Advertisements
Advertisements
Question
The adjacent diagram shows a heavy roller, with its axle at O, which is to be raised on a pavement XY. If there is friction between the roller and pavement, show by an arrow on the diagram the point of application and the direction of force to be applied. If pivoted at O, now will it go up?
Advertisements
Solution
The force should be applied at the topmost point of the roller. The direction of the force should be perpendicular to the axle O and upward at an angle, to generate torque. If the roller is pivoted at O, it will not go up because the applied force at O does not generate enough torque to lift the roller against gravity and friction.
APPEARS IN
RELATED QUESTIONS
A spring is compressed against a rigid wall. Draw a neat and labelled diagram showing the forces acting on the spring.
Define Newton (the S.I unit of force)
Explain what is understood by the following statement 1 kilogram-force (kgf) - 9.8 newton
Complete the following
1 N = ..........dyne.
Complete the following:
1 N = ............kgf (approx)
A body is acted upon by two forces of magnitude F, but in opposite directions. State the effect of the force if the two forces act at two different points of the body at a separation r.
Fill in the empty spaces
Can you give example for contact and non-contact forces?
Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?
The moon attracts Earth with a force of 1020 N, and then the force with which the Earth attracts the moon is ______.
Write true and false.
If mass increases, force decreases.
