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Newtons first law - CORRECT ANSWERS An object will remain at rest or keep traveling at
constant velocity unless it is acted on by a resultant force
Newtons second law - CORRECT ANSWERS The resultant force acting on an object is equal to
the rate of change of its momentum
Newtons third law - CORRECT ANSWERS When two bodies interact, the forces they exert on
each other are equal and opposite.
Name the 7 base units - CORRECT ANSWERS meter, kilogram, second, ampere, kelvin, mole,
candela
Systemmatic error - CORRECT ANSWERS an error in readings which is repeated throughout the
experiment
Accuracy - CORRECT ANSWERS an accurate value of a measured quantity is one which is closer
to the true value of the quantity
Precision - CORRECT ANSWERS the smallest change in value that can be measured by an
instrument or an operator
Random error - CORRECT ANSWERS Inaccuracies when taking measurements
What causes upthrust - CORRECT ANSWERS Upthrust arises from the pressure which a fluid
exerts on an object. When there is more pressure on lower surface than the upper surface.
, What is a newton - CORRECT ANSWERS Force required to accelerate 1kg of mass by 1ms⁻²
weight on a slope - CORRECT ANSWERS w=mgsinθ
Define center gravity - CORRECT ANSWERS The point where all the weight of the object may
be considered to act.
Define moment - CORRECT ANSWERS Product of force and the perpendicular distance from
the pivot in which the force is acted upon
Define a couple - CORRECT ANSWERS Two parallel forces that are equal in magnitude, acting in
an opposite direction to create a turning effect but not causing the object to accelerate.
How to calculate torque of a couple - CORRECT ANSWERS One of the forces x perpendicular
distance between the forces
Conservation of energy - CORRECT ANSWERS Energy cannot be created or destroyed, it can
only be converted from one form another.
Define Watt - CORRECT ANSWERS The rate of transfer of energy of one joule per second
Conservation of momentum - CORRECT ANSWERS total momentum in a system before and
after the collision will remain constant unless acted on by an external force
Perfectly elastic collision - CORRECT ANSWERS -Both momentum and kinetic energy are
conserved.
-Relative speeds before and after stay the same.