# Lab experiment on kinetics

1) Ansewr the calculation questions of the attached file #1, using the chart of file #2.2) Use the course material to answer the follow up questions of file #1; in this course we learned the following concepts:
* summary of chapter 1:Forces are pushes or pulls. They are vector quantities, so they are described by a size and a direction of action. Arrows are used to represent forces graphically. Internal forces hold things together and cannot cause changes in the motion of a system. External forces may cause changes in the motion of the system. The most commonly felt external forces are gravity and contact forces. Friction and the normal reaction force are the two components of a contact force. Forces are added with the use of vector addition. We can accomplish this using graphical techniques, or using algebra if the forces are resolved into horizontal and vertical components. If the net external force acting on an object is zero, the object is standing still or moving in a straight line at constant velocity. If the object is standing still, it is in a state of static equilibrium, and the external forces acting on it are balanced and sum to a net force of zero. If the external forces acting on an object do not balance (i.e., they do not sum to zero), the object is not in equilibrium and will change its state of motion. In the next chapter, you will learn about motion and how it is described. Then you will be able to analyze objects that are not in equilibrium.
*summary of chapter 2:Motion may be classified as linear, angular, or a combination of the two (general motion). Most examples of human movement are general motion, but separating the linear and angular components of a motion makes it easier to analyze. Linear displacement is the straight-line distance from starting point to finish, whereas linear distance traveled represents the length of the path followed from start to finish. Velocity is the rate of change of displacement, whereas speed is the rate of change of distance. Acceleration is the rate of change of velocity. Displacement, velocity, and acceleration are vector quantities and are described by size and direction.The vertical and horizontal motion of a projectile can be described by a set of simple equations if the only force acting on the projectile is the force of gravity. The horizontal velocity of a projectile is constant, and its vertical velocity is constantly changing at the rate of 9.81 m/s2. The path of a projectile and its velocity are set once the projectile is released or is no longer in contact with the ground.We now have the terms to describe many aspects of the linear motion of an object: distance traveled, displacement, speed, velocity, and acceleration. But what causes linear motion of objects? How do we affect our motion and the motion of things around us? We have found some hints in this and the previous chapter. In the next chapter, we will explore the causes of linear motion more thoroughly.
*summary of chapter 3:he basics of linear kinetics, explaining the causes of linear motion, lie in Newton’s laws of motion. Newton’s first law explains that objects do not start moving or do not change their motion unless a net external force acts on them. An extension of the first law is the conservation of momentum principle. Newton’s second law explains what happens if a net external force does act on an object. The object will accelerate in the direction of the net external force, and its acceleration will be inversely related to its mass. The impulse–momentum relationship presents Newton’s second law in a way that is more applicable to sports and human movement. The basis for the techniques used in many sport skills is in the impulse–momentum relationship. Increasing the duration of force application increases the change in momentum. Newton’s third law explains that forces act in pairs. For every force acting on an object, there is another equal force acting in the opposite direction on another object. Finally, Newton’s law of universal gravitation gives us the basis for the force of gravity.