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.
Force occurs when two objects interact with each other. Each object exerts a force on the other: a push or a pull. When the interaction between the two objects stops, then the force also disappears. This force can be separated into two categories: forces from contact and forces from action-at-a-distance. The difference between the two classifications is whether the two objects are in direct contact with each other or not. The unit of force is newton (N).
The lecture Tension: Example by Jared Rovny is from the course Force.
Included Quiz Questions
A 2 kg box of dry fruits is being pulled across a frictionless table by a rope at an angle of 600. The tension in the rope causes the box to slide across the table to the right with an acceleration of 3m/s2. What is the tension in the rope?
A 12kg mass on a slope is attached to a rope which goes over a pulley at the top and then connect to a mass of 20 kg. If the slope has an angle of 450 and the masses start from the rest, how far will the mass fall in 10 seconds?
A 60 kg circus performer is suspended by four 50 foot wires high above the crowd. The wires are all at an angle of θ between the ceiling and the performer. Which of the following describes the vertical component of force acting upon a single wire?
15(9.8) Sin θ.
60(9.8) Sin θ.
50(9.8) Sin θ.
Author of lecture Tension: Example
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