Newton’s first law says that an object at rest will remain at rest and an object in motion will remain in motion unless it is acted on by an outside force. This is the law of what, a. Gravity b. Inertia c. Momentum d. Velocity
b. Inertia
The correct answer is b. Inertia.
The law you are referring to is Newton's first law of motion, also known as the law of inertia. It states that an object at rest will stay at rest, and an object in motion will stay in motion, with a constant velocity, unless acted upon by an external force.
To determine the correct answer to your question, we need to examine the options provided:
a. Gravity: Gravity is the force that attracts objects towards each other. While gravity does play a role in the motion of objects, it is not specifically described by Newton's first law.
b. Inertia: Inertia is the property of an object to resist any change in its motion. Newton's first law is often referred to as the law of inertia since it describes the behavior of objects at rest or in motion.
c. Momentum: Momentum is a property of a moving object and is defined as the product of its mass and velocity. While momentum is related to motion, it does not directly describe the behavior mentioned in Newton's first law.
d. Velocity: Velocity is a measure of an object's speed in a specific direction. It is not the law itself but a parameter used to describe an object's motion.
Based on the explanations above, the correct answer is option b. Inertia.