Previously Tested Questions | Complete
Study Resource | A+
• vectors -✓✓forces with magnitude and direction
• scalars -✓✓forces with magnitude but no direction
• contact forces -✓✓requires contact eg friction
• non contact forces -✓✓doesnt require contact eg gravity
• mass and weigth -✓✓directly proportional
• weight -✓✓mass x gravitational field strength
• gravitational field strength on earth -✓✓9.81
• resultant force -✓✓the overal force acting on an object
• if a resultant force moves and object -✓✓work is done
,• scale drawings -✓✓triangular drawings, finding the hypotenuse
usually using pythagoras or trigonometry
• object in equilibrium -✓✓when to forces acting on the object are
balanced
• extension -✓✓directly proportional to force
• (spring) force -✓✓spring constant x extension
• limit of proportionality/elasticity -✓✓when an elastic object gets
stretched too much and it become plastic
• moment of a force -✓✓force x perpendicular distance from pivot to
the line of action of the force
• levers -✓✓make it easier to do work and increase the distance form a
pivot
• gears -✓✓transmit rotational effects
• pressure of an obeject -✓✓force ÷ area
, • pressure in fluids -✓✓height above point X density of fluid X
gravitational field strength
• pressure of a fluid -✓✓a force is exerted at right angles to any
surface in contact with the fluid
• a floating object -✓✓weight + upthrust
• objects in water -✓✓experience upthrust
• atmospheric pressure -✓✓decreases with height
• an object will sink... -✓✓if it displaces a volume of water less than the
objects weight
• an object will float... -✓✓if it displaces a volume of water more or
equal to the objects weight
• distance -✓✓is scalar
• displacement -✓✓is a vector