Forces and Machines

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Forces everywhere

Forces are actions which make objects move, stop, or change shape. They can be a push or a pull. When you throw a ball, it moves. The movement is caused by the force you applied to the ball.

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Types of forces

Gravity: this force makes objects fall to the ground. If we throw an object into the air, gravity pulls it to the ground. Electric force: This force is found between electrically charged objects. Electric force can attract or repel. Magnetic force: This force affects magnets and some metallic objects. Magnetic force can attract or repel. Friction: When an object touches another object, it experiences a frictional force. This force acts in the directions opposite to the direction of movement. It slows or stops moving objects. For example, friction between a ball and the ground stops the ball rolling after a few meters.

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Forces and movement Force is the push or pull applied on an object. It can move a stationary object or stop a moving object. Force can also change the speed and direction of a moving object. If enough force is applied, it can also change the shape or size of an object. When force is applied on an object, resulting in the movement of that object, work is said to be done. Work can be calculated using the formula, Work done = Force x Distance. The ability or the capacity to do work is called energy. The food that we eat gives us energy to do various activities.

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Remember

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Self-evaluation

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