Transcript Presentation

Potential and
Kinetic
Energy
Friction
Simple
Machines
Newton’s
Laws
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Forces in
Fluids
Motion
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This is the SI unit of acceleration.
What is m/s/s?
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This is what acceleration is a
change in.
What is Velocity?
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This is what is determined when
you divide the distance a car travels
by the time it took to travel that
distance.
What is average speed?
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The driver of a car suddenly makes
a sharp turn, why will the passenger
slide to the side of the car?
What is inertia?
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Calculate the average speed of a car
that travels 500 km in 5 hours.
What is 100 km/h?
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Inertia is used to explain this
Newton’s Law.
What is the 1st Law?
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Of the following, 5000 kg dump
truck, 1000 kg car, 10 kg rock, or
1kg cat, the object with the greatest
inertia.
What is the 5000kg dump truck?
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A student kicks a 0.5 kg ball. Then
she kicks a 50 kg rock with the
same force. The acceleration of the
ball compared to the rock is this.
What is the ball’s acceleration is much
greater.
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This is a measure of the inertia of an
object.
Daily Double
What is the object’s mass?
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What force is necessary to accelerate a 1,250 kg car
at rate of 40 m/s/s, using the formula (F=ma)?
Daily Double
What is 50,000 N?
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An object moving in a straight line with a
constant speed has no unbalanced forces
acting on it. How will the object’s motion
change over time?
What is its motion will remain unchanged?
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This is the kind of friction that
causes a skydiver’s acceleration to
change as she falls.
What is fluid friction?
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This is the force that opposes the
motion between two surfaces
touching.
What is friction?
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This is the type of friction that you
use when you apply the brakes on a
car or bicycle.
What is sliding friction?
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This causes napkins to stay on the
picnic table even though there is a
slight breeze.
What is static friction?
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George applies 200 N to a machine
and the applies 2000 N to an object.
What is the MA? (MA = Force of
the load divided by the effort force)
What is 10?
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If a track athlete runs a 1600 m race at a
constant speed of 6.0 m/s, how long will it
take her to run the race? (s = d/t) You have
to rearrange this to t = d/s.
What is 267 seconds which when divided
by 60 equal 4.4 minutes?
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This is what the volume of fluid an
object displaces is equal to.
What is a volume with a weight equal to
that of the object?
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A car with a mass of 1400 kg moves along
the ice with a constant velocity of 18 m/s.
What is the car’s momentum? p = mv
What is a 25,200 kg m/s?
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What is the net force on an object if
one force has a magnitude of 10 N
and is directed toward the north and
the other has a magnitude of 5 N
and is directed toward the south?
What is 5 N north?
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Melissa wants to help her friend lift a box using a
board and a rock. Using the diagram below, where
should Melissa position the fulcrum in order to
minimize the amount of force needed to lift the
box?
What is a position D?
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What is thought might happen if
astronauts, who wear pressurized
suits in space, took their suits off?
What is they would explode?
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What is needed to calculate an
object’s acceleration?
What is starting velocity, ending velocity,
and time?
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Juan and Anita each lift an identical
stack of books the same distance
onto a table, but Anita does the job
twice as fast as Juan. Therefore, her
actions involve twice as much
what?
What is power?
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A student is given a 10 kg rock, four
boards (1m, 2m, 3m, and 4m) and a
fulcrum to make a lever. Which board
would have the greatest mechanical
advantage if the fulcrum is placed in the
same place relative to the load?
What is the 4 m board?
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This is the SI unit for energy.
What is the Joule?
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If a fluid flows from area A to area B, then
what must be the conditions of area B?
What is potential energy?
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The distance-time graph below depicts a moving
object. Over which interval is the velocity the
greatest?
What is between A and B?
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The same amount of force will produce
different accelerations, because the masses of
two shopping carts are different. This is an
example of which of Newton’s laws?
What is Newton’s 2nd Law?
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The table shows density of two types of plastic that have been placed in an aquarium filled
with water.
Substance Density
Plastic x 1.38 g/cm3
Plastic y 0.90 g/cm3
water
1.00 g/cm3
A student is given a mixture of 10 plastic beads that all look the same. Some of the beads
are made from plastic x and some are made from plastic y. Show a picture of what it
would look like.
What is the first picture?
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