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P5 (Forces) - Forces up to Elastic Forces
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Gravity
Terms in this set (21)
elastic deformation
when a material deforms as stress is applied, but snaps back to its original shape when stress is removed
inelastic deformation
when an object doesn't go back to its original shape after a force has been applied
Hooke's Law is a proportional relationship
meaning if you double the force you double extension
Vectors
Quantities that have a magnitude and direction
Scalars
Quantities that only have a magnitude
Vector Examples
Force, velocity, displacement, acceleration, momentum
Scalar Examples
Speed, distance, mass, temperature, time
Contact Forces
A force that requires 2 objects to be touching
Non-Contact Forces
A force that does not require 2 objects to be touching
Contact Force Examples
Friction, air resistance, tension
Non-Contact Force Examples
Magnetism, gravity, electrostatic forces
Weight
The force acting on an object due to gravity
Mass
The amount of 'stuff' in an object
Weight Equation
Weight (N) = Mass (kg) x Gravitational Field Strength (N/kg)
Earth's Gravitational Field Strength
9.8N/kg (10N/kg)
Resultant Force
The overall force on a point or object
Extension Equation
Force (N) = Spring Constant (N/m) x Extension (m)
Friction
Force between 2 surfaces in contact. Acts in the opposite direction to movement
Newton's Third Law
When two objects interact, the forces they exert on each other are equal and opposite
extension is proportional to force
Hooke's Law
Hooke's Law applies until
elastic limit is reached
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