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Forces and Motion Flashcards
Free GCSE Physics Revision Cards
Work through Newton's laws, velocity-time graphs, momentum and resultant forces with these free Physics flashcards. Perfect for GCSE Physics and introductory A Level mechanics.
Question
What is Newton's First Law of Motion?
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Answer
An object remains at rest or in uniform motion unless acted upon by a resultant force.
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Question
What is Newton's Second Law of Motion?
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Answer
Force = mass × acceleration (F = ma); the resultant force is proportional to the rate of change of momentum.
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Question
What is Newton's Third Law of Motion?
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Answer
For every action there is an equal and opposite reaction — forces always act in pairs.
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Question
What is the difference between speed and velocity?
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Answer
Speed is a scalar (magnitude only); velocity is a vector (magnitude and direction).
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Question
What is acceleration?
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Answer
The rate of change of velocity: a = (v − u) / t.
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Question
What is the equation linking force, mass, and acceleration?
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Answer
F = ma (force in newtons, mass in kg, acceleration in m/s²).
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Question
What is momentum?
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Answer
Momentum = mass × velocity (p = mv), measured in kg·m/s.
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Question
State the law of conservation of momentum.
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Answer
In a closed system with no external forces, the total momentum before a collision equals the total momentum after.
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Question
What is the difference between weight and mass?
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Answer
Mass is the amount of matter (kg); weight is the gravitational force on that mass (W = mg), measured in newtons.
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Question
What is the value of g on Earth's surface?
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Answer
Approximately 9.8 m/s² (often rounded to 10 m/s² at GCSE).
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