Section 2- Forces Flashcards
What is Newton’s first law?
If forces are balanced, the resultant force is 0, the systems state is in a ‘State of equilibrium.’
The object is either;
1.At rest
2.Moving with a constant velocity (velocity= constant speed, constant direction).
What is Newton’s second law?
The forces are unbalanced meaning there is a resultant force, the object will be forced to accelerate (accelerate= change in speed, change in direction).
What is mass measured in and what is mass?
Mass is measured in Kg & is the amount of matter in an object (the number of matter in an object never changes).
What is weight and what is it measured in?
Weight is measured in N (Newton’s). Weight is a force due to the pull of gravity on the object.
What is the calculation for weight?
Weight= mass X gravity
What is the calculation for Resultant Force?
FR= mass X acceleration
Or
FR= thrust + drag
When forces act on bodies they can cause them to what?
Change shape, change speed, change direction.
What is the calculation for acceleration?
A= FR/m Acceleration= Resultant Force/mass
What is Earths gravity?
10N/Kg
What is the acceleration of an object free falling from Earths surface?
A= 10m/s(squared)
What is Hooke’s Law?
Extension is proportional to stretching force
What is the equation for force?
F = Ke F = spring constant x constant
What is the equation for extension?
e = F/K
How would you work out the stiffness constant from a graph?
Force = spring constant + extension + O(were y cuts through the origin).
