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Questions and Answers
الطاقة الحركية هي طاقة مُخزنة
False
القوة هي دفع أو سحب يُسبب تغييراً في حركة جسم أو شكله
True
تسارع الجسم هو التغير في سرعته مع الوقت
True
العمل هو نقل الطاقة من جسم إلى آخر من خلال قوة تم تطبيقها على مسافة
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السرعة هي التغير في مكان جسم مع الوقت
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القوة وغير مربوطين بالتسارع
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Study Notes
Energy
- Definition: The ability to do work
- Types:
- Kinetic energy (KE): energy of motion
- Potential energy (PE): stored energy
- Thermal energy: energy of heat
- Electrical energy: energy of charged particles
- Chemical energy: energy stored in chemical bonds
- Units: Joules (J)
Force
- Definition: A push or pull that causes an object to change its motion or shape
- Types:
- Contact force: force exerted through physical contact
- Non-contact force: force exerted through a distance (e.g. gravity, magnetism)
- Units: Newtons (N)
- Newton's Laws of Motion:
- Inertia: an object at rest remains at rest, an object in motion remains in motion
- Force and acceleration: F = ma (force equals mass times acceleration)
- Action and reaction: every action has an equal and opposite reaction
Acceleration
- Definition: The rate of change of velocity
- Units: meters per second squared (m/s^2)
- Calculated using: a = Δv / Δt (acceleration equals change in velocity divided by time)
- Related to force: F = ma (force equals mass times acceleration)
Work
- Definition: The transfer of energy from one object to another through a force applied over a distance
- Formula: W = F × d (work equals force times distance)
- Units: Joules (J)
- Types:
- Positive work: force and displacement are in the same direction
- Negative work: force and displacement are in opposite directions
Velocity
- Definition: The rate of change of an object's position
- Units: meters per second (m/s)
- Calculated using: v = Δx / Δt (velocity equals change in position divided by time)
- Related to acceleration: a = Δv / Δt (acceleration equals change in velocity divided by time)
- Types:
- Instantaneous velocity: velocity at a specific moment
- Average velocity: velocity over a period of time
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Description
اختبار يغطي مفاهيم الحركة والطاقة في الفيزياء، بما في ذلك القوة والسرعة والتسارع والعمل والطاقة الحركية والكيميائية والكهربائية
