In order for a force to do no work on an object
A. All forces must do work.
B. The object is stationary, or the force is perpendicular to the motion
C. The force is perpendicular to the direction of motion
D. The object is stationary
Ans: B. The object is stationary, or the force is perpendicular to the motion
You might also like to view...
Heat is energy that is transferred between objects that are in thermal contact because of a temperature difference
Indicate whether the statement is true or false
A constant torque is applied to a flywheel. Which of the following mechanical quantities will be constant?
A. Angular momentum B. Rotational acceleration C. Rotational velocity D. Rotational energy E. Linear velocity of a particle on the rim
A locomotive is pulling 19 freight cars, each of which is loaded with the same amount of weight. The mass of each freight car (with its load) is 37,000 kg
If the train is accelerating at 0.22 m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car, and friction is negligible.)
When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave)?
a. perpendicular b. parallel c. anti-parallel (in opposite direction) d. Both choices b and c are valid.