P5 Flashcards
what is a force? (2)
- a push or pull that acts on an object due to the interaction with another object
- a vector with a size and direction
what do vector quantities have? What are some examples(5)?
magnitude and direction
- e.g forces, velocity, -displacement, acceleration, momentum etc
What do scalar quantities have?What are some examples(5)?
only magnitude (size)
- e.g - speed, distance, time, temp, mass, etc
what is displacement?
measures distance and direction in a straight line from an object’s starting point to it’s finishing point
what is the difference between mass and weight?
what is the difference between speed and velocity?
speed - how fast you’re going (e.g 30mph or 20m/s)
velocity - speed in a given direction (e.g 30mph, north or 20m/s , 060 degrees)
what is an interaction pair?
a pair of forces that are equal and opposite and act on 2 interaction objects
what are 5 examples of contact forces?
- friction
- air resistance
- normal contact force
- lift
- water resistance
what are 3 examples of non- contact forces?
- gravitational force
- magnetic force
- electrostatic force
what does the gravitational field strength (GFS) varie with?
with location
- GFS is stronger the closer you are to the mass causing the field and is stronger for larger masses
what does the weight of an object depend on?
the strength of the gravitational field at the location of the object
- so weight of object changes with it’s location
what is used to measure weight?
a calibrated spring balance or newtonmeter
what is the resultant force?
the overall force on a point or object
Tne sum of all forces or overall force acting on an object.
what is needed for an object to stretch, compress or bend when a force is applied to it?
more than one force acting on it
- otherwise the object will only move in the direction of the applied force instead of changing shape
when is an object elastically deformed?
when it can revert to it’s original shape and length after the force has been removed