I need help with the attached physics assignment
Lab: Projectile Motion
Student Lab Report
In this lab activity, you will investigate the motion of a horizontally launched projectile.
• marble or small ball
• stopwatch
• small weight
• table
• book or block
• string or fishing line
• meter stick
• ruler with groove down the middle
• masking or painter’s tape
• small weight or plumb bob
• calculator
• carbon paper
1. Set up a ramp to launch the marble (or ball). Use a book or block to prop up the
ruler so the marble can roll down the groove. As you are setting up the ramp,
consider the following:
• The ramp should be at an angle that allows as smooth as a transition
to the table as possible.
• The starting point on the ramp needs to give the marble a reasonable
velocity.
• The ramp should be set up with enough room for the marble to roll
across the table before it falls to the floor (about 30–50 cm). However,
this distance needs to be considered carefully. If the distance is too
short, you will not be able to accurately calculate the velocity of the
marble. If the distance is too long, the marble will be slowed down by
friction before it reaches the edge of the table and your velocity
calculations will not be accurate as the marble leaves the table.
• NOTE: As you are setting up the ramp, do not allow the marble to roll
off the table.
2. Tape the ruler to hold the ramp in place. Stick a piece of tape near the bottom of
the ramp where the marble begins to roll. Stick a second piece of tape at the
edge of the table where the marble will roll off (at least 30 cm apart). Measure
and record this distance (d).
3. Measure the distance from the top of the table to the floor. Measure and record
this distance (h).
4. Do a trial run to find the approximate location where the marble will hit the floor.
Mark this location by taping a piece of paper on the floor. Then put a piece of
carbon paper face-down over it. The carbon paper will leave a mark on the other
paper when the marble hits it.
5. Launch the marble five times, making sure you are consistent in how/where you
launch. Each time you launch, measure the time it takes the marble to roll across
the table (d), and make sure that the marks on the paper are close together as
the marble hits the floor.
6. Make a plumb line using the string and weight or plumb bob. Hang the string
from the edge of the table (where the marble leaves the table). Allow the weight
to hang to the floor to mark the spot on the floor directly below the edge of the
table.
7. Measure and record the distance from the weight or plumb bob to the center of
the marble landing points. This is the projectile range (R).
8. Change the position of your ramp (increase or decrease the incline) to change
the speed at which the marble is launched.
9. Repeat steps 4–7.
Ramp
Position
Distance
(cm)
Time (s)
Trial
1
Time (s)
Trial
2
Time (s)
Trial 3
Time (s)
Trial 4
Time (s)
Trial 5
Average
1
2
1. Calculate the average time (s) it took for the marble to travel the distance across
the table (d).
2. Calculate the velocity (v) of the marble as it rolled across the table.
3. Calculate the falling time of the marble. Falling time equals the horizontal
distance (R) divided by velocity.
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