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A. Six boxes held at rest against indentical walls. Rank the boxes on the basis of the magnitude of the normal force acting on them. Rank from largest to smallest. To rank items ass equivalent, overlap them.
- 130N–>7kg
- 150N–>1kg
- 150N–>7kg
- 120N–>3kg
- 140N–>5kg
- 140N–>3kg
(Since the boxes are at rest, Newton’s 2nd law dictates that the horizontal forces on each box must add up to zero. You can use this information to determine the normal forces. If two boxes are both pushed against the wall by the same force, then they should experience the same normal force.)
B. Rank the boxes on the basis of the frictional force acting on them. Rank from largest to smallest. To rank items as equivalent, overlap them.
- 130N–>7kg
- 150N–>1kg
- 150N–>7kg
- 120N–>3kg
- 140N–>5kg
- 140N–>3kg
It is that force which prevents sliding motion between stationary surfaces. The force is in opposition to any force outside that could cause the surfaces to shift relative to one another. Kinetic friction refers to the friction that is created when the movement is taking place. It brings the motion to a standstill.
We have:
N = -F
Fs = µsN
A. 2=3>5=6>1>4
B. 2=3>5=6>1>4