Transcript Newton`s Laws Gravity & Falling Objects Energy, Work

Motion
Forces/
Newton’s
Laws
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Gravity &
Falling
Objects
Energy, Work,
& Power
Forces in
Action
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Velocity is speed with direction.
Which of the following is a
VELOCITY unit?
a. 50 m/sec
b. 50 m/sec South
c. 50 m/sec2
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Acceleration is expressed in m/sec2.
Which of the following is a
unit is acceleration expressed
in ?
a. 200 m/sec
b.
200 m/sec North
c. 200 m/sec/sec or m/sec2
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50 miles/hr
What is the speed of a car that
goes 100 miles in 2 hours?
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Which of the following
does not need a net force?
A.Positive acceleration
B.Negative acceleration
C.Maintaining constant
speed
D.Changing direction
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Zero acceleration
On a speed/time graph, if the
line is horizontal, what kind
of acceleration is that?
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C. Resistance to change motion
What is inertia?
a.A push or a pull
b.Mass in motion
c.Object’s resistance to change motion
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An object resists change in motion – an object in
motion will stay on motion or an object at rest will stay
at rest unless acted upon by an outside force.
What does Newton’s First
Law of Motion state?
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Give an example of one of
Newton’s Laws of Motion.
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The acceleration of an object is directly related to the
force on the object and indirectly related to its mass
F = m*a
Sum up what Newton’s
Second Law of Motion states
& give an example of it.
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Every action has an equal and opposite
reaction.
Sum up Newton’s Third Law
of Motion and give an
example.
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9.8 m/s2
What is the rate of
acceleration due to gravity on
Earth for falling objects?
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Mass is the amount of matter in an object
and weight is the gravitational pull on that
object.
Would your mass or weight
change if you went to the
moon?
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1. Masses of object (more mass means more
pull)
2. Distances between them (closer means more
pull)
What two variables does
Newton say affects the
gravitational pull between
objects?
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980 Newtons
How much does a 100 kg
person weigh in Newtons on
Earth?
Fg = m x g
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A trajectory is the path of a projectile while
a parabola is the curving shape of a thrown
object.
What is the difference
between a parabola and a
trajectory?
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B. Lowest spot
Where does a marble on a
roller coaster have the most
kinetic energy?
A. Highest spot B. Lowest
spot C. Middle of the hill
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Object must move in same direction as
applied force.
Why isn’t carrying a book
across the room considered
“work?”
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500 N-m or Joules of work
How much work is done if a
500 Newton person jumps 1
meter off the ground?
(Work = Force x distance)
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Energy cannot be created or destroyed.
Explain the Law of
Conservation of Energy.
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Only power changes since you take less
time running up the stairs.
When walking versus running up a
set of stairs, explain whether work,
power or both change.
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Buoyancy.
What is the upward force
exerted on an object placed in
a liquid?
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Which force is larger when an
object sinks?
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The weight of the object is MORE than the
weight of the water pushed aside if it sinks.
When an object sinks, how
does the amount of water
pushed aside compare to the
weight of the object?
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Gravity and air resistance.
What two forces are equal
and opposite when a falling
object reaches terminal
velocity?
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It would SINK since the buoyancy force is
not at least equal to the weight of the object.
If a 5 g object displaces 3 g of
water, explain whether it
would sink or float.
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