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PHS Final Exam Questions And 100% Correct Answers
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PHS Final Exam Questions And 100% Correct AnswersCompared to Aristotle's method of describing nature, Galileo based his descriptions on -
ANSWER experiment
Inertia can be described as a - ANSWER property of all matter
For any object moving in a straight line at constant velocity the net force is - ANSWER
zero
Your automobile runs out of fuel and the engine stops. You do not immediately stop
because of - ANSWER inertia
Newton's second law deals with - ANSWER acceleration
A constant net force applied to a railroad car results in constant - ANSWER acceleration
A net force acting on an object causes it to move in a straight-line path. If the net force
applied to an object is doubled then the acceleration of the object will- ANSWER double
An object's mass is decreasing with time. Because its mass is decreasing, a constant
force applied continues to produce an acceleration that- ANSWER increases
Lillian pulls on a 25-kg cart with a constant force of 50 N. What is the wagon's
acceleration? - ANSWER 2.0 m/s^2
The air resistance of falling is greatly affected by an object's frontal area and - ANSWER
speed
,A pair of tennis balls fall through the air from a tall building. One ball is regular and the
other is filled with lead pellets. The ball to reach the ground first is the - ANSWER
lead-filled ball
After a ball tossed upward leaves your hand, the force of gravity on it - ANSWER
remains constant
Earth exerts a force on the Moon. These two bodies make up - ANSWER one interaction
A car traveling at 100 km/h strikes an unfortunate bug that splatters on the windshield.
The force of impact is greater on the - ANSWER same for both
Action and reaction pairs of forces always act on - ANSWER different bodies
The force that is applied to the tires of an automobile to accelerate the automobile
directly in a straight line down the road is applied by the - ANSWER road
A freight train rumbles down a set of tracks with great. If it moves at the same speed but
has twice the, then the momentum is - ANSWER doubled
A steel ball and a wood ball of equal size are dropped at the same time from a tower and
hit the ground simultaneously. The steel ball has a greater - ANSWER momentum
It is true to say impulse is equal to - ANSWER the change in momentum
Conservation of momentum is most closely related to Newton's - ANSWER third law
When bullets are fired forwards from a fighter aircraft the momentum of the aircraft -
ANSWER decreases
, A cannonball fired from a long-barrel cannon will have a greater muzzle velocity
because the cannonball receives a greater - ANSWER impulse
The unit kilowatt-hour is a unit of - ANSWER energy
An object may have potential energy because of its - ANSWER location
An object that possesses kinetic energy must be - ANSWER moving
Power is expressed as the - ANSWER work done divided by the time to do the work
If you perform work on an object in half the time, your power output is - ANSWER twice
When a bus brakes to a stop its kinetic energy changes into - ANSWER heat
A ball rolling down an incline has its maximum potential energy at - ANSWER the top
A ball rolling down an incline has its maximum kinetic energy at - ANSWER the bottom
A common pulley acts similar to a - ANSWER common lever
A simple machine cannot multiply - ANSWER energy
A machine puts out 100 W of power for every 1000 W put into it. The efficiency of the
machine is - ANSWER 10%
A jack system will increase the potential energy of a heavy load by no more than 1000 J
with a work input of 2000 J. The efficiency of the jack system is at most - ANSWER 50%
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