Podcast
Questions and Answers
Increasing impact time with a cushion reduces the peak ______ experienced during a fall.
Increasing impact time with a cushion reduces the peak ______ experienced during a fall.
force
Impulse is defined as the change in momentum, which is calculated as ______ times time.
Impulse is defined as the change in momentum, which is calculated as ______ times time.
force
When falling on concrete, the impact is immediate, resulting in a very high peak ______.
When falling on concrete, the impact is immediate, resulting in a very high peak ______.
force
Cushions help to extend impact time, thereby allowing for a ______, softer landing.
Cushions help to extend impact time, thereby allowing for a ______, softer landing.
The concept of momentum is defined as mass times ______.
The concept of momentum is defined as mass times ______.
Momentum is calculated as mass multiplied by ______.
Momentum is calculated as mass multiplied by ______.
A heavier object has more ______ due to its mass.
A heavier object has more ______ due to its mass.
Impulse describes the change in momentum due to a force applied over a certain ______.
Impulse describes the change in momentum due to a force applied over a certain ______.
When an object impacts a surface, its momentum changes quickly, creating a ______.
When an object impacts a surface, its momentum changes quickly, creating a ______.
The longer the time over which a force is applied, the less intense that ______ can be.
The longer the time over which a force is applied, the less intense that ______ can be.
When falling onto a hard surface, the momentum change happens ______.
When falling onto a hard surface, the momentum change happens ______.
Soft surfaces like cushions allow for extended ______ time.
Soft surfaces like cushions allow for extended ______ time.
The impulse-momentum theorem states that impulse is equal to the change in ______.
The impulse-momentum theorem states that impulse is equal to the change in ______.
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Study Notes
Momentum
- Momentum is a measure of an object's motion.
- It is calculated by multiplying mass by velocity.
- Momentum indicates the difficulty of stopping a moving object.
- Higher momentum means a greater force or longer time is needed to stop the object.
Impulse
- Impulse is the change in momentum due to a force applied over time.
- Impulse is calculated by multiplying force by time.
- Impulse represents how much momentum changes with a force over a specific time period.
Impulse-Momentum Theorem
- The Impulse-Momentum Theorem states that impulse equals the change in momentum.
- This means the impulse acting on an object equals its change in momentum.
Impact Time and Force Distribution
- A short impact time results in a high peak force.
- Extending impact time reduces the peak force by spreading it out over a longer duration.
- Soft surfaces, such as cushions, increase impact time, reducing the peak force and making the impact safer.
Example
- Falling on concrete leads to a short impact time and high peak force.
- Falling on a foam cushion extends the impact time, resulting in a lower peak force.
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