PHY 121 EXAMS 1–4 2026 EDITION COMPLETE PRACTICE QUESTIONS AND CORRECT ANSWERS WITH DETAILED SOLUTIONS COMPREHENSIVE PHYSICS STUDY GUIDE AND FINAL EXAM REVIEW

PHY 121 EXAMS 1–4 2026 EDITION
COMPLETE PRACTICE QUESTIONS AND
CORRECT ANSWERS WITH DETAILED
SOLUTIONS COMPREHENSIVE PHYSICS
STUDY GUIDE AND FINAL EXAM REVIEW




Question options:


3.00 × 104 J




-5.20 × 105 J




2.75 × 105 J




-2.45 × 105 J - CORRECT ANSWER -2.75 x 10^5 J


4.2 The quantity Fd/t is


Question options:

,the power supplied to the object by the force.




the kinetic energy of the object




the work done on the object by the force.




the potential energy of the object - CORRECT ANSWER -the power supplied
to the object by the force


4.3 If you push twice as hard against a stationary brick wall, the amount of
work you do
Question options:


doubles.




remains constant but non-zero.




remains constant at zero.

,is cut in half. - CORRECT ANSWER -Remains constant at zero


4.4 What is the correct unit of work expressed in SI units?


Question options:


kg2 m/s2




kg m/s2




kg m2/s




kg m2/s2 - CORRECT ANSWER -kg m^2/s^2


4.5 If you walk 5.0 m horizontally forward at a constant velocity carrying a
10-N object, the amount of work you do is




more than 50 J.

, equal to 50 J.


less than 50 J, but more than 0 J.


zero. - CORRECT ANSWER -Zero


4.6 An object slides down a frictionless inclined plane. At the bottom, it has
a speed of 9.80 m/s. What is the vertical height of the plane?
Question options:


4.90 m




19.6 m




2.45 m




9.80 m - CORRECT ANSWER -4.90 m


4.7 Car J moves twice as fast as car K, and car J has half the mass of car K.
The kinetic energy of car J, compared to car K is2.1 When you sit on a chair,
the resultant force on you is