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What does modelling an object as a particle allow you to ignore?

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Its size, shape and rotational effects.

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Why does a light string need no separate equation of motion?

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Its mass is negligible.

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Why do particles connected by an inextensible string have equal acceleration magnitudes?

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The string cannot stretch, so their displacements remain equal.

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How are the speeds of particles connected by an inextensible string related?

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They have the same speed at any instant.

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What happens to tension as a light string passes over a smooth pulley?

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Its magnitude remains unchanged.

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What can a smooth pulley change about the tension force?

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Its direction, but not its magnitude.

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Newton's second law is $\\text{[...]}$, while the weight of mass $m$ is $mg$.

","back":"

Newton's second law is $\\boxed{F=ma}$, while the weight of mass $m$ is $mg$.

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Newton's second law is $F=ma$, while the weight of mass $m$ is $\\text{[...]}$.

","back":"

Newton's second law is $F=ma$, while the weight of mass $m$ is $\\boxed{mg}$.

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In which direction does a normal reaction act?

","back":"

Perpendicular to the contact surface.

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What horizontal contact force is absent on a smooth plane?

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Friction.

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Why is $R=mg$ for a particle moving horizontally on a smooth plane?

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It has zero vertical acceleration, so vertical forces balance.

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What does a negative calculated acceleration mean?

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The actual acceleration is opposite to the assumed direction.

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For a freely hanging particle accelerating downwards, how do its weight and tension compare?

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$mg>T$.

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For a freely hanging particle accelerating upwards, how do its tension and weight compare?

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$T>mg$.

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Two equal hanging masses are initially at rest. Predict their acceleration.

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$a=0$ because there is no resultant driving force.

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A freely hanging particle moves at constant speed. What is its ten

2.8.6 Forces and Newton's laws Flashcards

2.8.6 Forces and Newton's laws Flashcards