SIFT Mechanical comprehension
Exam Questions with Solutions
Newtons 1st law of Motion - -An object at rest will remain at rest and an
object in motion will remain in motion until a force is applied
-Earths force of Gravity - -Fg = Kg or lbm x 9.8m/s^2 or 32.2 ft/s^2
Fg = m x g
-Newtons 2nd law of Motion - -Acceleration of an object will be proportional
to the sum of the forces being applied. F = M x A. M is mass in kilograms (kg)
or pounds mass (lbm) and A (acceleration) is expressed as m/s^2 or ft/s^2
-Newtons 3rd law of motion - -For every action there is an equal and
opposite reaction.
-Centripetal Force - -Is a force that makes an object travel along a curved
path
-Centrifugal Force - -Pulls an object toward the outside of the curved path
-Scalar - -Scalar values have magnitude but no direction
-Vector - -Tells how large an object is and the direction it's acting
-Torque - -Twisting force which attempts to rotate an object. T ( Newton
Meters (Nm) or foot pounds force (lbf-ft) = F (force) x R (torque arm or
distance from the fulcrum)
-Static Friction - -Is the force of friction when two objects begin to slide past
each other.
-Kinetic Friction - -Is the force of friction opposing an object as it is sliding
past another.
-Gravitational Potential Energy - -The higher an objects moves the more
potential it has. PE (joules or ft lbs force) = m (mass of the object) X gravity
(9.8 m/s^2) X h (height)
-1 Joule = (in newtons) - -1 Newton X 1 meter
-Conservation of Energy - -Energy cannot be created nor destroyed.
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Exam Questions with Solutions
Newtons 1st law of Motion - -An object at rest will remain at rest and an
object in motion will remain in motion until a force is applied
-Earths force of Gravity - -Fg = Kg or lbm x 9.8m/s^2 or 32.2 ft/s^2
Fg = m x g
-Newtons 2nd law of Motion - -Acceleration of an object will be proportional
to the sum of the forces being applied. F = M x A. M is mass in kilograms (kg)
or pounds mass (lbm) and A (acceleration) is expressed as m/s^2 or ft/s^2
-Newtons 3rd law of motion - -For every action there is an equal and
opposite reaction.
-Centripetal Force - -Is a force that makes an object travel along a curved
path
-Centrifugal Force - -Pulls an object toward the outside of the curved path
-Scalar - -Scalar values have magnitude but no direction
-Vector - -Tells how large an object is and the direction it's acting
-Torque - -Twisting force which attempts to rotate an object. T ( Newton
Meters (Nm) or foot pounds force (lbf-ft) = F (force) x R (torque arm or
distance from the fulcrum)
-Static Friction - -Is the force of friction when two objects begin to slide past
each other.
-Kinetic Friction - -Is the force of friction opposing an object as it is sliding
past another.
-Gravitational Potential Energy - -The higher an objects moves the more
potential it has. PE (joules or ft lbs force) = m (mass of the object) X gravity
(9.8 m/s^2) X h (height)
-1 Joule = (in newtons) - -1 Newton X 1 meter
-Conservation of Energy - -Energy cannot be created nor destroyed.
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