9702 · 3.2
Non-uniform motion — FAQ
Frequently asked questions for 9702 Non-uniform motion. Direct answers first, then deeper explanation — then practise with marking.
What causes an object to experience non-uniform motion?
Non-uniform motion is always caused by a resultant (net) force acting on an object. This unbalanced force leads to a change in the object's velocity, either in magnitude (speed) or direction, or both.
How do Newton's Laws of Motion explain non-uniform motion?
Newton's First Law states that a resultant force is necessary for any change in motion. His Second Law, , quantifies this, showing that the resultant force directly determines the object's acceleration (change in velocity) inversely with its mass. Newton's Third Law describes the interactive forces that create these resultant forces on objects.
Why is terminal velocity important in the study of non-uniform motion?
Terminal velocity represents a crucial transition in non-uniform motion. While an object initially accelerates due to a resultant force, the increasing resistive forces eventually balance the driving forces. This results in zero net force, zero acceleration, and the object transitioning from non-uniform to uniform motion at its maximum constant speed.