Understanding Balanced and Unbalanced Forces

The video tutorial explains the concepts of balanced and unbalanced forces using various examples. It begins with a book resting on a surface, illustrating balanced forces with gravity and normal force. The tutorial then discusses net force and acceleration, highlighting Newton's laws. Examples include a block with applied force and friction, a ball in free fall, and a parachute reaching terminal velocity. Each scenario demonstrates how forces interact to create balanced or unbalanced situations, affecting motion and acceleration.

What are the forces acting on a book resting on a horizontal surface?

• Frictional force and gravitational force

• Only gravitational force

• Gravitational force and normal force

• Only normal force

According to Newton's third law, what is the reaction force to the gravitational force on the book?

• Normal force

• Applied force

• Frictional force

• Tension force

What happens to an object when the forces acting on it are unbalanced?

• It accelerates

• It moves at constant speed

• It remains at rest

• It decelerates

If a block is moving at constant speed, what can be inferred about the forces acting on it?

• The block is accelerating

• The forces are balanced

• There is no friction

• The forces are unbalanced

What type of friction acts on a block sliding at constant speed?

• No friction

• Kinetic friction

• Static friction

• Rolling friction

When a ball is in free fall, what is the dominant force acting on it?

• Frictional force

• Gravitational force

• Normal force

• Air resistance

What happens to the forces acting on a person when they reach terminal velocity?

• The forces become unbalanced

• The forces remain unbalanced

• The forces become balanced

• The forces disappear

At terminal velocity, what is the net force acting on the person?

• Greater than zero

• Less than zero

• Equal to zero

• Equal to gravitational force

What role does air resistance play when a person reaches terminal velocity?

• It increases continuously

• It decreases continuously

• It balances the gravitational force

• It has no effect

What is the state of motion of an object when the forces acting on it are balanced?

• It moves at constant velocity

• It changes direction

• It decelerates

• It accelerates