Question

Choose the correct statement in the parentheses.

• If an object has a constant velocity, there (must, may, or cannot) be a net force acting on it.
• If an object accelerates, there (must, may, or cannot) be a net force acting on it.
• If an object remains at rest, there (must may, or cannot) be a net force acting on it.
• If an object moves, there (must, may, or cannot) be a net force acting on it.

• The less mass a moving object has, the (harder, easier, none of the above) it is to stop it.
• The more mass an object at rest has, the (harder, easier, none of the above) it is to make it move.
• The more mass a moving object has, the (harder, easier, none of the above) it is to keep it moving.

Answer 1

Answers :

According to Newton's Law of motion : An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force.

• If an object has a constant velocity, there cannot be a net force acting on it.
• If an object accelerates, there must be a net force acting on it.
• If an object remains at rest, there cannot be a net force acting on it.
• If an object moves, there may be a net force acting on it.

The tendency of an object to maintain its state of motion, to remain at rest or to keep moving at a constant velocity, is known as inertia. Mass is a good measure of inertia; light objects are easy to move, but heavy objects are much harder to move, and it is much harder to change their motion once they start moving

• The less mass a moving object has, the easier it is to stop it.
• The more mass an object at rest has, the harder it is to make it move.
• The more mass a moving object has, the harder it is to keep it moving.