9 75 M S 2 example essay topic
438 words
Picket Fence (Photogate) Exp. 2 Purpose: To measure the acceleration due to gravity by measuring the tine of fall of a picket fence dropped through a photogate. Introduction: You drop a picket fence, a clear stripe with black bands, through a photogate. The photogate beam is blocked by band and the time between bands becomes increasingly shorter. The computer program, Science Workshop, calculates the average speed between bands. A graph of average speeds versus time gives the aci eration due to gravity. Data: The slope of the velocity versus time, from the graph was 9.75 m /'s 2. The acceleration mean, from the table display, is also 9.75 m /'s 2. Questions: My slope of the velocity time plot has a. 5% difference. The mean acceleration and the slope of the velocity versus tine are the same, 9.75 m /'s 2.
Although they both differ from the accepted value, 9.8 m /'s 2. I think air resistance is the main cause for the difference. I expect this graph to be constant. G from this graph would be 7.94 m /'s 2. This acceleration has a 19% difference which is mire than likely the effect of human error. With a polynomial fit, I found the acceleration to be 9.38 m /'s 2.
Shoot the Target Exp 4 Purpose: In performing a Monkey and Hunter experiment, the target will be the monkey and the projectile launcher will be the Hunter. This is to prove that the Hunter's bullet will always hit the Monkey, as long as the Monkey is less than the range of the gun and the Monkey releases itself exactly when the Hunter shoots. Theory: The ball will hit the target if the Launcher is aimed directly at the hanging target. Method: First you must aim the launch at the center of the target. Then disarm the photogate, put the ball into the launcher and cock. Before you go any further rearm the photogate.
Finally shoot the ball. Questions: 1. The gravitational acceleration is not vital in this experiment, because the target and the ball will fall at the same rate with any acceleration. 2. If the initial velocity of the ball had a different value, this experiment would still be successful. When the ball hits the target and their positions are equal, the time to reach the target would change with respect to the initial velocity.
3. Air friction would affect the projectile more than the target.
