Which of the following is true of inertia?
a. It is described in Newton's first law of motion
b. It is a property of motion
c. It is measured by weight
d. all of the above
a and b
The correct answer is:
d. all of the above
To determine the correct answer, we need to understand the concept of inertia and how it is described. Inertia is the tendency of an object to resist a change in its state of motion. It is described in Newton's first law of motion, which states that an object at rest will stay at rest, and an object in motion will stay in motion, unless acted upon by an external force. This means that an object with more inertia will be more resistant to any changes in its motion.
Inertia is indeed a property of motion because it refers to the object's resistance to changes in its motion. It is not directly measured by weight. Weight is a measure of the force of gravity acting on an object, while inertia is independent of the gravitational force. However, we can indirectly observe that objects with greater weight often have greater inertia because they require more force to move or change their motion.
Therefore, the correct answer is d. all of the above, since inertia is described in Newton's first law of motion, it is a property of motion, and while it is not directly measured by weight, it can be observed to be related to the weight of an object.