Question

A dynamic cart has a mass of 875g. it is connected to a suspended 300g mass by a string that is threaded through a frictionless pulley. The coefficient of friction between the lab desk and the dynamics cart is 0.25. determine the acceleration of the dynamic

Answer 1

Explanation:

With Newton’s Laws we begin the study of how motion occurs in the real world. The study

of the causes of motion is called dynamics, or mechanics. The relation between force

and acceleration was given by Isaac Newton in his three laws of motion, which form the

basis of elementary physics. Though Newton’s formulation of physics had to be replaced

later on to deal with motion at speeds comparable to the speed light and for motion on the

scale of atoms, it is applicable to everyday situations and is still the best introduction to

the fundamental laws of nature. The study of Newton’s laws and their implications is often

called Newtonian or classical mechanics.

Particles accelerate because they are being acted on by forces. In the absence of forces,

a particle will not accelerate, that is, it will move at constant velocity.

The user–friendly way of stating Newton’s First Law is:

Consider a body on which no force is acting. Then if it is at rest it

will remain at rest, and if it is moving with constant velocity it will

continue to move at that velocity.

Forces serve to change the velocity of an object, not to maintain its motion (contrary to

the ideas of philosophers in ancient times).

4.1.2 Newton’s Second Law

Experiments show that objects have a property called mass which measures how their motion

is influenced by forces. Mass is measured in kilograms in the SI system.

Newton’s Second Law is a relation between the net force (F) acting on a mass m and

its acceleration a. It says:

P

F = ma