We never think consciously about motion. How many times have we said something like: "I’m not strong enough to lift it!" or partied so hard we didn’t have enough energy to study for a test? Mechanics Part 1 will help us understand all this from the physical point of view. We will see what can cause, for example, a disc prolapse and to which mechanical loads our bodies are subjected. Here you can proceed to Mechanics Part 2.
Work is the result that takes place when a force is applied to an object to move it. Work can be measured by multiplying the force by the distance. It is closely related to energy. The concept referred to as work-energy principle states that an increase in the kinetic energy of an object is due to an equal amount of work performed on the object. The unit of work is the joule (J) which equals a newton-meter (N-m).
The lecture Work: Example 2 by Jared Rovny is from the course Work.
Included Quiz Questions
A bicycle has a kinetic energy of 124 J. What kinetic energy would the bicycle have if it had the same mass and was moving with twice the speed?
Ceres, which is the largest asteroid is our solar system’s asteroid belt, having an estimated mass of 3x 1021 kg and an orbital speed of 17900m/s. What is the amount of kinetic energy possessed by Ceres?
4.8 x 1029 J
2.5 x 1029 J
5.6 x 1029 J
3.9 x 1029 J
2.8 x 1029 J
Author of lecture Work: Example 2
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