projectiles lab

8/3/2019 Projectiles Lab

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Hugo Lee

Block 1-3

October 4, 2011

Projectiles Lab

Purpose:

To understand and calculate kinematics in projectile motion.

Big Ideas:

The x and y components of a vector are independent of each other. HDYK; velocity in the x-direction

remains constant while the velocity in the y-direction is affected by gravity.

Friction and air resistance affect the results. HDYK; measured results and calculated results are different.

Time is the same for both x and y vectors, is constant, and always existent. HDYK; some equations

require acceleration, whose value is gravity, which is a y-vector, and cannot be used to calculate x-vectors.

Data and Results:

Visual of Procedure:


2/4

Hugo Lee

Block 1-3

October 4, 2011

Data Table: (Part One)

Trial Velocity (m/s) Pulse Time (s) Distance of Photo Gates

(m)

1 1.195 0.08370 0.100

2 1.200 0.08335 0.100

3 1.198 0.08350 0.100

4 1.198 0.08347 0.100

5 1.199 0.08337 0.100

Average 1.198 0.08348 0.100

vavg = (v1+v2+v3+v4+v5) 5

= (1.195+1.200+1.198+1.198+1.199) 5

= 1.198m/s

tavg = (t1+t2+t3+t4+t5) 5

= (.08370 + .08335 + .08350 + .08347 + .08337) 5

= .08348s

Predictions (Calculations attached):

Hang-time: 0.431s

Distance: 0.516m

Part TwoLanding Distance

Trial Distance (m)

1 0.535

2 0.537

3 0.539

4 0.540

5 0.542

Average 0.539

davg = (d1+d2+d3+d4+d5) 5

=(.535+.537+.539+.540+.542) 5

= 0.539 m


3/4

Hugo Lee

Block 1-3

October 4, 2011

Graph:

Time (s) Vertical

Distance

(m.)

0 0.901

0.05 0.889

0.1 0.852

0.15 0.791

0.2 0.705

0.25 0.595

0.3 0.46

0.35 0.301

0.4 0.117

0.4288 0.00

Percentage Error

% Error =

%Error =

% Error = 4.3%

Vertical Distance Calculations

dv = htable(

1. .901 = .901 - ( 2. .889 = .901 - ( 3. .852 = .901 - ( 4. .791 = .901 - ( 5. .705 = .901 - ( 6. .595 = .901 - ( 7. .460 = .901 - ( 8. .301 = .901 - ( 9. .117 = .901 - ( 10.0.00 = .901 - (


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Hugo Lee

Block 1-3

October 4, 2011

Analysis:

4a. Friction and air resistance could have caused the ball to slow down, as when we calculated

the velocity, we did not account for friction or air resistance. This in turn causes inaccuracies

from our prediction and actual measured values.

b. There should be three sig figs because out of all the measuring devices we used, the ruler gave

the least amount of sig figs, which was three.

9a. The ball will roll faster and it will have more time to drop, thus increasing the distance

travelled. This is because the ball generates speed from rolling down the ramp affected by the

force of gravity, and if the height of the ramp is increased, gravity can act on the ball for a longer

time which increases the velocity of the ball.

b. The ball will travel farther because the time it takes for the ball to fall will increase, as well as

allowing more time for the velocity in the x-direction to act on the ball.

c. Increasing the mass of the ball should have no effect on its trajectory (unless the shape

changes) because mass does not affect the velocity of the ball.

projectiles lab

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