Chemistry

Die worden van chemistry

Centre of gravity

An imaginary point where you can imagine gravity as being applied to an object

dynamometer

An instrument with a helical spring that is used to measure forces

elastic deformation

deformation in which the object regains its original shape once the force is no longer exerted

force

concept in physics that makes clear how objects change one another’s shape and/or motion

Force scale

ratio that you use to draw forces, shows the size of a force that is indicated by an arrow of 1 cm

gravity

the force with which the earth attracts you and all objects around you

magnetic force

A force that acts between the two poles, it can be a attraction or a repulsion

muscle strength

A force that arises when the muscles in a body contract

plastic deformation

Deformation in which the object remains deformed after a force has been exerted on it

resilience

A force that arises when you extend or compress a springy material

tensile force, tension

A force that arises in a rope if it is pulled at both ends

vector

way of representing the size, direction and point of application of a force as an arrow

directly proportional

two variables are directly proportional if they increase or decrease in a fixed ratio: if one variable decreases or increases nx, the other variable also increases or decreases nx

extensions

the increase in the length of a spring when a force is exerted on it

Normal force

a force that acts perpendicularly to the objects surface, An example is the force that a tabletop exerts on a fruit bowl

parallelogram

Method for finding the resultant when two forces have some arbitrary angle between them

resultant

the sum of forces acting on a object, the forces have to be added as vectors, not as numbers

spring constant

property of a spring extends when a force is exerted on it

zero position

the length of a spring that has not been extended

air resistance

resistance that arises because of a moving object has to push the air in front of it aside

friction

resistance that arises when two surfaces move against one another , such as a ski gliding over the snow

frontal cross-section

the surface of a object or person as seen from in front

newton’s first law

an object for which the resultant is 0n is either stationary or it moves along straight line with a constant speed

resistance

a force that resists a motion and act against that motion

rolling resistance

Resistance that arises when a rolling object and the ground both become deformed during the motion