science Flashcards
what is a force
a push or a pull when two objects interact
what is an unbalanced force
a push or pull when two objects interact, if unbalanced can cause a change in motion
what is an example of push
standing on a scale
what is an example of pull
using a spring ballance
what is calibrate
to check accuracy
what do you measure forces in and why?
newtons because Issac newton found the force of an apple falling
what is a balanced force
when the next force is the same
what is terminal velocity
when you have reached your maximun speed
what is a non contact force
gravity, magnetism, electrostatic
what is a contact force
friction, buoyancy and air resistance
what is a net force
the combination of all the forces acting on a object. e.g 1 person cant lift a piano, but multiple can because they are added more force
what is friction
the force that resits contact. slows down moving objects
what is the definition of density
how much mass is in a given volume
what is buoyancy
the upward force to keep something from sinking
what is surface tension
cohesion at the surface of a liquid. A skin at the top of a liquid
what is cohesion
molecules that are attracted to each other
what is gravity
attraction between 2 masses. pulle’s objects towards the centre of the earth
what is tension
transmitted through a rope, string or cable when pulled at both ends
what is applied force
a push, pull or twist that you apply
what is newtons 1st law of motion
an object remains at motion or rest unless acted on by an unbalanced force
what is newtons 2nd law of motion
when a net force acts on an object, the object accelerates
what is mass
the amount of matter in something and measured in gs or kgs
what is weight
mass x gravity and measured in newtons
