embroidery hoop with stiffer (less flexible) materiål šuch as sever al ers of cl
ID: 1793422 • Letter: E
Question
embroidery hoop with stiffer (less flexible) materiål šuch as sever al ers of cloth table top . wall 50- and 100-g masses Activity 3-1: Calculating Normal Forces In the diagram on the right, a book is sitting on the table. The book is not moving, so the net force on it must be zero. Question 3-1: If the mass of the book is m, what is the magnitude of the gravitational force on the book? What is the direction of this force? Question 3-2: If the net force on the book is zero according to Newton's first law, then what magnitude force must the table exert on the book? What is the direc- tion of this force? Question 3-3: What would the book do if the table didn't exert a force on it? (Suppose that the table is suddenly removed.) Activity 3-2: A Mechanism for Normal Forces By applying forces perpendicular to flexible surfaces with different deg stiffness up in reaction to forces applied to a surface. of you can discover a mechanism for the passive normal forces that crop 1. Hold the embroidery hoop with the elastic rubber vertical and press in the center pendicular to the rubber surface. Observe what happens to the center per-Explanation / Answer
3.1) the gravitational force on the book is its weight = mg which always acts downwards and perpendicular to the earth.
3.2) to balance this weight a force is applied by the table in upward direction (perpendicular to the surface) whcih is also equal to the weight = mg
3.3) if there is no table or no upward force ...only force acting on the body is gravitational force, whcih acts downwards.....so that it falls.
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