Which of the following statements are true about work? Include all that apply. Work is a form of energy. A Watt is the standard metric unit of work. Units of work would be equivalent to a Newton times a meter. A kg•m2/s2 would be a unit of work. Work is a time-based quantity; it is dependent upon how fast a force displaces an object. Superman applies a force on a truck to prevent it from moving down a hill. This is an example of work being done. An upward force is applied to a bucket as it is carried 20 m across the yard. This is an example of work being done. A force is applied by a chain to a roller coaster car to carry it up the hill of the first drop of the Shockwave ride. This is an example of work being done. The force of friction acts upon a softball player as she makes a headfirst dive into third base. This is an example of work being done. An eraser is tied to a string; a person holds the string and applies a tension force as the eraser is moved in a circle at constant speed. This is an example of work being done. A force acts upon an object to push the object along a surface at constant speed. By itself, this force must NOT be doing any work upon the object. A force acts upon an object at a 90-degree angle to the direction that it is moving. This force is doing negative work upon the object. An individual force does NOT do positive work upon an object if the object is moving at constant speed. An object is moving to the right. A force acts leftward upon it. This force is doing negative work. A non-conservative force is doing work on an object; it is the only force doing work. Therefore, the object will either gain or lose mechanical energy.
Kinematics
A machine is a device that accepts energy in some available form and utilizes it to do a type of work. Energy, work, or power has to be transferred from one mechanical part to another to run a machine. While the transfer of energy between two machine parts, those two parts experience a relative motion with each other. Studying such relative motions is termed kinematics.
Kinetic Energy and Work-Energy Theorem
In physics, work is the product of the net force in direction of the displacement and the magnitude of this displacement or it can also be defined as the energy transfer of an object when it is moved for a distance due to the forces acting on it in the direction of displacement and perpendicular to the displacement which is called the normal force. Energy is the capacity of any object doing work. The SI unit of work is joule and energy is Joule. This principle follows the second law of Newton's law of motion where the net force causes the acceleration of an object. The force of gravity which is downward force and the normal force acting on an object which is perpendicular to the object are equal in magnitude but opposite to the direction, so while determining the net force, these two components cancel out. The net force is the horizontal component of the force and in our explanation, we consider everything as frictionless surface since friction should also be calculated while called the work-energy component of the object. The two most basics of energy classification are potential energy and kinetic energy. There are various kinds of kinetic energy like chemical, mechanical, thermal, nuclear, electrical, radiant energy, and so on. The work is done when there is a change in energy and it mainly depends on the application of force and movement of the object. Let us say how much work is needed to lift a 5kg ball 5m high. Work is mathematically represented as Force ×Displacement. So it will be 5kg times the gravitational constant on earth and the distance moved by the object. Wnet=Fnet times Displacement.
Which of the following statements are true about work? Include all that apply.
- Work is a form of energy.
- A Watt is the standard metric unit of work.
- Units of work would be equivalent to a Newton times a meter.
- A kg•m2/s2 would be a unit of work.
- Work is a time-based quantity; it is dependent upon how fast a force displaces an object.
- Superman applies a force on a truck to prevent it from moving down a hill. This is an example of work being done.
- An upward force is applied to a bucket as it is carried 20 m across the yard. This is an example of work being done.
- A force is applied by a chain to a roller coaster car to carry it up the hill of the first drop of the Shockwave ride. This is an example of work being done.
- The
force of friction acts upon a softball player as she makes a headfirst dive into third base. This is an example of work being done. - An eraser is tied to a string; a person holds the string and applies a tension force as the eraser is moved in a circle at constant speed. This is an example of work being done.
- A force acts upon an object to push the object along a surface at constant speed. By itself, this force must NOT be doing any work upon the object.
- A force acts upon an object at a 90-degree angle to the direction that it is moving. This force is doing negative work upon the object.
- An individual force does NOT do positive work upon an object if the object is moving at constant speed.
- An object is moving to the right. A force acts leftward upon it. This force is doing negative work.
- A non-conservative force is doing work on an object; it is the only force doing work. Therefore, the object will either gain or lose mechanical energy.
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