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The friction force depends on the surface the block is sliding (slippery or rough) and the normal force on the block which is the force of gravity.
The image above shows a block pulled across a table. The spring scale which measures in Newtons reads the force resisting the motion known as friction force. In the image above, what would be a reasonable measurement of normal force if friction force measured 80 Newtons?
A) 40 Newtons
B) 60 Newtons
C) 70 Newtons
D) 140 Newtons
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