According Peter M. McGinnis (2013) the Newton’s first law is about the linear kinematic and is called law of Inertia. This law states that, ‘everybody continues in it states of rest, or of uniform motion in a straight line, unless is compelled to change that state by forces impressed upon it’ (McGinnis, 2013, p.88). Simpler, the law of Inertia says that if there is no external force acts on a subject, that subject will not move and it will remain in states of rest or if it was moving it will continues moving at constant speed in the straight line.
Gravity based on Frank Bell (1998) is an external force that acts on all objects that are near to earth. This is the conclusion of all the objects to be attracted to the earth after the end of their …show more content…
Athletes occasionally perform jumps by using both legs before takeoff and after the landing on the ground. Based on James Christopher Radcliffe (1999) the starting position and initiation methods -when jumping for height- have significant value. There are several types of jumps such as squat jump, countermovement jump and depth jump. Squat jump is when the athlete want to perform a jump without a pre stretch movement, which executing a vertical jump from a static position of ankle, knee and hip flexion of specified degree. A countermovement jump is that the athlete starts from a standing position, makes a preliminary downward movement by flexing at the knees and hips, then immediately extends the knees and hips again to jump vertically up off the ground. One more is the depth jump. This jump describes the execution of a vertical jump after landing from a drop of a specified height, the flexion of the landing and the following extension of that …show more content…
The three options were Vertical jump with and without countermovement, football penalty kick with the right and left foot and walking or running. To analyze the data a Nixon camera with tripod was given to the students. Also a memory stick has given to each group to help them record their video and analyze the data on the computer.
Procedure
The students record there video as many times they need to be safe that they done the correct work. To make analyze more accrued the person who was the subject was dressed in shorts and mark his body with sticks. For the vertical jump experiment the marks was one in the ankle, one in the knee, and one in the hip. The background was a white wall to help the students to make analyze more accurate.
Data analysis
Kinovea program was used to analyze the data in the computer. On this program students can analyze degrees of the hip and knee extension flexion, velocity, and the distance between the subject and the ground. Also with this program they can found how many seconds their subject was in the
Gravity based on Frank Bell (1998) is an external force that acts on all objects that are near to earth. This is the conclusion of all the objects to be attracted to the earth after the end of their …show more content…
Athletes occasionally perform jumps by using both legs before takeoff and after the landing on the ground. Based on James Christopher Radcliffe (1999) the starting position and initiation methods -when jumping for height- have significant value. There are several types of jumps such as squat jump, countermovement jump and depth jump. Squat jump is when the athlete want to perform a jump without a pre stretch movement, which executing a vertical jump from a static position of ankle, knee and hip flexion of specified degree. A countermovement jump is that the athlete starts from a standing position, makes a preliminary downward movement by flexing at the knees and hips, then immediately extends the knees and hips again to jump vertically up off the ground. One more is the depth jump. This jump describes the execution of a vertical jump after landing from a drop of a specified height, the flexion of the landing and the following extension of that …show more content…
The three options were Vertical jump with and without countermovement, football penalty kick with the right and left foot and walking or running. To analyze the data a Nixon camera with tripod was given to the students. Also a memory stick has given to each group to help them record their video and analyze the data on the computer.
Procedure
The students record there video as many times they need to be safe that they done the correct work. To make analyze more accrued the person who was the subject was dressed in shorts and mark his body with sticks. For the vertical jump experiment the marks was one in the ankle, one in the knee, and one in the hip. The background was a white wall to help the students to make analyze more accurate.
Data analysis
Kinovea program was used to analyze the data in the computer. On this program students can analyze degrees of the hip and knee extension flexion, velocity, and the distance between the subject and the ground. Also with this program they can found how many seconds their subject was in the