The direction we push and the direction the book moves need not be the same. Consider a book on a train. We push the book rearward relative to the moving train. The book moves forward relative to the ground and the work we perform relative to the ground frame is negative.manogyana25 said:When a book which is on table is pushed, it moves in the direction we push and the work done by us is positive and the energy gained by the body is also positive.
The force of friction on that book is in the forward direction. The book is moving in the forward direction relative to the ground. Relative to the ground, the work done by friction was positive.But consider the frictional force. The work done by it is negative.
Yes, force is also relative like motion. This means that the amount of force acting on an object can vary depending on the observer's frame of reference.
When we say that force is relative, it means that its measurement and effects can change depending on the observer's perspective. This is similar to how we perceive motion, which can appear different depending on our frame of reference.
The concept of relativity in force helps us to understand that the forces acting on an object can vary depending on the observer's point of view. This is important in fields such as physics and engineering, as it allows us to accurately calculate and predict the effects of forces in different scenarios.
Yes, there are many real-life examples of relative force. One example is when you are on a moving train and you throw a ball in the air. To you, the ball appears to travel in a straight line, but to an observer standing outside the train, the ball appears to follow a curved path due to the train's motion.
We can measure relative force by using a reference point or frame of reference. This is a fixed point or object that we use to compare the forces acting on an object. By using different frames of reference, we can measure the relative forces acting on an object and determine their effects.