P5:forces and motion Flashcards
whats a contact force
when objects physically touch
whats a non contact force
when not touching
whats a vector
a quantity that has magnitude and direction
whats a scalar
quantity that only has magnitude
whats a resultant force
overall force acting on a object
give examples of scalars
distance, speed , mass, energy, temperature
give examples of vectors
displacement, velocity, acceleration, force, momentum
how is thinking distance affected
speed, distraction, alcohol, drugs and tiredness
how is breaking distance affected
speed, condition of breaks, tires and roads, weather condition
what does momentum(kgm/s) =
mass(kg) x velocity(m/s)
what are all the EM emitted by
electrons
how are EM waves produced
when electrons lose energy
What does a higher frequency mean
more energy which means shorter wave lengths
what does work done =
force x distance
what does force = when it comes to elasticity
spring constant (n/m) x extension(m)