Forces on Inclined Planes

This video tutorial continues the discussion on friction, focusing on the angle of repose and its relationship with the coefficient of friction. The lecture explains the forces acting on a body on an inclined plane, including the normal force and frictional force. It introduces key equations such as mu = tan alpha and links these concepts to the previous lecture. The tutorial concludes by emphasizing the conditions under which a body will start to slide down an inclined plane.

What is the primary focus of the sixth lecture in the series?

• Normal force

• Angle of repose

• Coefficient of friction

• Inclined plane

What is the angle between the horizontal surface and the inclined plane called?

• Inclination angle

• Alpha

• Angle of repose

• Angle of friction

Which force component acts parallel to the inclined plane?

• W cos alpha

• W sine alpha

• Normal force

• Frictional force

What happens when the angle of inclination increases to a certain point?

• The frictional force increases

• The normal force decreases

• The body starts to slide down

• The body remains stationary

What is the angle at which a body starts to slide down an inclined plane called?

• Angle of friction

• Sliding angle

• Critical angle

• Angle of repose

How is the normal force on an inclined plane calculated?

• N = W sine alpha

• N = W cos alpha

• N = W tan alpha

• N = W

What is the relationship between the frictional force and the weight component parallel to the plane?

• F = W

• F = W tan alpha

• F = W sine alpha

• F = W cos alpha

What equation represents the coefficient of friction in terms of angle alpha?

• Mu = cos alpha

• Mu = alpha

• Mu = sin alpha

• Mu = tan alpha

When does the angle of repose equal the angle of friction?

• When the normal force is maximum

• When the frictional force is zero

• When the body starts to slide

• When the body is stationary

What condition must be met for a body to start sliding down an inclined plane?

• Alpha equals phi

• Alpha is zero

• Alpha is less than phi

• Alpha is greater than phi