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Part (1):
Objective : To show that the time of flight of a horizontal projectile is independent of its initial
speed.
Procedures:
1- Open the following link (from PHET Simulation):
https://phet.colorado.edu/sims/html/projectile-motion/latest/projectile-motion_en.html
2- Set the height at 15 m, or any value
between (10 -15) m.
3- Adjust the angle of the launcher θ at zero
degree.
4- Set the velocity of the launcher at 10 m/s
and fire the ball then measure the timer
of flight (T) at the point where the ball
hits the ground.
5- Repeat the previous step for four
different values of velocity as shown in
table 1 and measure the corresponding time (T).
6- Report your data in Table (1).
Table (1)
V (m/s) Time of flight
(T) s
10
20
30
40
50
7- Discuss the results in Table (1).
……….……………………………………………………………………………………………………
……….……………………………………………………………………………………………………
8- What is the effect of air resistance on the range?
……….……………………………………………………………………………………………………
Part (2):
Objective : To verify that the horizontal component of the velocity (vx) of the projectile is
constant during its motion.
Procedures:
1- Open the same link:
https://phet.colorado.edu/sims/html/projectile-motion/latest/projectile-motion_en.html
2- Set the height at zero level, H=0 m as shown:
3- Adjust the launcher at θ = 50
o .
4- Set the initial velocity of the projectile v o at 21 m/s. (you are free to select the initial velocity)
5- Fix the height (H), initial velocity ( v o) and the angle (θ) at the above values and don’t
change them during this part.
6- Measure the time of flight for different horizontal distances as shown in the Table 2.
Table (2)
Distance X
(m)
Time of
flight (T) s
Horizontal velocity of the
projectile vx= X/T
7- Discuss your results in Table (2).
……….………………………………………………………………………………………………………
……….………………………………………………………………………………………………………
8- What are the velocity and the acceleration of the projectile at the highest point?
……….………………………………………………………………………………………………………
θ
o Sin (2θ) R (m)
Slope= …………………………………………
13- From the slope of (R-sin2θ) graph, calculate the acceleration of gravity:
gexp= ……………………………………………
14- Calculate the percentage error in g:
15- Attach the graphs to your lab report
Questions:
1- Derive the following equation:
………….………………………………………………………………………………………………………
………….………………………………………………………………………………………………………
2- Does a change in the angle of the projectile change the time of flight? If yes, explain how?
………….………………………………………………………………………………………………………
………….………………………………………………………………………………………………………
3- Refer to part (3), What angle produces the maximum range? Explain why.
………….………………………………………………………………………………………………………
δ g
%=
t =
2y
g
