Forces, Movement & Changing ShapeEdexcel IGCSE Physics: Flashcards

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What three things can a force change about an object?

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What three things can a force change about an object?: Its speed, shape or direction.
Is force a scalar or vector quantity?: A vector quantity — it has both magnitude and direction.
What is a resultant force?: The single overall force with the same effect as all the individual forces acting on an object combined.
What force always opposes motion?: Friction.
State the equation linking unbalanced force, mass and acceleration.: F = m × a.
State the equation for weight.: W = m × g.
What is stopping distance made up of?: Thinking distance + braking distance.
What is thinking distance?: The distance travelled during the driver's reaction time, before the brakes are applied.
Name two factors that increase braking distance.: Higher speed and wet/icy road conditions (also greater mass).
What is terminal velocity?: The maximum, constant speed a falling object reaches when air resistance equals its weight, giving zero resultant force.
State Hooke's law.: Extension is directly proportional to the applied force, within the limit of proportionality.
Define elastic behaviour.: The ability of a material to recover its original shape after the forces causing deformation have been removed.
A resultant force of 10 N acts on a 2 kg object. What is its acceleration?: a = F/m = 10/2 = 5 m/s².