A block of mass 1 kg is pushed up a surface inclined to horizontal at an angle of 60° by a force of 10 N parallel to the inclined surface as shown in the figure. When the block is pushed up by 10 m along the inclined surface, the work done against frictional force is:
The work done against the frictional force can be calculated using the formula:
Where:
- (the coefficient of kinetic friction),
- (the normal force),
- (the distance moved along the inclined plane).
First, we find the normal force:
Now we can calculate the work done against friction:
The torque of a force about the origin is τ. If the force acts on a particle whose position vector is, then the value of τ will be
Different types of forces that are found in nature can be broadly categorized into two types:
Contact Forces can further be divided into the following types:
Action-at-a-Distance Force is exerted without the objects being in contact. The various types of Action-at-a-Distance Force are as follows: