Questions and Answers
In which situation is the work done by the force on the object most positive?
When the force is in the same direction as the displacement
What is the unit of work?
Newton (N)
Under what condition is work negative for a constant force?
$90° < \theta ≤ 180°$
What does $W = Fd$ represent?
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Rank the situations in order of the work done by the force on the object, from most positive to most negative.
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Study Notes
Work and Kinetic Energy
- Work is done by a force acting on an object when the point of application of that force moves through some distance and the force has a component along the line of motion.
Work Done by a Constant Force
- The work done on an object by an agent exerting a constant force is the product of the component of the force in the direction of the displacement and the magnitude of the displacement: 𝐖 = 𝐅𝐝
- The work done by a constant force is also given by: 𝐖 = 𝐅𝐜𝐨𝐬𝛉 𝒅, where 𝛉 is the angle between the force and displacement vectors
- The sign of the work depends on the direction of F relative to d
- The unit of work is the Joule (J), which is defined as 𝑵.𝒎 = 𝒌𝒈.𝒎𝟐 /𝒔𝟐
Kinetic Energy
- Kinetic energy is the energy an object possesses because of its motion
- Energy is the capacity of an object for performing work
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