Free Essays on Freefall

Why does a baseball that is thrown follow a parabolic path? This question is central to the study of projectile motion. Galileo was one of the first to study projectile motion. He correctly deduced that part of the motion of a projectile (such as the baseball) was accelerated and part of its motion was uniform. Suppose that a bullet is loaded into the barrel of a gun. Another identical bullet is held at the same height as the bullet in the barrel of the gun. At the moment that the bullet is fired from the gun, the held bullet is dropped. Which hits the ground first? The correct answer? They both hit the ground at the same time! According to Newton's first law of motion (the law of inertia), the bullet fired from the gun will continue in motion at the same speed unless acted upon by an outside force. The horizontal motion of the fired bullet is constant. The downward motion of both bullets is the same as a body in free-fall. Vertically, both bullets are uniformly accelerated by gravity. Both bullets are identical and are dropped from the same height. The only thing that makes the bullets hit the ground is gravity, and it acts on both the same. The result - both bullets hit the ground at the same time. The curved path of the baseball, or any projected object, is the result of both of these two motions occurring simultaneously. The projectile's horizontal motion is constant and its vertical motion is accelerated by gravity. Demonstration Horizontal Motion of a Projectile Imagine that a ball is launched horizontally at 2 m/s. Calculate its position at 0.05 sec intervals. time in seconds position in centimeters 0.05 sec 10 cm 0.10 sec 20 cm 0.15 sec 30 cm 0.20 sec 40 cm 0.25 sec 50 cm 0.30 sec 60 cm 0.35 sec 70 cm 0.40 sec 80 cm 0.45 sec 90 cm 0.50 sec 100 cm Vertical Motion of a Projectile Hang strings with washers on the ends on a meter stick representing the vertical motion of a ball in free fall at 0.05 ... Free Essays on Freefall Free Essays on Freefall Why does a baseball that is thrown follow a parabolic path? This question is central to the study of projectile motion. Galileo was one of the first to study projectile motion. He correctly deduced that part of the motion of a projectile (such as the baseball) was accelerated and part of its motion was uniform. Suppose that a bullet is loaded into the barrel of a gun. Another identical bullet is held at the same height as the bullet in the barrel of the gun. At the moment that the bullet is fired from the gun, the held bullet is dropped. Which hits the ground first? The correct answer? They both hit the ground at the same time! According to Newton's first law of motion (the law of inertia), the bullet fired from the gun will continue in motion at the same speed unless acted upon by an outside force. The horizontal motion of the fired bullet is constant. The downward motion of both bullets is the same as a body in free-fall. Vertically, both bullets are uniformly accelerated by gravity. Both bullets are identical and are dropped from the same height. The only thing that makes the bullets hit the ground is gravity, and it acts on both the same. The result - both bullets hit the ground at the same time. The curved path of the baseball, or any projected object, is the result of both of these two motions occurring simultaneously. The projectile's horizontal motion is constant and its vertical motion is accelerated by gravity. Demonstration Horizontal Motion of a Projectile Imagine that a ball is launched horizontally at 2 m/s. Calculate its position at 0.05 sec intervals. time in seconds position in centimeters 0.05 sec 10 cm 0.10 sec 20 cm 0.15 sec 30 cm 0.20 sec 40 cm 0.25 sec 50 cm 0.30 sec 60 cm 0.35 sec 70 cm 0.40 sec 80 cm 0.45 sec 90 cm 0.50 sec 100 cm Vertical Motion of a Projectile Hang strings with washers on the ends on a meter stick representing the vertical motion of a ball in free fall at 0.05 ...

How to Help an Attention-Seeking Child in the Classroom

How to Help an Attention-Seeking Child in the Classroom Its not uncommon for children in the classroom to do things to get your attention. Too much attention-seeking can be disruptive, causing trouble and creating distractions. The attention-seeking child will often interrupt a lesson by blurting something out. Their desire for attention is almost insatiable, so much so that the child often doesnt seem to care whether the attention they receive is positive or negative. In many cases, it doesnt even seem to matter how much attention you give them. The more you give, the more they seek. Causes of Attention-Seeking Behavior The attention-seeking child is in need of more attention than most. They seem to have something to prove and dont take as much pride intrinsically as they do extrinsically. This child may not have a sense of belonging. They may also suffer from low self-esteem, in which case they will need some help building their confidence. Sometimes, the attention-seeker is simply immature. If this is the case, adhere to the interventions below and the child will eventually outgrow their craving for attention. Interventions As a teacher, it is important to remain calm in the classroom even in the face of frustration. The attention-seeking child will always present challenges, and you must deal with them in an even-handed way. Remember that your ultimate goal is to help the child become confident and independent. When a childs attention-seeking becomes disruptive, sit down with them and explain that you have a number of children to work with each day. Provide them with a period of time that is just for them. Even a two-minute period before or after recess (a period where you can devote your attention exclusively to them) can be very helpful. When the child begs for attention, remind them of their scheduled time. If you stick with this strategy, you will find that it can be quite effective.Promote intrinsic motivation by asking the child to describe what they like about their work or how they performed. This is a great way to encourage self-reflection and help the child build confidence.Always commend the child on their improvement.During the childs special time, take time to boost their confidence by offering some inspiring words.Provide the child with responsibilities and a leadership role from time to time.Never forget that all children need to know that you care about them and that they ca n contribute in a positive way. It took the child a long time to become an extreme seeker of attention. Be patient and understand that it will take some time for them to unlearn this behavior. Remember that students, especially young students, dont always know what appropriate behavior is. Take time to teach them about appropriate interactions, responses, anger management, and other social skills. Use role-play and drama to help students understand other peoples feelings and perspectives.When you notice bullying, take the students involved aside and ask the bully to apologize directly to the victim. Hold students accountable for their harmful behavior.Have a zero-tolerance policy in place that is well understood.As much as possible, recognize and reward positive behavior.