AC-HPAT Physics Certification Review Exam Questions And Answers.
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Course
AC HPAT
Institution
AC HPAT
What is Newton's first law? An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
What are scalar and vector quantities? Examples. Scalars are quantities that only have magnitude (or size), ...
distance - correct answer The length of a path between two points
Displacement - correct answer Distance and direction of an object's change in
position from the starting point.
position - correct answer the location of an object
Speed - correct answer The distance an object travels per unit of time
Acceleration - correct answer The rate at which velocity changes
instantaneous speed - correct answer the speed of an object at one instant of
time
Force - correct answer A push or pull on a object
net force - correct answer The combination of all forces acting on an object
constant speed - correct answer Speed that does not change
instantaneous speed - correct answer the speed of an object at one instant of
time
average speed - correct answer total distance divided by total time
, Newton's first law ( Aka Law of Inertia) - correct answer "An object at rest
remains at rest, and an object in motion will remain in motion unless acted upon by some external net
force."
A rock for example will remain at rest, it won't start spontaneously moving. An object in motion, that
does not encounter any friction will keep moving, like an object floating in space.
Newton's Second Law - correct answer Force = mass x acceleration ( F=ma)
To find acceleration: A= F/ m
" the acceleration an object experiences is directly proportional to the applied force and inversely ( in
the opposite manner) proportional to its mass.
Newton's Third Law - correct answer For every action there is an equal and
opposite reaction.
As a car hits a wall, it's force is applied to the wall but the force of the wall also acts on the car.
Remember, there can never be a single isolated force, forces always come in pairs.
coefficient of friction - correct answer the ratio of the force of friction to the
normal force acting between two objects. When you find a coefficient of friction, you're calculating the
resistance to motion at the interface of two surfaces of similar or dissimilar materials.
( a brick sliding on a clean wooden table, the coefficient of kinetic friction is about 0.5)
Torque - correct answer a turning or twisting force. Represented by T
Formula: T=Fd
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