The answer is A, friction.
Friction is the force that resists movement, and that's why oil is used as a lubricant and why ball bearings are used for machines that need to move with very little friction(i.e. bike wheels, roller skates, fidget spinners)
Answer B is too vague
C will probably reduce efficiency greatly, but not specifically in a way that turns work into thermal energy.
D is the same as C, except that it places the blame on the person using the machine, not the machine itself.
Hope I helped clear it up for you :)
Answer:
Q9 is Elliptical and Q10 is sideways i think. Im not sure. Sorry if its not correct.
Explanation:
The man's pennile part that is most sensitive to sexual stimulation for the majority of men is THE FRENULUM.
This part is located on the underside of the p.ennis. It is an elastic band of tissue that connects the foreskin to the vernal mucosa. It is a very sensitive structure, especially to light and soft touch.
An immediate corollary for the special case of uniform motion is that Newtonian physics is inconsistent with his first law and is, instead, consistent with Galileo's definition of inertial motion.
Hope this helpsss!!!! :)))))
