Question

Which of the following are true statements about Newton's three laws:

Forces come in pairs.
An object at rest will stay at rest if there is an unbalanced net force.
An object in motion will stay in motion unless acted upon by a balanced forced
We use force vectors to calculate the net force acting on an object
We can ignore reaction forces if they do not affect the physics of the object in question.
Force is directly proportional to the mass of an object.
If someone is standing on a surface without falling through then the normal force is weaker than gravity.
Force is directly proportional to the velocity of an object.

Answer 1

Newton's three laws of motion explain the behavior of objects in motion. Forces come in pairs, an object at rest will stay at rest if there is an unbalanced net force, and an object in motion will stay in motion unless acted upon by a balanced force.

Step-by-step explanation:

Newton's three laws of motion are foundational principles in physics.

1. Forces come in pairs: According to Newton's third law, for every action, there is an equal and opposite reaction. So, forces always come in pairs.
2. An object at rest will stay at rest if there is an unbalanced net force: This statement refers to Newton's first law of motion, also known as the law of inertia. An object at rest will remain at rest unless acted upon by an unbalanced external force.
3. An object in motion will stay in motion unless acted upon by a balanced force: This statement describes Newton's first law as well. When an object is in motion, it will continue moving in the same direction and at the same speed unless an external force acts on it.

Learn more about Newton's three laws of motion