Answer:
Correct answer: positive acceleration indicates accelerated movement (motion) and negative acceleration indicates slow movement (motion)
Explanation:
v = v₀ + a t accelerated movement
v = v₀ - a t slow movement
God is with you!!!
<span>The force will be zero if the wagons are moving at a constant speed (i.e. not accelerating), as there is no frictional force to overcome. If the wagons are accelerating, the force will be proportional to the acceleration, and 20% of the force applied by A.</span>
Mechanical Advantage is the value which tells us the factor by which the machine is able to convert the force applied to it to its output.
Ideal Mechanical Advantage of wheel and axle is calculated by
IMA = Wheel Radius / Axle Radius
By virtue, the higher the computed IMA the lower the force needed to be exerted, this is the purpose for using machine, lower input force but larger output. (The smalled the axle radius compared to the wheel radius is the better setup.)
Work is equal to the force applied times the displacement. Since you pull the wagon at constant speed this means that there is no acceleration on the wagon as it does not change speed. F=ma. Since a=0, F=0. Therefore no work has been done in this situation
