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Projectile Motion Lab

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Abstract

Objective

The objective of this experiment was to familiarize ourselves with constant acceleration equations, and to better understand the horizontal and vertical components of a projectile in free fall.

Procedure

In this experiment we used a PASCO projectile launcher, a photogate and the PASCO equipment to calculate the initial velocity of a ball that we launched off of a table. With this measurement we were able to use constant acceleration equations to calculate the range and the time of flight of the ball. We then used a “time of flight accessory” to obtain a measured value of time of flight. We compared our measured findings to our calculated findings to see the difference. Finally we created four graphs that illustrated horizontal and vertical velocity, as well as horizontal and vertical position all compared to time.

Data

Our ball was in flight for about .48 s and had an initial velocity of 3.14 m/s. In our vertical velocity verse time graph, I calculated the slope of the line to be 9.8 m/s^2. I am very happy with this result because it is very close to the real acceleration of gravity. Finally, our measured value of time of flight and calculated value deviated by .006s. This was also really cool to see.

Sources of Error

We did not take air resistance into consideration in this lab. As the ball is flying through the air, it is being slowed down by the air drag. This could have made our measured value of time of flight slower than it would have been in a situation with no air resistance.

Post Lab Questions

4. As the ball the rises, the vertical component of its velocity decreases because gravity is pulling the ball down. As the ball falls, the vertical component of its velocity increases because gravity is still pulling it down.

5. The vertical component of velocity for a projectile changes with time because it is accelerating due to the force of gravity. The horizontal component of velocity remains constant because the projectile is not accelerating in the horizontal direction. In other words, there is no applied force to the projectile horizontally, so its velocity remains constant.

17. Exactly one second later the horizontal speed will be 29.32 m/s. The velocity does not change with time in the horizontal direction. The vertical speed will be
23.69 m/s. Since the ball is thrown up, gravity will pull it down at 9.8 m/s^2. So one second later, the ball’s velocity should have decreased by 9.8 m/s.

28. The person in the plane will see the package below them as they continue to fly. In other words, it will look like the package is falling directly under them as the plane progresses forward. This is because the package still has the same horizontal component of velocity as the plane does. A person on the ground will see a package fall diagonally. Say the plane was moving to the right, the person on the ground will see the package moving to the right and falling at the same time. With air resistance, the package wouldn’t stay directly under the plane, the horizontal velocity would slow down and the person on the plane would lose site of the package. The person on the ground would see the package follow a more parabolic path, as air resistance would lower the velocity in the horizontal direction.

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