Question

write a summary of force and pressure lesson for grade 8th​

Answer 1

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Force:

• Force is a push or a pull.
• Living and non- living things can apply force.
• To apply a force over an object interaction between object and source of force is necessary.
• Whenever force act two object are involved. One which applied force, the other which receive force.

Examples: To kick ball we need to push it, to pick the book we need to pull it, to hit the ball we need to push it and to lift the box we need to push it.

Direction and Magnitude of Force:

• The measurement of strength and amount of force is called magnitude of force.
• Two or more forces on the same object can be applied in the same direction and opposite direction.

1. When two or more forces are applied over an object in the same direction:

When two or more forces are applied in the same direction, then the total or net force is the addition of magnitude of both the forces.

Example: When two persons push the box in the same direction with the magnitude of forces of each 2 N, then resultant force will be-

Net force:- 2N + 2N= 4N (In the direction of applied force)

2. When two forces are applied over an object in the opposite direction:

When two forces are applied over an object in the opposite directions, the total effective or net force is the difference of magnitude of two forces.

Example:

• When two persons push the box in the opposite direction with the magnitude of forces of each 2 N, then resultant force will be-

• Net force:- 2N - 2N= 0N (Box will not move)

• If one person is applying a force of 6 unit in one direction and another person is applying a force of 8 unit in opposite direction,

• Then the resultant force: 8N - 6N= 2N (In the direction of higher magnitude force)

• In this case, force will act in the direction of higher magnitude of force.

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