![]() ![]() The angle measure is defined as the angle between the force and the displacement. Perhaps the most difficult aspect of the above equation is the angle "theta." The angle is not just any 'ole angle, but rather a very specific angle. Where F is the force, d is the displacement, and the angle ( theta) is defined as the angle between the force and the displacement vector. Mathematically, work can be expressed by the following equation. StatementĪ teacher applies a force to a wall and becomes exhausted. Then click on the See Answer button to view the answer. Read the following five statements and determine whether or not they represent examples of work. In each case described here there is a force exerted upon an object to cause that object to be displaced. There are several good examples of work that can be observed in everyday life - a horse pulling a plow through the field, a father pushing a grocery cart down the aisle of a grocery store, a freshman lifting a backpack full of books upon her shoulder, a weightlifter lifting a barbell above his head, an Olympian launching the shot-put, etc. ![]() In order for a force to qualify as having done work on an object, there must be a displacement and the force must cause the displacement. There are three key ingredients to work - force, displacement, and cause. When a force acts upon an object to cause a displacement of the object, it is said that work was done upon the object. Thus, Lesson 1 of this unit will focus on the definitions and meanings of such terms as work, mechanical energy, potential energy, kinetic energy, and power. In order to understand this work-energy approach to the analysis of motion, it is important to first have a solid understanding of a few basic terms. ![]() The effect that work has upon the energy of an object (or system of objects) will be investigated the resulting velocity and/or height of the object can then be predicted from energy information. Motion will be approached from the perspective of work and energy. In this unit, an entirely different model will be used to analyze the motion of objects. In this manner, Newton's laws serve as a useful model for analyzing motion and making predictions about the final state of an object's motion. Acceleration information was subsequently used to determine information about the velocity or displacement of an object after a given period of time. Force and mass information were used to determine the acceleration of an object. In the first three units of The Physics Classroom, we utilized Newton's laws to analyze the motion of objects. ![]()
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