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27 Cards in this Set
- Front
- Back
- 3rd side (hint)
Terminal velocity |
Constant velocity of a falling object when the net force is zero
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Newton’s first law of motion
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A body that is at rest continues to be at rest, and a body in motion continues to move with uniform velocity, unless a net external force acts on it.
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Newton’s second law of motion
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The rate of change of momentum of a body is directly proportional to the net force acting on it, and occurs in the direction of the net force.
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Newton’s third law
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If a body A exerts a force on body B, then body B exerts a force on body A of the same type and magnitude, but in the opposite direction.
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If body A...
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Inertia
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Inertia of a body is its reluctance to start moving and reluctance to stop once it has begun moving.
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Two cases
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Mass
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Mass is a measure of the inertia of an object.
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Weight
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The gravitational force acting on an object towards the centre of the Earth.
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Linear momentum
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p of an object is the product of its mass and its linear velocity.
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Impulse
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Impulse is the product of the force acing on an object and the duration over which it acts.
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Conservation of linear momentum
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The total linear momentum of a system remains constant provided that no net external force acts on it.
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Elastic
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A perfectly elastic collision is one where the total kinetic energy is conserved.
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RSOS = RSOA
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Derived from conservation of KE and of momentum. Get a difference of squares equation, then divide KE equation by momentum equation.
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Field of force
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Region of space in which an object can exert a force on certain bodies not in contact with it.
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Electric field
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Region of space in which a stationary charge will experience an electrical force.
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Gravitational field
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Region of space where a force acts on a mass.
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Magnetic field
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Region of space where a force acts on a moving charge or a magnet.
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Frictional force
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Force that opposes motion between two surfaces in contact.
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Viscous force
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Resistive force that an object experiences when it moves through a fluid.
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Fluid
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Tension
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Force exerted by a string or cable when it is pulled tight by opposite ends.
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Hooke’s law
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The magnitude of force exerted by a spring on an object attached to it is directly proportional to the length of extension from equilibrium, given that the elastic limit of the spring is not exceeded.
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Pressure
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Normal force exerted per unit area.
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Upthrust
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The force exerted on an object due to the displacement of fluid in which the object is submerged.
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Principle of flotation
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A submerged object displaces a weight of fluid equal to its own weight.
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Centre of gravity
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The point at which the whole weight of the object seems to act.
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Moment/Torque
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The product of the force and the perpendicular distance from the force to the pivot.
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Couple
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Two forces that are antiparallel, of equal magnitude, and do not act along the same line of action. They produce only a turning effect.
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Do not act along the same line of action!
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Equilibrium
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No net moment acting on the body about any point, No net force acting on the body. |
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