Match the following Column A Column B 1. Steering wheel (a) turning effect of force 2. Siphon (b) forces are applied tangentially 3. Rotatory motion (c) motion along a straight line 4. Translatory motion (d) without complete displacement of body 5. Torque (e) inverted U-shaped tube

1-(a), In steering wheel the turning effect is maximum when the forces are applied tangentially to the wheel. If the two forces are applied in any other direction the perpendicular distance between the axis and the force becomes less and hence torque decreases. 2-(e), A siphon works on the phenomenon of atmospheric pressure, is a very simple arrangement that can be used for emptying a liquid from fixed vessels. 3-(d), The rotational motion is one in which one end of the body is fixed and motion takes place about an axis of rotation. When we pedal a bicycle resting on its stand, the crank and the wheel rotate, this shows the phenomenon of rotational motion. The force applied on the pedal has a turning effect on the wheel. 4-(c), We know that when sufficient force is applied on a stationary rigid body it begins to move in a straight line along the direction of force, this motion of the body is called translatory motion. In this type of motion, the whole body is displaced. 5-(b). The turning effect of a force is measured in terms of a physical quantity which is known as torque or moment of force. Column A Column B 1. Steering wheel (a) turning effect of force 2. Siphon (e) inverted U-shaped tube 3. Rotatory motion (d) without complete displacement of body 4. Translatory motion (c) motion along a straight line 5. Torque (b) forces are applied tangentially

Define moment of a force.

Moment of force on a rigid body is defined as the product of the magnitude of the force and its perpendicular distance from the axis of rotation of the body. It can be act in clockwise or anticlockwise directions.

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New Trends in ICSE Physics 8>Chapter 3 - Force and Pressure>EXERCISES>Q 4

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In bicycle pedal, force applied to the chain is greater than the force applied to the pedal.

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Important Questions on Force and Pressure

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New Trends in ICSE Physics 8>Chapter 3 - Force and Pressure>EXERCISES>Q 5

Pressure can be reduced by distribution of weight.

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New Trends in ICSE Physics 8>Chapter 3 - Force and Pressure>EXERCISES>Q 1

Choose the odd one out by giving the reason: Door, bicycle pedal, moving car, wrench.

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New Trends in ICSE Physics 8>Chapter 3 - Force and Pressure>EXERCISES>Q 2

Choose the odd one out by giving reason: Rubber sucker, Drinking straw, Siphon, Bicycle pedal.

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New Trends in ICSE Physics 8>Chapter 3 - Force and Pressure>EXERCISES>Q 3

Choose the odd one out by giving reason: Force, Thrust, Pressure.

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New Trends in ICSE Physics 8>Chapter 3 - Force and Pressure>EXERCISES>Q 4

Choose the odd one out by giving reason: The door, Steering wheel, Wrench, Siphon, Bicycle pedal.

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New Trends in ICSE Physics 8>Chapter 3 - Force and Pressure>EXERCISES>Q 1

Match the following

Column A	Column B
1. Steering wheel	(a) turning effect of force
2. Siphon	(b) forces are applied tangentially
3. Rotatory motion	(c) motion along a straight line
4. Translatory motion	(d) without complete displacement of body
5. Torque	(e) inverted U-shaped tube