Forces Flashcards
What is a vector quantity and examples
A quantity with a magnitude and direction
Force
Velocity
Displacement
Acceleration
What is a scalar quantity and examples
A quantity with only magnitude
Mass
Speed
Distance
Time
What makes a force a contact force?
When two objects are touching e.g. air resistance
What makes a force a non-contact force?
When the objects don’t need to touch for a force to act e.g. gravity
What are two effects of gravity?
Makes everything fall
Gives everything a weight
What is mass?
The amount of matter in an object/body, measured in kilograms
What is weight and what is it measured in?
The force acting on an object due to gravity, measured in newtons
What is the resultant force?
The overall force on an object
What happens when a force moves an object?
Energy is transferred and work is done on the object
How can an object reach equilibrium?
When all the forces acting on an object combine to give a resultant force of zero
What does an object being elastically deformed mean?
When it can return to its original shape once the force is removed
What does an object being inelastically deformed mean?
When it cannot return to its original shape once the force has been removed
What is extension?
When an object increases in length/stretched
What is Hooke’s Law?
Extension of a spring is directly proportional to the force applied
What is the limit of proportionality?
Where Hooke’s Law breaks - the spring will not return to it’s original length if stretched too much
