1. As you release the ballfrom the starting point (marked by tape), measure the

Question

1. As you release the ballfrom the starting point (marked by tape), measure the time it takesthe ball

to travel from the firstmoment it reaches the level of the table top (point A in Figure 1)until the

ball leaves the table top(point B in Figure 1). Enter this number into Table 1.

2. Divide the horizontaldistance on the table (between the ramp and the edge, measured frompoint

A to B, which should be0.7m) by the time. This will give the horizontal speed of the ball.Enter

this number into Table1.

3. Repeat Steps 1 & 2four more times and enter the results in Table 1.

4. Calculate the averagetime and speed and enter into Table 1 and Table 2. Also show yourwork

below Table 2. This is theaverage horizontal speed (vx) for theball released at this height.

Note: This is asimplified method for determining the horizontal speed. To be moreprecise, we

would use “timinggates”, like they use for track races.

5. Now release the ball fromthe same location and time the ball from when it leaves the tableuntil it

hits the floor. Do this 5times, enter your times in Table 1, and calculate an average foryou time

of flight,tflight.

6. Carefully measure thevertical distance from the top of the table to the floor where theball rolls

off. This is the verticaldistance y the ball will fall. Enter thisheight into Table 2.

7. Using Equation [2],calculate the time tfall it takes theball to fall from the end of the table to the

floor. This is the totaltime the ball is in the air, whether it is dropped vertically fromrest, or rolls

off the table, as in thisexercise. Enter this value in Table 2 and show your work below thetable.

8. Compare this timetfall with tflight Step 5.Calculate the percent difference in the space provided.

9. Next, you willmathematically predict where the ball will land on the floor. Thehorizontal distance

from the end of the track towhere the ball lands is called the range.Using your values for vx and

tfall calculate the horizontal range fromEquation [4]. Enter this value in Table 2.

10. Now place the empty canor cup at the predicted distance (range). Be careful to measurethe

distance from directly belowthe end of the ramp.

11. Roll the ball down theramp, releasing it from the same starting position.

Physics 101 (WEB)Northampton Community College

Projectile Motion

5

Table 1. HorizontalSpeed Data

Trial #dA to B(m)        Time,tAtoB(s)        Horiz.Speed, vx(m/s)        Time offlight tflight(s)

1           0.70                .42

2           0.70                 .51

3          0.70                 .41

4           0.70                 .40

5          0.70                 .40

AVG.     0.70

vx(m/s)        Vertical Height y(m)         Timetfall(s)               Range (m)

1. Horizontal SpeedCalculation (Step 4)--calculate the average time and speed andenter into Table 1 and 2--this is the average horizontalspeed (vx) for the release of the ball.

2. Time to fallCalculation (Step 7) using equation #-- deltay=vy ot+ogt^squarednehalf

3.Horizontal RangeCalculation (Step 9)The horizontal distance from the end ofthe track to where the ball lands is called the range.Using yourvalues for vx and tfall.calculate the horizontal range fromequation (4).Enter this in Table 2 equation 4-- d= range-vxt

Projectile Motion (WEB) Version: 11/23/05Page 4 of 5

Explanation / Answer

There is data that is missing to fully complete this lab. the data that is missing is the height of the table and time of flight that should have been measured.

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