3. p. 329 what is the scientific unit used to measure force? 4. p. 330 what is a contact force? 5. p. 330…

3. p. 329 what is the scientific unit used to measure force? 4. p. 330 what is a contact force? 5. p. 330 what does it mean when you have an applied force? and give one example.

3. p. 329 what is the scientific unit used to measure force? 4. p. 330 what is a contact force? 5. p. 330 what does it mean when you have an applied force? and give one example.

Answer

Brief Explanations:

  1. In physics, the scientific unit for force is the Newton (N), named after Sir Isaac Newton. It is defined based on Newton's second - law of motion, $F = ma$ (force equals mass times acceleration).
  2. A contact force is a force that acts between two objects in physical contact with each other. For example, when you push a book across a table, the force exerted by your hand on the book is a contact force.
  3. Having an applied force means an external force is acting on an object. For example, when you kick a soccer ball, the force from your foot on the ball is an applied force.

Answer:

  1. The scientific unit used to measure force is the Newton (N).
  2. A contact force is a force between two in - contact objects. Example: pushing a book on a table.
  3. It means an external force acts on an object. Example: kicking a soccer ball.