Forces & Their InteractionsOxford AQA IGCSE Physics: Flashcards

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Name three non-contact (field) forces.

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Name three non-contact (field) forces.: Gravity, electrostatics, and magnetism.
Name three contact forces.: Any three of: friction, air resistance, tension, normal contact force.
What is friction and what can it cause?: A force between two surfaces that impedes motion, and may result in heating of the surfaces.
How are forces between two interacting objects represented?: As vectors, since each force has magnitude and direction; each object exerts a force on the other.
Give three examples of scalar quantities.: Any three of: distance, speed, time.
Give three examples of vector quantities.: Any three of: displacement, velocity, acceleration, force, momentum.
What is the difference between a scalar and a vector?: A scalar has magnitude only; a vector has both magnitude and direction.
Give the equation for weight.: W = m x g, where m is mass and g is gravitational field strength.
Describe elastic distortion.: A change in shape from which the object returns to its original shape once the force is removed.
Describe inelastic distortion.: A change in shape from which the object does not return to its original shape.
What happens to a force applied to an elastic object?: It stores elastic potential energy in the object.
State Hooke's Law and its equation.: The extension of a spring is directly proportional to the applied force (within the limit of proportionality): F = k x e.
In the required practical for Hooke's Law, what is measured and plotted?: Known forces (from added masses) are applied to a spring, the resulting extension is measured with a ruler, and force is plotted against extension.