Calculation of gravitational force - JSS1 Basic science Past Questions and Answers - page 2

Force is a push or pull that can change the state of motion of an object. It can cause an object to start moving, stop moving, or change direction.

Balanced forces are equal in magnitude and opposite in direction, resulting in no change in motion. Unbalanced forces are unequal in magnitude, causing a change in an object's motion.

Friction is the resistance force that opposes motion when two surfaces are in contact with each other. It is crucial for walking, driving vehicles, writing with a pen, and many other everyday activities.

One advantage of friction is that it helps to prevent slipping and allows us to grip objects. However, a disadvantage is that it can cause wear and tear on surfaces, reduce efficiency in machines, and create heat, leading to energy loss.

Newton's law of universal gravitation can be used to calculate gravitational force. It states that every mass attracts every other mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.