Forces Flashcards
What is a scalar quantity?
Only has a size (magnitude)
What is a vector quantity?
Has both a size and direction
What is a force?
A push or pull that acts on an object due to the interaction with another object
Is force a vector or scalar quantity?
Vector
Define contact force
Interaction between objects
Define non-contact force
When objects are physically separated
What is the same about the interaction pair of forces when two objects interact with each other?
Forces are the same size
What is different about the interaction pair of forces when two objects interact with each other?
Forces in opposite directions
Resultant force on an object if forces are balanced
Zero
Force acting on an object due to gravity
Weight
Instrument used to measure weight of an object
Newtonmetre
Define centre of mass
Point at which the weight of the object is considered to act
Define elastic deformation
When an object can return back to its orginal shape and size after force causing deformation is removed
Define inelastic deformation
When an object does not return back to its orginal shape and size after forces causing deformation have been removed
How do you find the spring constant from a force-extension graph of a spring?
Find the gradient of the straight line section
What is the turning effect of a force called?
A moment
What can you say about clockwise and anticlockwise moments on a balanced object?
Sum of all the clockwise moments about any point = sum of all the anticlockwise moments about that point
How does a lever reduce the amount of force needed to create a particular sized moment?
By increasing the distance from the pivot
What happens to the moment of a force when a small gear drives a large gear?
Moment is increased
