Problems and Questions on Physics Lab
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. Find the resultant of two forces of 40 lbs. and 50 lbs. acting at an angle of 60â—‹ between them.
2. Three forces of 30 gms, 50 gms, and 60 gms respectively act at an angle of 120â—‹ from each other. Find the resultant by rectangular-resolution (a) by making the 30-gm force lie on the x-axis, (
By making the 60-gm force lie on the x-axis.
3. A weight of 100 lbs is supported vertically by two ropes, one making 60â—‹ above the horizontal to the right and the other making an angle of 37â—‹ above the horizontal to the left. Find the tension on the ropes.
4. By rectangular resolution of forces, find the resultant of the following forces: P=40 gms along the x-axis toward the right. Q=50 gms, 30â—‹ above the horizontal toward the left; S = 20 gms vertically up; and T = 60 gms acting downward 30â—‹ to the left of the vertical.
5. Each end of a wire 17 inches long is fastened, respectively, to two hooks lying on the same horizontal line. The hooks are 13 inches apart. A 26-lb weight is suspended in the wire at a point 5 inches from one hook. Find the tension of each part of the wire.
6. What are the conditions for equilibrium for non-concurrent coplanar forces acting on a body?
7. A uniform bar 10 ft long weighs 15 lbs. A 5-lb weight is hung at one end of the bar. At what point must the bar be supported for it to remain horizontal?
8. A bar 12 ft. long weighs 20 lbs. Its center of gravity is 5 ft from one end. An 8-lb weight is hung 2 ft from the other end. If the bar is to remain horizontal, at what point should it be supported? -
In Singapore, we use the SI units for measurement purposes.
For weight, it's Newtons (N)
For mass, it's Kilograms (kg)
For length, it's Metres (m)
Not that your questions are entirely undoable though. Do you know about vector diagrams?