Chapter 15 Review Game Day

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Chapter 15 Review Game Day
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• Becky is trying to push a box across the
  floor. What type of friction is making it hard
  for her to start moving the box?A. Heat
  frictionB. Static FrictionC. Rolling
  FrictionD. Sliding Friction

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• B. Static Friction This is the friction that
  makes it difficult when you start moving
  something (for example, a car or a box!)

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Which tool can you use to measure force?

• Ruler
• Spring scale
• Pan balance
• Electronic Scale

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• B. A spring scale We used this to measure the
  force of the wooden ball at the beginning of this
  unit, as well as to measure the force of the
  washers in the lab last week!

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Four students roll bowling balls across four
surfaces with the same amount of force. Which
ball will most likely travel the furthest?

• The ball rolling on carpet
• The ball rolling on a sandy path
• The ball rolling on grass
• The ball rolling on tile floor

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• D. The ball rolling on tile floor This surface
  is the smoothest, therefore creating the least
  friction.

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Earths gravitational force will have the
greatest affect on a man if

• He is in an airplane.
• He is standing at sea-level.
• He is on top of Mount Everest.
• He is walking on the moon.

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• B. He is standing at sea level The closer a
  person is to the center of the earth, the
  stronger the gravitational force will be on him.

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A baseball player hits the ball with his bat.
Which of the following statements is true about
the force of the baseball hitting the bat?

• The ball hits the bat with an opposite but lesser
  force.
• The ball hits the bat with an opposite and equal
  force.
• The ball hits the bat with an opposite and
  greater force.
• The ball hits the bat with an opposite and double
  force.

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• B. The ball hits the bat with an opposite and
  equal force according to Newtons 3rd Law!

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What is the difference between speed and velocity?

• Speed does not include a time measurement.
• Velocity is the speed of an object measured in 1
  hour.
• Velocity does not include a time measurement.
• Velocity is the speed of an object in a
  particular direction.

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• D. Velocity is the speed in a particular
  direction. Remember our discussion about going
  to Rochester and then coming home? My velocity
  changes because the direction I am traveling in
  changes.

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Imagine that you are pushing on a 15 kilogram box
with 5-N force. Which choice below calculates
the acceleration of the box?

• 5 N/15 kg
• 15 kg/5 N
• 5 N 15 kg
• 15 kg X 5 N

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• A. 5 N/15 kg The formula for finding
  acceleration is
• acceleration force mass

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Look at the graph on the overhead. What is
happening between 3 and 7 seconds?

• Instantaneous speed
• Changing acceleration
• Constant acceleration
• Constant speed

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• Changing acceleration
• The speed is changing, and therefore, the
  acceleration is changing.

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In which of the following would you expect to see
no movement?

• A 5-N force pulling up and a 5-N force pushing
  down.
• A 2-N force pulling up and a 4-N force pushing
  down.
• A 7-N force pushing to the left and a 4-N force
  pushing to the right.
• A 10N force pushing to the left and a 1-N force
  pushing to the right.

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• A. A 5 N force pulling up and a 5 N force
  pulling down. These forces are balanced and that
  means that the object will not move.

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According to Newtons Second Law of Motion, which
object will have the greatest acceleration if all
are thrown with the same amount of force?

• Ping pong ball
• Tennis ball
• Bowling ball
• Softball

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• A ping pong ball.
• Newtons Second Law says that the less mass
  something has, the greater the acceleration will
  be.

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What causes the change in daily tides?

• The Suns gravitational pull on Earth
• Mercurys gravitational pull on Earth
• The Moons gravitational pull on Earth
• Earths gravitational pull on itself

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• C. The moons gravitational pull on the earth.
  This was something we read about in a reading
  assignment during this unit!

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What causes a rock sitting on the ground to
remain in the same place unless a force acts on
it?

• Friction
• Inertia
• Momentum
• Unbalanced forces

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• Inertia
• Inertia is the tendency for an object to remain
  still if it is still or remain in motion if it is
  in motion. The more mass something has, the
  greater its inertia is!

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A runner travels 4 kilometers in 30 minutes.
What is the speed of the runner?

• 1 km/h
• 6 km/h
• 8 km/h
• 80 km/h

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• 8 km/hour
• The runner can travel 4 km in a half an hour.
  There are two half hours in a whole hour, meaning
  the runner can travel twice as far or 8 km in
  that hour.

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What force keeps the Moon from shooting straight
out inter outer space?

• The gravitational pull of the Sun.
• The massive amount of friction in space
• The gravitational pull of Earth
• The tiny amount of friction in space

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• The gravitational pull of the Earth.
• This keeps the moon from floating away the same
  way it keeps us from floating away.

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A pool player hits a ball and this ball hits
another one into the corner pocket. What
happened?

• When the balls collided both balls gained
  momentum.
• The first ball slowed because it gained momentum
  from the cue stick.
• The first ball slowed because it gave some of its
  momentum to the second ball.
• When the balls collided both balls lost momentum.

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• C. The first ball slowed because it gave some of
  its momentum to the second ball. The momentum
  was in a sense transferred to the second ball.

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Short Answer Why can you feel and see the
effect of the Earths gravitational pull on you,
but you cannot feel or see the effect of your
teachers gravitational pull on you?
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• You can feel the gravitational pull of the Earth
  because it is huge!
• However, your teacher is not big enough to feel
  her gravitational pull.

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Short Answer Compare how balanced and
unbalanced forces affect an object at rest.
(What will a balanced force do to the object and
what will an unbalanced force to do the object?)
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• Unbalanced forces cause an object to move in the
  direction of the greater force.
• Balanced forces cause an object to stay at rest.

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Fill in the blanks in the statement below.

• Newtons First Law of Motion states that an
  object at rest remains at _________ and an object
  in motion remains in motion until acted on by an
  unbalanced ________.

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• Newtons First Law of Motion states that an
  object at rest remains at rest and an object in
  motion remains in motion until acted on by an
  unbalanced force.

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Fill in the blanks in the statement below.

• Newtons Second Law states that acceleration of
  an object depends on the ___________ of an object
  and the amount of ___________ applied to the
  object.

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• Newtons Second Law states that acceleration of
  an object depends on the mass of an object and
  the amount of force applied to the object.

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Fill in the blanks in the statement below.

• Newtons Third Law states that when a force is
  applied to an object, the object exerts an equal
  force in the __________ direction.

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• Newtons Third Law states that when a force is
  applied to an object, the object exerts an equal
  force in the opposite direction.

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Answer both parts of this question

• What is the formula for speed?
• What is the speed of a bus going 36 meters in 4
  minutes? Label this correctly!

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• What is the formula for speed?
• Speed Distance/Time
• What is the speed of a bus going 36 meters in 4
  minutes? Label this correctly!
• 36 meters/4 minutes 9 meters/minute

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Answer both parts of the following question

• Which is stronger sliding friction or rolling
  friction?
• How do you know?

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• Which is stronger sliding friction or rolling
  friction?
• Sliding Friction
• How do you know?
• In the lab we did with the car, when we turned it
  upside down and slid it, it slowed the car down.

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• The End
• Are you ready???