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Let’s take a look at how to calculate the time it takes to do work. Recall that a rate can be used to describe a quantity, such as work, over a period of time. Power is the rate at which work is done.
- 15.1 The Electromagnetic Spectrum
Teacher Support [BL] Explain that the term spectrum refers...
- 22.4 Nuclear Fission and Fusion
As shown in Figure 22.26, a neutron strike can cause the...
- 23.1 The Four Fundamental Forces
This graph of time versus position is called a Feynman...
- 11.1 Temperature and Thermal Energy
Heat is often confused with temperature. For example, we may...
- 22.1 The Structure of The Atom
and relating the wavelength to the frequency found using the...
- 23.3 The Unification of Forces
As discussed earlier, the short ranges and large masses of...
- 21.3 The Dual Nature of Light
Figure 21.10 shows a comet with two prominent tails. Comet...
- 15.1 The Electromagnetic Spectrum
The general formula for work and for determining the amount of work that is done on an object is: W = F × D × cos(Θ) where W is the amount of work, F is the vector of force, D is the magnitude of displacement, and Θ is the angle between the vector of force and the vector of displacement.
Physicists define work as the amount of energy transferred by a force. Learn about the formula for calculating work, and how this relates to the work-energy principle, which states that the net work done on an object is equal to the change in its kinetic energy. Created by David SantoPietro.
12 wrz 2022 · Example \(\PageIndex{4}\): Work Done by a Variable Force over a Curved Path. An object moves along a parabolic path y = (0.5 m −1)x 2 from the origin A = (0, 0) to the point B = (2 m, 2 m) under the action of a force \(\vec{F}\) = (5 N/m)y \(\hat{i}\) + (10 N/m)x \(\hat{j}\) (Figure \(\PageIndex{5}\)). Calculate the work done.
The equation for work lists three variables - each variable is associated with one of the three key words mentioned in the definition of work (force, displacement, and cause). The angle theta in the equation is associated with the amount of force that causes a displacement.
14 mar 2023 · Example \(\PageIndex{4}\): Work Done by a Variable Force over a Curved Path. An object moves along a parabolic path y = (0.5 m −1)x 2 from the origin A = (0, 0) to the point B = (2 m, 2 m) under the action of a force \(\vec{F}\) = (5 N/m)y \(\hat{i}\) + (10 N/m)x \(\hat{j}\) (Figure \(\PageIndex{5}\)). Calculate the work done.
David goes through some example problems on the concept of work. By reviewing these, you'll have a better knowledge of how to calculate work done by individual forces on an object in motion. You'll also understand the formula definition of work and how forces like tension, friction, and gravity play a role, and be able to apply the work-energy ...
