Transcript Presentation

Potential and
Kinetic
Energy
Friction
Simple
Machines
Newton’s
Laws
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Forces in
Fluids
Motion
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Look at the diagram. What can be said of the car’s
motion at B?
What is stopped?
Back to you Alex
An empty aluminum soda can is heated for
several minutes with a high wattage hair dryer,
causing the heated, energized particles of air
inside the can to escape through the opening.
The can’s opening is quickly sealed with
strong tape. What will happen as the can
cools?
What it is crushed or implodes?
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According Newton’s 2nd Law, if
there is an increase in force, what
will happen to the acceleration of
the object?
What is it increases?
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The following is an example of which of
Newton’s laws?
In a balloon car, the action is the expelling
air. The reaction is the movement of the car
forward.
What is Newton’s 3rd law?
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What is the net force of a combined
force of 7N north with a force of 15
N south?
What is 8 N south?
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Why does a helium-filled balloon
float in air?
What is helium is less dense than air?
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Determine the average velocity of the race car
whose data is shown below.
Time
0
1
2
3
4
Distance
0
96
192
288
384
What is 96 m/s?
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Which correctly shows a wedge?
A.
B.
What is A?
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C.
A student wants to lift a 50 kg box. She has four
pulleys and a 20 m length of rope. Which
arrangement would have the greatest mechanical
advantage?
a. 1 pulley b. 2 pulleys c. 3 pulleys d. 4 pulleys
Daily Double
What is 4 pulleys ?
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What force is necessary to
accelerate a 1,250 kg car at a rate of
40 m/s/s, using the formula (F=ma)?
What is 50,000 N?
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Given the formula (acceleration = final velocity - starting
velocity divided by time), what is a plane’s acceleration
from Mobile to Saraland if the plane passes over Mobile
with a velocity of 8000 m/s north and then passes over
Saraland at a velocity of 10,000 m/s north 40 seconds later?
{a = (Vf - Vi)/t}
What is 50 m/s/s north?
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Two ramps have the same length. One (A) is
at 45 degrees. The other (B) is at 30 degrees.
Why does ramp B have a better mechanical
advantage?
What is 30 degrees because its less steep?
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If an athlete runs a 100 m race at a constant
speed of 5.0 m/s, how long will it take to run
the race? (s = d/t) You have to rearrange to
t = d/s
What is 20 seconds?
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Why do hydraulic devices use liquids
instead of gases?
What is gases can be compressed but
liquids can’t?
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What is the pressure exerted on the
floor by a 3,000 N crate with an
area of 2 m2? P = F/A
What is 1500 pascals?
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What is the density of a 20 cm3
sample of liquid with a mass of 25 g
(D=M/V)?
What is 1.25 g/cm3?
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What does a single pulley change
on an object?
What is direction only?
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What type of simple machine is a jar lid?
What is a screw?
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The 1st stoppered syringe in the picture was pushed
in to 1/3 its original volume. What happens to the
pressure?
What is pressure increases?
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This is the density of a 546 g fish that displaces
420cm3 of water. (D=M/V)
What is 1.3 g/cm3?
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Why does a motor produce less
mechanical energy than the energy
it uses?
What is some energy is converted to sound
and heat?
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Levers are divided into classes
based on the location of these 3
things.
What is the fulcrum, load, and effort?
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If an astronaut throws a ball in
space, when will the ball stop?
What is never unless it runs into
something?
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Which graph best represents the motion
of an object whose speed is increasing?
A.
B.
What is C?
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C.
Why can you run into a person and
knock them over if they are
standing still?
What is momentum?
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How would you describe the input
force and distance of a screw?
What is a small input force over a long
distance?
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If both a golf ball and a bowling ball are
moving at the same velocity, which ball has
more momentum?
What is the bowling ball because it has
more mass?
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A turtle exerts a force of 8 N and has a mass of 2
kg. What’s the turtle’s acceleration? (F=ma) You
have to rearrange to a = F/m.
What is 4 m/s/s?
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What is a hero’s resultant velocity,
if in an action film, he is running
forward along the top of a train
going 50 m/s, and chasing a villain
at a rate of 4 m/s?
What is 50 + 4 = 54 m/s forward?
Back to you Alex
What is the formula for Newton’s
2nd law?
What is F = ma?
Back to you Alex