Chapter Unit - 1 : Force, Work, Energy and Power - Turning Effect of Force and Equilibrium - Frank Solutions for Class 10 Physics ICSE
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Chapter 1 - Force, Work, Energy and Power - Turning Effect of Force and Equilibrium Excercise 21
Moment of a force = Force x perpendicular distance of the pivot from the force.
Its SI unit is newton-metre (Nm).
e.g. the motion of a bullet fired from a gun, a ball thrown straight up and falling back straight down.
e.g. Earth's rotation about its axis, wheels of car in motion.
1. The magnitude of force applied.
2. The distance of the line of action of the force from the axis of rotation.
If the turning effect on the body is anticlockwise, moment of force is called the anticlockwise moment and is taken as positive.
(i) linear motion.
(ii) rotational motion, in a body.
(ii) If a rigid body moves around a center or is pivoted at a point, the applied force will cause rotational motion.
Equilibrium is a state of zero acceleration.
(a) The sum of the (vector) forces must equal zero, i.e. ? F = 0
(b) The sum of the torques must equal zero; i.e. ? ? = 0.
(ii) The conditions for dynamic equilibrium are:
(a) The body should have a broad base.
(b) Centre of gravity of the body should be as low as possible.
(c) Vertical line drawn from the centre of gravity should fall within the base of the support.
Static equilibrium: a box at rest on a floor; there is a gravitational force pulling the object to the earth, but there is also an equal and opposite force applied by the floor to the box (pushing up).
Dynamic equilibrium: A rock travelling across the cosmos, far enough away from any other object (so as not to be affected by gravity - in other words, in zero gravity conditions); the rock continues to travel in a straight line at uniform velocity either for eternity, or until acted upon by an external unbalanced force.
(a) Vector sum of forces acting on the body should be zero.
(b) Algebraic sum of moments acting on the body should be zero.
(i) Opening and closing the cap of a bottle
(ii) Turning a key in a lock
(ii) Force 'P' has the maximum moment about 'O' because its perpendicular distance is maximum from 'O'.
Chapter 1 - Force, Work, Energy and Power - Turning Effect of Force and Equilibrium Excercise 22
Effect of couple: It produces angular acceleration.
Moment of couple= Force x Couple arm.
Its SI unit is Nm.
State the conditions of equilibrium for a rigid body.
Conditions of equilibrium for a rigid body:
1. The body should have a broad base.
2. Center of gravity of the body should be as low as possible.
3. Vertical line drawn from the center of gravity should fall within the base of
4. Vector sum of forces acting on the body should be zero.
5. Algebraic sum of moments acting on the body should be zero.
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