Hang a pen by a piece of string.
1. Is the pen at rest or in motion? Explain.
2. Are there forces acting of the pen? Explain.
In the question is the pen at rest or in motion when you hang it, the answer is in rest with all of its potential energy stored. And for the second, are there forces acting on the pen? Yes, there are invisible forces acting on the pen, primarily gravitational force, which pulls it down towards the earth’s center and the tensile force being applied by the string.
Cut the string with a pair of scissors
3. What happens to the pen? What could have caused the pen's motion? Explain.
After you cut the string with a pair of scissors, the pen will tend to move in a downward motion. Apart from the gravitational force’s pull, the potential energy stored in the men was released after the string was cut and was converted into kinetic energy. What’s kinetic energy? Click here: https://brainly.ph/question/156495. For examples, you may click here: https://brainly.ph/question/77384.
Place a book on the top of a table
4. Is the book at rest, or in motion? Explain.
5. Are there forces acting on the book? Explain.
If you place a book on a table top, the book is expected to be at rest. It is at rest because the pull of gravity is being zeroed by the table. For the second question, yes there are forces acting on the book. Once more, gravity is the primary force and the normal force being exerted by the table.
To know more about gravity, you may click on this link: https://brainly.ph/question/1756013.
