Podcast
Questions and Answers
The energy derived from the digestion of food is __________.
The energy derived from the digestion of food is __________.
chemical energy
It is impossible to destroy energy.
It is impossible to destroy energy.
True (A)
Gravity is an attractive force that decreases as the mass of an object increases.
Gravity is an attractive force that decreases as the mass of an object increases.
False (B)
Deliberate practice is unnecessary to gain expertise.
Deliberate practice is unnecessary to gain expertise.
Human movement involves the complex interplay of many body systems.
Human movement involves the complex interplay of many body systems.
Which of the following statements about air is TRUE?
Which of the following statements about air is TRUE?
An object with a mass of 90 grams, moving at a constant velocity of 6 meters per second, has __________.
An object with a mass of 90 grams, moving at a constant velocity of 6 meters per second, has __________.
Assuming 50% efficiency, 150 kcals of chemical energy would result in __________ of kinetic energy.
Assuming 50% efficiency, 150 kcals of chemical energy would result in __________ of kinetic energy.
Friction is a force in which two objects __________.
Friction is a force in which two objects __________.
A parachute works because the canvas of the parachute is acted upon by __________.
A parachute works because the canvas of the parachute is acted upon by __________.
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Study Notes
Chemical Energy
- Energy derived from food digestion is classified as chemical energy.
Conservation of Energy
- Energy cannot be destroyed, adhering to the law of conservation of energy.
Gravity
- Gravity is an attractive force that increases with the mass of an object, not decreases.
Deliberate Practice
- Deliberate practice is essential for gaining expertise; it is not unnecessary.
Human Movement
- Human movement is a result of the intricate interaction among multiple body systems.
Air Composition
- None of the commonly held statements about air are universally true.
Momentum Calculation
- An object weighing 90 grams, traveling at 6 meters per second, has a momentum of 540 gram meters per second (calculated as mass × velocity).
Energy Efficiency
- At 50% efficiency, 150 kcals of chemical energy translates to 75 kcals of usable kinetic energy.
Friction
- Friction is the force that occurs when two objects slide against one another.
Function of a Parachute
- A parachute's operation relies on inertia, which acts on the canvas of the parachute during descent.
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