A high jumper rims for a while before taking a high jump so that the inertia of ______ helps him take the long jump.
motion
Understanding Inertia in High Jumping
The question asks why a high jumper runs before taking a jump, relating it to the concept of inertia. Inertia is a fundamental property of matter, described by Newton's First Law of Motion, which states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an external force.
Exploring Inertia of Motion
Inertia resists changes in an object's state of motion. When an object is moving, its inertia of motion means it tends to continue moving. The faster an object is moving, the more momentum it has, and its inertia makes it harder to stop or change its direction.
How Running Helps the High Jumper
A high jumper runs to build up speed and momentum before the jump. By running, the jumper is in a state of motion. According to the principle of inertia of motion, their body will tend to stay in that state of motion. When the jumper plants their foot and pushes off the ground to jump upwards, the inertia of the forward motion developed during the run helps to carry their body upwards and over the bar. This forward momentum is converted, in part, into vertical motion and helps the jumper achieve a greater height than they could from a standing jump.
Therefore, the inertia that helps the high jumper is the inertia associated with their motion.
Analyzing the Options for Inertia
Let's look at the given options:
| Option | Explanation |
|---|---|
| 1. direction | Inertia is related to the state of motion (rest or motion) and the resistance to changing velocity (speed and direction), but "inertia of direction" is not the standard term used to describe the primary benefit of running before a jump in this context. |
| 2. rest | Inertia of rest means an object at rest tends to stay at rest. This is the opposite of what the jumper is trying to achieve by running. |
| 3. motion | Inertia of motion means an object in motion tends to stay in motion. This directly explains how the forward speed gained by running helps the jumper continue moving and contributes to the jump. |
| 4. shape | Inertia is a property related to mass and motion, not the shape of an object. Shape can affect air resistance or technique, but not the fundamental principle of inertia applied here. |
Conclusion on High Jump Inertia
Based on the analysis, the inertia of motion is the property that helps the high jumper carry the speed from their run into the jump, contributing to the height achieved.
Revision Table: Key Inertia Concepts
| Term | Definition | Relevance to High Jump |
|---|---|---|
| Inertia | Resistance of an object to a change in its state of motion. Depends on mass. | Underlying principle explaining why a force is needed to change the jumper's speed or direction. |
| Inertia of Rest | Tendency of an object at rest to remain at rest. | Relevant when the jumper is standing still, but overcome by the act of running. |
| Inertia of Motion | Tendency of an object in motion to remain in motion (at constant velocity). | Crucial for carrying forward momentum from the run into the jump. |
Additional Information on Inertia and Motion
Inertia is directly proportional to an object's mass. A more massive object has greater inertia and is harder to start moving, stop, or change direction.
Newton's First Law of Motion is often called the Law of Inertia. It highlights that objects naturally resist changes in their velocity. Running builds up a certain velocity, and inertia ensures that this velocity doesn't just disappear instantly when the jumper prepares to push off the ground. Instead, this motion contributes to the overall parabolic trajectory of the jump.
While the question mentions "long jump", the context is about a high jumper running. In both high jump and long jump, building speed through a run-up is essential, and inertia of motion plays a key role in maximizing the horizontal (for long jump) or contributing to the vertical (for high jump) distance covered during the jump phase.
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