Sagot :
Answer:
it will not move
Explanation:
Unless you push the book, it will stay put just the way you left it. ... The book and spacecraft have inertia. Because of inertia, an object at rest rends to stay at rest. An object in motion tends to keep moving at a constant speed in a straight line.
Answer:
yes
Explanation:
The contact forces involve both normal forces and friction forces. The wall and the hand presses the book and the weight of the book tries to pull the book down, but friction forces from the hand and the wall prevent it. The only non-touching force on the book is the force of gravity from the earth pulling it down
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