U4Q2 Newton's Second Law, Weight and Drag

Front

What is Newton's Second Law of Motion?

Back

Newton's Second Law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be expressed with the formula F = ma, where F is the net force, m is the mass, and a is the acceleration.

Front

What is net force?

Back

Net force is the vector sum of all the forces acting on an object. It determines the object's acceleration and direction of motion.

Front

How does weight differ from mass?

Back

Weight is the force exerted by gravity on an object, calculated as W = mg, where m is mass and g is the acceleration due to gravity. Mass is a measure of the amount of matter in an object and does not change regardless of location.

Front

What is drag force?

Back

Drag force is the resistance force experienced by an object moving through a fluid (liquid or gas). It opposes the motion of the object and depends on the object's speed, shape, and the properties of the fluid.

Front

What happens to the weight of an object in an accelerating elevator?

Back

If an elevator accelerates upward, the scale reading increases (weight appears greater). If it accelerates downward, the scale reading decreases (weight appears less). If moving at constant speed, the weight remains the same.

Front

How do you calculate mass using force and acceleration?

Back

Mass can be calculated using the formula m = F/a, where F is the net force applied to the object and a is the acceleration produced.

Front

What is the relationship between force, mass, and acceleration?

Back

The relationship is defined by Newton's Second Law: the net force acting on an object is equal to the mass of the object multiplied by its acceleration (F = ma).

Front

What is the effect of increasing mass on acceleration for a constant force?

Back

Increasing the mass of an object while keeping the force constant will result in a decrease in acceleration, as acceleration is inversely proportional to mass.

Front

What is the significance of the direction of net force?

Back

The direction of the net force determines the direction of the object's acceleration. An object will accelerate in the direction of the net force acting on it.

Front

How does drag force affect the motion of a falling object?

Back

As a falling object accelerates, drag force increases until it equals the weight of the object, resulting in terminal velocity where the object falls at a constant speed.