PART 1 FORCE FORCE EFFECTS OF FORCE It

PART 1 FORCE

FORCE EFFECTS OF FORCE: It can bring a stationary body into motion. It can stop a moving body. It can change the direction of a moving body. It can change the shape and size of a body. It can change the speed of a moving body.

MOTION OF A BODY: EFFECT OF FORCE Motion can be classified in different types. The two important types of motion are: Translational motion and Rotational motion

ROTATIONAL MOTION The motion of a body that spins about an axis is called ROTATIONAL MOTION. The forces which bring rotation of a body about an axis without any translational motion are called turning forces. The body rotates because of the torque it experiences due to these turning forces.

MOMENT OF A FORCE : TORQUE

EXAMPLES OF TURNING EFFECT OF FORCE: OPENING OR CLOSING A DOOR, STEERING WHEEL The perpendicular distance from the axis of rotation is the radius of the steering wheel and hence is fixed. The left and the right hand apply equal and opposite forces on the wheel.

BICYCLE PEDAL AND WRENCH A small force is applied at the pedal, which is at a large distance from the axle. As the pedal and the toothed wheel turn through one revolution, the pedal moves further. Force applied to the chain is greater than the force applied to the pedal. A wrench is used to tighten or loosen nuts. It has long handle and the force is applied at the end which increases the turning effect.

FACTORS ON WHICH THE TURNING EFFECT OF FORCE DEPENDS The size of the force The perpendicular(shortest) distance between the line of action of the force and the axis of rotation. Moment = F × r

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