C-10 — Let Us Know Force

What is force?

According to Newton's first law of motion, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless—

Who published the three laws of motion?

In our daily experience, a moving object eventually stops because of—

To change the state of motion of an object, we must apply—

Which of the following actions does NOT involve application of force?

From Newton's first law of motion, we obtain the concept of—

The tendency of an object to remain in its present state until force is applied is called—

The tendency of an object at rest to remain at rest is called—

The tendency of an object in motion to continue its uniform motion is called—

When a stopped bus suddenly starts moving, the passengers lean—

When a passenger gets down from a running bus and stumbles forward, it is because—

In the coin-card experiment, when the card is tapped hard, the coin drops into the glass because—

The main purpose of wearing seat belts in a car is to protect passengers from the danger of—

When a moving bus suddenly takes a turn, the passengers lean towards the opposite direction because—

The measure of the amount of inertia of an object is its—

The more the mass of an object, the more force is needed to—

Consider the following examples:

Momentum is the product of—

If mass is $m$ and velocity is $v$, the momentum $p$ of the object is—

If the velocity of an object of mass $m$ changes from $u$ to $v$ without change of mass, the change of momentum is—

Acceleration is defined as—

If the velocity of an object changes from $u$ to $v$ over time $t$, the acceleration $a$ is—

Newton's second law of motion states that the rate of change of momentum of a body is—

The mathematical form of Newton's second law of motion is—

The SI unit of force is—

One Newton is the force required to accelerate a mass of—

The mass of an object is 20 kg. A force is applied that produces an acceleration of $2\ \text{m/s}^2$. What is the value of the force?

A force of 50 N is applied on an object of mass 10 kg. The acceleration produced is—

To produce the same acceleration in two objects of different masses, the object with greater mass requires—

Newton's third law of motion states that to every action force there is—

Action and reaction forces always act on—

If the action force ceases, the reaction force—

When we walk forward, the ground pushes us forward because—

It is difficult to walk on a rough floor made slippery with soap water because—

A boatman pushes the river-bed with a bamboo stick and the boat moves forward. This is an example of—

When an inflated balloon is suddenly released, it flies in the direction—

When you jump while standing on a weighing machine, the indicator shows more weight for a moment because—

A book hangs at rest from an extended rubber band. The book is in static position because—

Consider the following statements about action–reaction forces:

How many fundamental forces are there in nature?

Which of the following is NOT a fundamental force in nature?

The force by which every object having mass attracts every other object is called—

The gravitational pull of the earth on objects on its surface is called—

Electricity and magnetism—

Electromagnetic force is approximately how many times stronger than gravitational force?

The weak nuclear force is responsible for—

The weak nuclear force works within a very short distance of about—

The strongest force in the cosmic universe is—

The strong nuclear force is approximately how many times stronger than the electromagnetic force?

The strong nuclear force acts on—

The light and heat that we obtain from the sun is essentially a product of—

Scientists have already unified which two fundamental forces under a single formula?

Consider the following forces:

Frictional force always acts—

Friction between two surfaces is created mainly because—

If a heavy weight is placed on a wooden piece resting on a table, the friction between the wood and the table—

Friction generates—

The engine of a car is cooled because—

How many types of friction are there?

The frictional force that develops when two objects are at rest relative to each other is called—

The frictional force that develops when an object is in motion relative to another object is called—

When the brake of a cycle presses against the rotating wheel and stops it, the friction involved is—

Kinetic friction on an object depends on—

When an object moves by rolling or revolving on a surface, the friction developed is called—

Among all types of friction, the least is—

Wheels are attached to suitcases to make pulling easier by utilizing—

The frictional force experienced by an object when it moves through a liquid or gaseous medium is called—

A person can land safely on the ground using a parachute because of—

We are able to walk on the ground without slipping because of—

The maximum static friction between two surfaces is—

Which of the following is used as a lubricant to reduce friction?

Ball bearings in a rotating wheel reduce friction by replacing—

The streamline design of fast vehicles such as cars and aeroplanes is intended to—

To increase friction between a vehicle tyre and the road, one common method is—

To rescue a truck stuck in mud, the friction between wheel and mud—

Consider the following methods:

Consider the following methods:

Friction is called a "necessary nuisance" because—

In winter, we rub our hands together to feel warm. This warmth is due to—

Which of the following would be impossible without friction?

A fruit falls on the ground from a tree — example of which type of force is it?

A characteristic of force is that it—

A stationary object on the floor was acted upon by a 2-Newton force, resulting in an acceleration of $4\ \text{m/s}^2$. What is the mass of the object?

A stationary object on the floor was acted upon by a 2-Newton force, resulting in an acceleration of $4\ \text{m/s}^2$. When the force was removed, the object moved a short distance and then stopped. Which force caused the object to stop?

A bus of mass 1400 kg accelerates at $4\ \text{m/s}^2$. The force acting on the bus is—

When the driver of a moving bus suddenly hits the brakes, passengers lean forward because—

Why does a moving fan not stop immediately when the electricity is turned off?

Turjo sits on a chair and tries to pull a heavy table towards him, but instead he and his chair move towards the table. This happens because—

On a smooth floor, a wooden ball and an iron ball of the same size are rolled with the same force. The iron ball travels a greater distance because—

Why does dust fall off when a hanging blanket is hit with a stick?

Why does a gun recoil backward when a bullet is fired?

Why do we slip while walking on muddy ground?

Why is it possible to land safely on the ground when jumping from an aeroplane with a parachute?