Forces Flashcards
Explain the difference between scalar and vector quantities.
Scalars only have magnitude (and no direction)
Vectors have direction and magnitude.
True or false? Time is a vector quantity.
False
What is the difference between contact and non-contact forces?
Contact forces need to have 2 objects touching for the force to start and non-contact forces don’t.
Explain the difference between mass and weight.
Mass is the ‘amount of stuff’ in an object.
Weight is the force acting on an object due to gravity.
What is the formula for calculating weight?
weight = mass x gravitational field strength
What is a free body diagram?
A diagram that shows all the forces acting on an object.
What is a resultant force?
The overall force on a point or object.
Give the formula for calculating work done.
work done = force x distance
How many joules of work does 1 Nm equal?
1 J
Describe the forces acting upon an object in equilibrium.
They are completely balanced.
What is the difference between an elastic and an inelastic deformation?
Elastic deformation is when the object can revert to its original shape afterwards.
Inelastic is where it can’t
Give the equation that links force, extension and the spring constant of an object.
force = spring constant x extension
What is the limit of proportionality?
The limit to the amount of force that can be applied to an object for the extension to keep increasing proportionally.
What is the difference between displacement and distance?
Displacement is a vector and distance is scalar
Define acceleration in terms of velocity and time
The chance in velocity in a certain amount of time.
