LINEAR MOTION 1
Drop the ball time how long it takes to reach the
first hill.
Which graphs fit each section of the ride
How do the equations explain the motion
How would you explain the forces acting on the
ball throughout the entire motion.
LINEAR MOTION 2
FREE FALL AND PROJECTILE MOTION
• Have a timer ready, toss the ball straight up and
catch it. Record the time, and divide the time by
2 since we only need half of the motion.
Calculate the max height using 9.8 m/s2 for
gravity
• Toss the ball to a partner diagram the motion,
– Identify acceleration, velocity at different points of
the motion
NEWTON'S 2nd LAW
Using the Atwood machine adjust the
weights to the car remains still
(equilibrium)
Adjust the weights so the car slowly
moves up the ramp
Adjust the weights so the car slowly
moves down the ramp.
• What can you observe?
• What can you measure?
• What can you calculate?
• What variables can you change?
• What do you predict would be the
result of your change?
INERTIA
• DESCRIPTION: Q: Two masses are hung in series from
a fixed point alternating with three rubberbands.
• When you pull downward on the third (bottom)
rubber band which of the rubber bands begins to
stretch first?
• Do you get the same result when you pull quickly
compared to when you pull slowly?
• Draw a force diagram showing how the tension
force changes in each rubber band based on your
pull.
• Based on the Upspring (Potential energy of spring)
equation how does the Potential energy of each
spring change when you pull on the system?
CONSTANT VELOCITY - GALILEO'S
EXPERIMENT
• PURPOSE: Show constant velocity and uniform acceleration
using a air bubble.
• DESCRIPTION: Rest the tube on the lecture table. Lift one
end to obtain constant acceleration. Lift one end of the
tube and immediately place it back on the table to obtain
constant velocity.
• Measure the length in meters of the tube, time how long
it takes the bubble to move in each tube?
• Find the acceleration of each tube when it is held straight
up and down.
• Experiment with changing the angle to see if you can
make all the tubes move with the same acceleration and
velocity diagram your results.
FREE FALL WITH MOTION SENSOR
• PURPOSE: EXAMINE MOTION AFFECTED ONLY BY GRAVITY.
• Hold the ball under the sensor, activate the sensor and toss
the ball up and down.
• Examine the data for velocity and acceleration.
• Repeat with a bigger or smaller toss.
• Use the formula to calculate the max height of the ball.
• Compare a distance/time and a velocity/time graph of the
motion.
• Draw a force diagram for the ball at the beginning, middle,
and end of the toss.
ANGULAR ACCELERATION
• PURPOSE: To demonstrate the direction of acceleration for both
linear and circular cases.
• Hold the accelerometer jar and notice which way the bobber
moves when you walk forward or backward.
• Spin the rotational accelerometer and notice which way the
bobber moves, spin it the opposite way.
• Based on your observations how is linear acceleration different
from angular acceleration?
• Based on the formula how does acceleration change if speed is
double (show your logic with an example of the formula)
• Based on the formula how will angular acceleration change if the
radius is reduced by ½ its distance (prove your point with a
mathematical example)
ORBIT CENTRIPETAL FORCE
(must experiment in hallway)
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Hold the tube with the string running through it
and the mass hanging towards the ground.
Begin spinning the satellite until the mass
begins to move upward.
How does the speed of the spin effect the force
created?
Compare the force of gravity to the force
created by the spin?
Discuss how this experiment relates to a
satellite maintains its orbit around the earth?
Based on Newtons Law of Gravity how must an
orbit change to accommodate doubling the
mass of a space station orbiting the earth?
CRANE BOOM
• PURPOSE: Analyze three configurations for the
crane boom.
• Use the spring scale to lift the crane boom
from 3 different points.
• Graph your data to show a pattern of force
verse distance.
• Calculate the torque created from each lift
point.
HAPPY VS UNHAPPY BALLS
• PURPOSE: To illustrate coefficient of restitution.
• DESCRIPTION: Drop the two balls simultaneously from the same
height. One bounces back to almost the original height, while the
other stops dead on impact. Which one is happy and which one is
unhappy.
• Find the velocity the balls hit the floor with using the kinematic
formula:
gravity is 9.8 m/s2
• Find the momentum using
• Based on your data what will happen if both balls are dropped on
top of each other?
• How did your prediction match what happened?
• Does it matter which ball hits the floor first, (why or why not)
MAXWELL'S PENDULUM
• Rotate the disc up to the top allowing the string to coil
around the rod.
• Let the disc go observing its motion.
• If the disc is 1 kg what is the Gravitational Potential
Energy (U)
• Since Gravity is pulling down a rotational force or
torque is pulling up. Which part of the disc (inside) or
outside contains more of the mass?
• Diagram the forces that are effecting the disc allowing
it to move up and down.
• Explain which force seems to be greater angular
momentum or gravitational energy.
NEWTON'S CRADLE
• The mass of each ball is .00025 Kg
• Pull one ball back and calculate the gravitational
potential energy (U)
• Release the ball and find the speed the ball hits.
(hint U = K)
• Diagram the forces that are effecting the cradle.
• Explain why when two balls are dropped two
different balls move on the opposite side using
conservation of energy.
HARMONIC MOTION
• Pull the Pendulum back to 15 degrees and use the monitor
to measure the period. Repeat at 30 degrees.
• What would happen at 60 degrees, why?
• Repeat the experiment by only changing the mass, reduce
the mass by half the washers.
• Based on your data what would happen if we tripled the
number of washers?
• Repeat the experiment only changing the length of the
string, on the second attempt reduce the length by ½, you
will need to lower the pendulum.
• What would happen if the length of the string were tripled?
• Use the Pendulum formula to explain why only the string
length had a noticeable effect on period?
• Diagram the pendulum including forces acting upon it, max
U, Max KE, amplitude.
POWER OF PLAY DOUGH
• Do you think Play dough will conduct a current or
resist a current.
• Attach the black wire to different colors of play
dough, then use the multimeter to measure the
current after the play dough.
• Using OHMS LAW find the resistance of each
color:
• Explain what was done in the experiment to
make sure the only quality of play dough tested
was the resistance of each color, what variables
were controled?