Mechanics: Dynamics

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What is Newton's first law of motion?
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Newton's first law, or the law of inertia, states that an object will remain at rest or in uniform motion unless acted upon by an external force.
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Define inertia.
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Inertia is the property of an object to resist changes in its state of motion.
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What is Newton's second law of motion?
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Newton's second law states that the force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).
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How is weight different from mass?
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Weight is the force of gravity acting on an object's mass, while mass is the amount of matter in the object.
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What is Newton's third law of motion?
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Newton's third law states that for every action, there is an equal and opposite reaction.
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Define friction.
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Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact.
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What factors affect the magnitude of friction?
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The magnitude of friction is affected by the nature of the surfaces in contact and the normal force pressing them together.
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What is the normal force?
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The normal force is the force exerted by a surface perpendicular to an object resting on it.
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What is terminal velocity?
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Terminal velocity is the constant speed an object reaches when the force of gravity is balanced by the drag force of the air.
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How can you calculate the tension in a rope?
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Tension can be calculated using Newton's laws, considering the forces acting parallel to the direction of the rope.
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Explain the concept of net force.
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Net force is the vector sum of all the forces acting on an object, determining the object's acceleration.
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How is kinetic energy related to work done?
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Kinetic energy is equal to the work done to bring an object from rest to its velocity.
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What is centripetal force?
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Centripetal force is the force that keeps an object moving in a circular path, directed towards the center of rotation.
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Describe the difference between static and kinetic friction.
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Static friction acts when objects are at rest, preventing motion, while kinetic friction acts on moving objects, opposing motion.
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What is momentum?
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Momentum is the product of an object's mass and velocity, indicating the quantity of motion an object has.
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