Studied by 4 people
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
Note 
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