P10 - Forces and Motion (PAPER 2) Flashcards
How does the acceleration of an object depend on the size of the force acting upon it
The bigger the size of the force, the greater the acceleration
How does the mass of an object affect the acceleration with a given force
the greater the mass, the smaller the acceleration
what is the formula for calculating the resultant force
resultant force (N) = mass (kg) x acceleration (m/s^2)
What is the inertia of an object
its tendency to stay at rest or in uniform motion
what is the difference between mass and weight
Mass - The quantity of matter in the object
Weight - The force acting on the object due to gravity
What is terminal velocity
the velocity it eventually reaches when it is falling
What is the resultant force when an object is falling at terminal velocity
0
What forces oppose the driving force of a vehicle
friction and air resistance
what is the formula for calculating momentum
momentum (kg m/s) = mass (kg) x velocity (m/s)
what is the unit for momentum
kg m/s (kilogram metres per second)
what is special about momentum in a closed system
- the total momentum before an event is equal to the total momentum after the event
- conservation of momentum
what is meant when an object is elastic
it returns to its original shape after removing the force deforming it
what is the formula for calculating extension
extension (m) = length after being deformed (m) - original length (m)
What is Hooke’s law
The extension of a spring is directly proportional to the force applied, as long as its limit of proportionality is not exceeded
What is a spring’s limit of proportionality
When the spring has been stretched so far that it cannot return back to its original shape after the force applied has been removed
