1. What is necessary to move an object from one side of a room to the other side of the room? (Choose all that apply).
Answers
You have learnt how objects move. 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. 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. In all these situations the ball is either made to move faster or slower or its direction of motion is changed.
To move a ball or any other object from one side of the room to the other side we require multiple physical entities, they are:
- Force - Force refers to that physical quantity that changes the motion of an object. In this case, to move the ball from one side of the room to another we need to apply some force to the ball so that it can move. Similarly, when the ball reaches the end of the room some force is applied to stop it.
- Energy - To move the ball to the other side of the room we definitely require some force. When the force is applied, some energy is also consumed while applying the force.
- Power - We definitely require some power to apply the force on the ball so that it can move from one side of the room to another.
Hence we can say that to move the ball from one side of the room to another we require force, energy, and power.