WTM Flashcards
state the equation for acceleration when given velocity and time
acceleration = change in velocity / time a = (v-u) / t
what will happen to an objects motion if the resultant force is zero
it will remain stationary or remain travelling at the constant velocity
how do you calculate resultant force
add the forces if they are acting in the same direction
subtract the forces acting in opposite directions
state the equation which links mass, weight and gravitational field strength
weight = mass x gravitational field strength w = m x g
state the equation which links force, mass and acceleration
force = mass x acceleration f = m x a
state the equation to calculate GPE
ΔGPE = m x g x Δh
state the equation to calculate KE
KE = 1/2 mv squared
what is meant by background radiation and where does it originate
the natural radiation level around us
space, ground, rocks and radon gas
what is an alpha particle
2 protons and 2 neutrons
state 3 ways in which medical staff can limit their exposure when working with radioactive sources
increase their distance from the source
shielding the source
minimise time spent in presence of sources
give 2 examples of scalar quantities
mass distance speed energy time
how is speed calculated from a distance/time graph
vertical difference between two point on the graph/horizontal difference between the same two points
what will happen if an objects resultant force is not zero
speed up
slow down
change direction
what is a vector quantity give four examples
magnitude and direction displacement velocity acceleration weight force
what is defined as the energy transferred per second and is measured in watts
power
