Answers

2016-06-18T07:03:03+08:00
1. The pen is at rest, because it stays right in its place.
2.Yes, specifically tension force applied by the string and gravitational force of the earth.
3. The pen falls down. It due to the gravity or gravitational force.
4. The book is at rest, because it stays right in its place.
5. Yes, normal force is the force applied by the table that keeps the book right in its place and the gravitational force of the earth.
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