Describe an activity to show that a force can change the state of motion.......
Answers
Answer:
In Class VII, you have learnt how objects move. Do you recall how we can decide whether an object is moving faster than the other? What does the distance moved by an object in unit time indicate? You also know that a moving object like a ball rolling on the ground slows down. Sometimes it may change its direction of motion.It is also possible that the ball may slow down and also change its direction. Did you ever wonder what makes an object to slow down or go faster, or change its direction of motion?
Let us recall some of our everyday experiences. What do you do to make a football move? What do you do to make a moving ball move faster? How does a goalkeeper stop a ball? How do fielders stop a ball hit by a batsman? A hockey player changes the direction of the moving ball with a flick of the stick (Fig. 11.1). In all these situations the ball is either made to move faster or slower or its direction of motion is changed.
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Explanation:
Force Can Cause Motion and Acceleration:
There are countless real-life examples of force leading to motion. When you kick a stationary ball. Through your feet, you apply a force to it that causes the ball to start moving. However, this is not the only effect, force can also cause an increase in movement if it is applied in the same direction as the body is moving. For example, if you are riding a bike and you are already in motion, by pedaling
you use power even more efficiently to increase the speed you travel. This is an example of using a force to accelerate or speed up. We should remember that acceleration occurs only while the force is acting. If the force is removed, the acceleration stops.
Force can cause Deceleration or stop Motion
Brakes are an extremely important part of a vehicle. Can you imagine how dangerous your cycle would be if you couldn't slow down in an accident? Fortunately, the force comes to the rescue again. A force can also sometimes cause motion to stop, or in other words cause it to slow down. Brakes use the force you used to slow or stop the vehicle. If you throw the ball at a given speed, it will slow down as it moves upward due to the force of gravity.
Force Can Cause a Change in the Direction
do you play cricket Cricket and almost all other sports rely on force to change the direction of the ball. The bowler bowls the ball towards the batsman, but upon contact with the bat, the ball takes a completely different path. This is because the batsman applies force to the ball to change the direction of the ball. The steering wheel of your car works in a similar way. By applying force to turn the wheel, you change the direction your car is moving. To summarize, a force is a pressure, pull, or drag on an object that affects the object's state of motion. A force can also cause a combination of the above effects, it can both speed up/slow down and change the direction of an object's motion. Force in real life most often affects both speed and direction of movement. The application of a force can cause an object to accelerate, decelerate, stop, or change direction.
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