Match the items in column I with the correct choices in column II. Column I Column II 1. The force acting due to the earth on a body muscular force 2. A man pulling a bucket of water out of a well gravitational force 3. The force exerted by a cricket bat on the ball impact forces 4. A boy pulling at the rope tied to the collar of his goat the difference of two forces 5. The resultant of the two forces acting in the opposite direction change in direction of motion

Every object in the earth is attracted towards its centre by a force called gravitational force which is a non-contact force. The earth exerts this force on all the bodies within the gravity region of the earth. This gravitational force with which the earth attracts a body towards its centre is also called its weight. Drawing out of water from a well is an example of a muscular force, as it requires much more energy and acceleration to overcome the gravitational pull of the earth. It involves the muscle strength of the humans to draw out water from the well. This force is a contact force as the action requires a connection with humans. A ball that is thrown by a bowler in a particular direction causes a change in direction when it is stricken by a batsman because it causes an external force to act on the ball bringing about a change in its path. Thus, there occurs a change in direction of motion of ball. By applying external forces, the state of a body can be changed. The force applied to move a stationary object or to stop a moving object are some effects of force and these changes are due to the impact of external force applied. Thus, a boy pulling the rope tied to the collar of his goat tends to bring about some change as an impact of this pulling force. When two forces are acting on a body, the total effect of all these forces together acts as a single force. When the forces are applied in the opposite direction, the resultant of the two forces acting in different direction will be the differences between the two forces. Hence, Resultant Force ( A - B ) = Force ( A ) - Force ( B ) Column I Column II 1. The force acting due to the earth on a body gravitational force 2. A man pulling a bucket of water out of a well muscular force 3. The force exerted by a cricket bat on the ball change in direction of motion 4. A boy pulling at the rope tied to the collar of his goat impact forces 5.The resultant force of the two force acting in the opposite direction the difference of two forces

E M B I B E

Its All About Science Physics For Middle School 6>Chapter 3 - Force>EXERCISE>Q B

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The friction always acts in the (same/opposite) direction of the movement of the object.

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Important Questions on Force

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Its All About Science Physics For Middle School 6>Chapter 3 - Force>EXERCISE>Q B

The maximum value of friction is called _____ friction.

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Its All About Science Physics For Middle School 6>Chapter 3 - Force>EXERCISE>Q B

In machines ball bearings and roller bearings are used to _____ (reduce/increase) friction.

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Its All About Science Physics For Middle School 6>Chapter 3 - Force>EXERCISE>Q B

The spring balance is used to measure _____.(Distance/Weight)

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Its All About Science Physics For Middle School 6>Chapter 3 - Force>EXERCISE>Q B

Rolling friction is much less than the _____ friction. (Sliding/ force of friction)

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Its All About Science Physics For Middle School 6>Chapter 3 - Force>EXERCISE>Q C

Match the items in column I with the correct choices in column II.

Column I	Column II
1. The force acting due to the earth on a body	muscular force
2. A man pulling a bucket of water out of a well	gravitational force
3. The force exerted by a cricket bat on the ball	impact forces
4. A boy pulling at the rope tied to the collar of his goat	the difference of two forces
5. The resultant of the two forces acting in the opposite direction	change in direction of motion