Dinamika Benda Kaku Gaya & Percepatan

Force, Mass and Acceleration

Examples

 Example 17.1

Determine the moment of inertia of the cylinder about the axis. The density of the material is constant.

 Example 17.2

A solid id formed by revolving the shaded area about the y axis. If the density of material is 5Mg/m³, determine the moment of inertia about the y axis.

Equations of Motion: Translation

Example 17.5

The car has a mass of 2Mg and center of mass at G. Determine the car's acceleration if the "driving" wheels in the back are always slipping, whereas the front wheel freely rotate. Neglect the mass of the wheels. The coefficient of kinetic fiction between the wheels and the road is 0,25.

Solution 1

v  The rear wheel frictional force pushes the car forward, and since slipping occurs, F_B = 0,25 NB

v  Frictional forces acting on the front wheels = 0 m, since these wheels have negligible mass

v  Car (point G) is assumed to acceleration to the left in the negative x direction.

Solution 2

v  Apply moment equation at point A, unknown N_A will be eliminated from the equation

v  Use the kinetic diagram o visualize the moment at A