frictionless boat on a lake with no
friction, what would move you to the right edge the
fastest?
a. Blow in and out in one direction
b. Throwing a 2 kg boot to the right
c. Throw a 1 kg baseball to the left- (for every action
there is an opposite and equal reaction)
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Category 2 questions follow
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Questio
nAn astronaut is floating in space and needs to get back to the ship. He
throws a wrench is the direction opposite of where he wants to go. He
will move___
a. Away from the ship at the same velocity as the wrench is moving
b. Toward the ship at the same velocity as the wrench is moving
c. Toward the ship at a slower velocity than the wrench is moving
d. Toward the ship at a faster velocity than the wrench is moving
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Answ
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An astronaut is floating in space and needs to get back to the ship.
He throws a wrench is the direction opposite of where he wants to
go. He will move___
a. Away from the ship at the same velocity as the wrench is moving
b. Toward the ship at the same velocity as the wrench is moving
c. Toward the ship at a slower velocity than the wrench is moving
** opposite and equal (mv = mv)
d. Toward the ship at a faster velocity than the wrench is moving
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Questio
nA bike is traveling with a constant speed down hill at
the same rate as a bus which has 10 times its mass.
a. They have the same momentum
b. They have the same force of impact if the hit a wall
at the bottom
c. They both have zero acceleration
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Answ
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A bike is traveling with a constant speed down hill at
the same rate as a bus which has 10 times its mass.
a. They have the same momentum
b. They have the same force of impact if the hit a wall
at the bottom
c. They both have zero acceleration
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Questio
nDescribe how these factors affect the amount of force
that a ball hits the ground with
a. Its speed on impact
b. The length of impact with the ground (did it hit
concrete or dirt)
c. If it bounced
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Answ
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Describe how these factors affect the amount of force
that a ball hits the ground with
a. Its speed on impact- higher speed = more force
b. The length of impact with the ground (did it hit
concrete or dirt)- the longer the impact, the less
the force
c. If it bounced- bouncing indicates more force than
laying still
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Questio
nWhat do the following have in common?
a. Children wear helmets when riding bikes
b. Play ground equipment have rubber mats
underneath
c. Jumping with your knees bent
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Answ
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What do the following have in common?
a. Children wear helmets when riding bikes
b. Play ground equipment have rubber mats underneath
c. Jumping with your knees bent
They all decrease force by increasing the time of impact
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Questio
nWhat is the reaction force to the following action forces?
a. Tires on the road
b. Rocket exhaust
c. Walking on the floor
d. The pull of the earth on you-
e. The boxer hits a bag
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Answ
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What is the reaction force to the following action forces?
EQUAL AND OPPOSITE FORCES
a. Tires on the road- road pushing up against tire
b. Rocket exhaust- rocket moves forward
c. Walking on the floor- floor pushes up on feet
d. The pull of the earth on you- the pull of you on the earth
e. The boxer hits a bag- the bag hits the glove
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Category 3 questions follow
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Questio
nA car with a momentum of 40 kg m/s and a mass of20
meters will have a speed of __________
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Answ
er
A car with a momentum of 40 kg m/s and a mass of20
meters will have a speed of __________
P = mv or momentum = mass (velocity)
So
40 kgm/s = 20 kg (v)
10 m/s = V
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Questio
nZero acceleration occurs when an object is
a. At constant velocity
b. In mechanical equilibrium
c. At rest
d. At terminal velocity
e. All of these
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Answ
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Zero acceleration occurs when an object is
a. At constant velocity
b. In mechanical equilibrium
c. At rest
d. At terminal velocity
e. All of these
Acceleration occurs only when there is a change in speed
or direction
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Questio
nYour Weight
a. Is dependent on ___________
a. Is a unit of _______________ called Newtons
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Answ
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Your Weight
a. Is dependent on _the grativational attraction on you
a. Is a unit of _force___ called Newtons
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Questio
nThe force on a sky diver is dependent on
a. Size of person
b. Speed of object
c. Both of these
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Answ
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The force on a sky diver is dependent on
a. Size of person
b. Speed of object
c. Both of these
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Questio
nAn object that has a mass of 50 kg has a weight of
a. About 500 N
b. About 5 N
c. About 50 kg
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Answ
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An object that has a mass of 50 kg has a weight of
a. About 500 N
b. About 5 N
c. About 50 kg
d. W = mg so Wt = 50 kg (10 m/s2) = 500 N
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Category 4 questions follow
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Questio
nA force of 50 N is needed to move a box at 10 m/s.
What is its mass?
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Answ
er
A force of 50 N is needed to move a box at 10
m/s. What is its mass?
F = ma
50 N = 50 kg m/s2
50 kg m/s2 = m (10m/s2)
5 kg
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Questio
nThe bug which hits the windshield always exerts
a. Less force than the windshield
b. More force than the windshield
c. The same force than the windshield
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Answ
er
The bug which hits the windshield always exerts
a. Less force than the windshield
b. More force than the windshield
c. The same force than the windshield
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Questio
nA train with 2 cars runs head on into a train with only 1
car, with all the cars having the same mass
a. Which has a greater change in momentum?
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Answ
er
A train with 2 cars runs head on into a train with only 1
car, with all the cars having the same mass
a. Which has a greater change in momentum?
b. The train with only 1 car changes momentum faster
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Questio
nA train with 2 cars runs head on into a train with only 1
car, with all the cars having the same mass
a. Which hit with the most force?
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Answ
er
A train with 2 cars runs head on into a train with only 1
car, with all the cars having the same mass
a. Which hit with the most force?
Remember- For every reaction there is an opposite but
equal reaction- they hit with the same force
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Questio
nWhy would a small gun firing a large bullet be a hazard?
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Answ
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Why would a small gun firing a large bullet be a hazard?
Because there may be more force going backward than
forward
M1v1 = m2v2
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Category 5 questions follow
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Questio
nCompare a 1 kg mass moving 10 m/s to a 2 kg mass
traveling at the same speed.
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Answ
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Compare a 1 kg mass moving 10 m/s to a 2 kg mass
traveling at the same speed.
If you double the mass, the momentum is doubled
(directly proportional)
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Questio
nWeight
a. Is A gravitational attraction
b. Is Measured in kilograms
c. Never changes
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Answ
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Weight
a. Is A gravitational attraction
b. Is Measured in kilograms
c. Never changes
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Questio
nIf you are on a planet which has 3 times the mass as
earth, your mass would be
a. 1/3 as large
b. 3 times as large
c. The same
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Answ
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If you are on a planet which has 3 times the mass as
earth, your mass would be
a. 1/3 as large
b. 3 times as large
c. The same- mass does not change
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Questio
nIf you are on a planet which has 3 times the mass as
earth, your weight would be
a. 1/3 as large
b. 3 times as large
c. The same
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Answ
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If you are on a planet which has 3 times the mass
as earth, your weight would be
a. 1/3 as large
b. 3 times as large
c. The same
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Questio
nCompare the amount of friction force on a motorcycle
with 2 wheels versus a small car with 4 wheels, if the
masses are the same.
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Answ
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Compare the amount of friction force on a motorcycle
with 2 wheels versus a small car with 4 wheels, if the
masses are the same.The total amount of force downward is the same, each tire on the motor cycle would have less surface area, but would have more mass/weight pushing downward.
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