What is inertia?
1.The motion of an object
2. A force that acts on an object at rest
3. the speed and direction of an object in motion
4. An object's resistance to a change its motion
4. An object's resistance to a change its motion
4. An object's resistance to a change in its motion
The correct answer for the definition of inertia is option 4: An object's resistance to a change its motion.
Now, let me explain how you can arrive at this answer.
Inertia is one of the fundamental concepts in Newtonian physics, described by Sir Isaac Newton's first law of motion, also known as the law of inertia. This law states that an object will remain at rest or continue moving in a straight line at a constant speed unless acted upon by an external force.
To better understand this, let's break down the options:
1. The motion of an object: This option is incorrect because inertia does not refer to the motion itself but rather the tendency of an object to resist changes in its motion.
2. A force that acts on an object at rest: This option is incorrect because inertia is not a force; it is a property of an object related to its tendency to resist changes in its motion.
3. The speed and direction of an object in motion: This option is incorrect because while inertia is related to an object's motion, it is not specifically about the speed and direction. It is about the object's resistance to changes in motion.
4. An object's resistance to a change its motion: This option is correct because it accurately describes inertia. Inertia is the property of an object that makes it resistant to changes in its velocity, whether that means starting from rest or changing the speed or direction of its motion.
Therefore, the correct answer is option 4: An object's resistance to a change its motion.