P5 Flashcards
What is the difference between scalar and vector quantities
scalar - magnitude
vector - magnitude + direction
Difference between contact and non contact
contact - objects are physically touching
non-contact forces - objects are physically separated
Is force scalar or vector
vector
Gives examples of contact and non contact forces
contact - friction, air resistance
non-contact - magnetic force, gravitational force, electrostatic force
Give two examples of scalar and vector quantities
scalar - speed, distance, mass, temperature, time
vector - force, velocity ,displacement, acceleration, momentum
What is an interaction pair
pair of forces that are equal and opposite and act on two interacting objects
What two things are directly proportional
weight and mass
What are the units for work done
Watts
1 newton-meter = how many joules
1 joule
What does work done against friction cause
a rise in the temperature of the object.
What does elastically deformed mean
object being able to go back to its original shape and length after the force has been removed
To stretch, compress or bend an object what is required
more than one force acting on the object
How is weight measured
a calibrated spring-balance
Define resultant force
Overall force acting on an object
What is work done
When a force causes an object to move through a distance work is done on the object.
What is elastically deformed
Objects that can be elastically deformed are called what
Object can go back to its original shape and length after the force has been removed
Elastic objects
What is inelastically deformed
Object that doesn’t return to its original shape and length after the force has been removed
What is the extension of an elastic object directly proportional to
force applied, provided that the limit of
proportionality is not exceeded.
What is extension
Increase in length of a spring when its stretched
What does the spring constant tell us
How many newtons it would take to stretch the object by one meter
What is Hooke’s law
Force and extension are directly proportional
When the spring graph starts to curve what does it represent
Limit of proportionality - object is inelastically deformed
