6. Units for measuring force, pound, gram.
Exercises
1. Name five natural forces. Which produce a tension? Which a pressure?
2. How much can you lift? Express in pounds and kilograms.
3. Show graphically the resultant of two forces at right angles, one of 12 lbs., the other of 16 lbs. What is the magnitude of this resultant? Then determine the answer, first by measurement and then by computation. Which answer is more accurate? Why?
4. Represent by a parallelogram the two forces that support a person sitting in a hammock and draw the line representing the resultant.
5. Find graphically the resultant of the pull of two forces, one of 500 lbs. east and one of 600 lbs. northwest.
6. Determine the equilibrant of two forces, one of 800 lbs. south and one of 600 lbs. west.
7. Would the fact that weight varies on going from the equator to either pole be shown by a spring balance or a beam balance? Explain.