p5 - forces Flashcards
what is the difference between a scalar and vector quantity?
scalar: quantities with only magnitude and no direction
vector: quantities with direction and magnitude
give examples of vector and scalar quantities
vector: velocity
scalar: temperature
what is meant by:
- a force
- a contact force
- a non contact force
force: a push or pull that acts on an object
contact: objects are physically touching
non contact: objects are physically seperated
label examples of contact and non- contact forces:
contact: friction, air resistance and tension
non- contact: gravitational force, electrostatic, magnetic
describe the difference between mass and weight
mass: the amount of matter in an object
weight: the force acting on an object due to gravity
describe the relationship between the weight and mass of an object
directly proportional
define resultant force
resultant force: the overall force on a point or object
how is work done?
if a resultant force moves on an object
what is the equation for work and its unit?
work = force x distance
- measured in joules
define extension and elastic deformation
extension: change in length from the original length
elastic deformation: returns to the original shape when force is removed
define displacement
displacement: a vector quantity that measures the distance and direction in a straight line
explain the set up and method for an ‘ Investigating Springs practical ‘ [ 6 ]
1) measure the natural length of the spring with a millimetre ruler clamped to the stand
2) add a mass to the spring, record the mass and measure the new length of the spring
3) repeat then plot data on a force - extension graph
list the typical everyday speeds:
walking: 1.5m / s
running: 3m / s
cycling: 6m / s
car: 25m / s
train: 30m / s
plane: 250m / s
what does magnitude mean?
magnitude: size of a quantity
what is velocity a vector measurement of?
the rate and direction of motion
