Question

10. A boy can raise a rock that weighs 95 N by using a lever and applying a force of 15 N. what is the mechanical advantages of the lever? 11. What principle explains why lifting heavy objects is easier using ramps?

Answer 1

10. To know the mechanical advantage, we just need to find the ratio of the force produced by the machine (also known as the weight of the object it's trying to move) to the force applied to the machine.

Simply put, we need to use the following formula:
$MechAdvantage= \frac{ Weight_{object}}{ Force_{applied} }$
$MechAdvantage= \frac{ 95}{ 15} =6.33$

ANSWER: The mechanical advantage of the lever is 6.33

11. ANSWER: The wheel-and-axle principle. The wheel and axle is a kind of simple machine that has been used to greatly increase the mechanical advantage in complex machines. Its principle can also be applied to ramps, where the work is made easier as compared to lifting objects since a ramp would require you to exert less force.

Recalling the formula for the mechanical advantage in the previous item, a lesser force applied to the machine would mean that there would be a greater mechanical advantage.

Answer 2

The following are the answers to the questions presented:

 

1.    Mechanical Advantage = 95 ⁄ 15    

MA = 6.33

2.       The wheel-and-axle principle.

 

I am hoping that these answers have satisfied your queries and it will be able to help you in your endeavors, and if you would like, feel free to ask another question.