AQA · Physics · 8463
GCSE Physics: Forces, accelerations and Newton's Laws of motion
Forces · AQA GCSE Physics (8463), specification point 4.5.6.2. Cards are generated from the exam board's own specification for "Forces, accelerations and Newton's Laws of motion", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What happens to a stationary object if the resultant force on it is zero?
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It remains stationary.
What happens to a moving object if the resultant force on it is zero?
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It continues to move at the same velocity — the same speed in the same direction.
When a vehicle travels at a steady speed, how do the resistive forces compare to the driving force?
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They balance it — resistive forces equal the driving force, so the resultant force is zero.
What must act on an object for its velocity to change?
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A resultant (non-zero) force.
The tendency of objects to continue in their state of rest or of uniform motion is called ?.
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inertia
How does the acceleration of an object depend on the resultant force acting on it?
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Acceleration is directly proportional to the resultant force (for constant mass).
How does the acceleration of an object depend on its mass, for a constant resultant force?
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Acceleration is inversely proportional to mass — doubling the mass halves the acceleration.
What does the symbol ∝ mean?
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"Is proportional to".
What is the equation linking resultant force, mass and acceleration?
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F = ma (resultant force = mass × acceleration).
What is the SI unit of force?
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The newton (N).
Define inertial mass.
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A measure of how difficult it is to change the velocity of an object, defined as the ratio of force over acceleration (m = F/a).
State Newton's Third Law.
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Whenever two objects interact, the forces they exert on each other are equal and opposite.
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