When a carpet is beaten with a stick, dust comes out of it, Explain

When a balloon is inflated and then released, it flies around. This phenomenon is best explained by:

A car moves at a constant speed on a straight road. What can be concluded about the forces acting on the car?

The mass of an object is 10 kg. What is its weight on Earth (g = 9.8 m/s²)?

Which of the following forces is responsible for making objects fall to the Earth?

A force of 10 N acts on an object, causing it to accelerate at 2 m/s². What would be the acceleration if a force of 20 N acted on the same object?

According to the second law of motion, an object will accelerate when:

If an object is moving at a constant speed in a circular path, its velocity is:

A pitcher throws a baseball. As the ball leaves the pitcher's hand, it has a certain momentum. Which force primarily acts to change this momentum later?

A book lying on a table is an example of:

Why are seatbelts essential in cars?

A force of 50 N acts on a body for 0.5 s. What is the impulse produced?

What is the relationship between impulse and momentum?

The force required to change the state of motion of an object is called:

Which concept was first introduced by Galileo Galilei?

When you throw a ball upwards, what happens to its momentum as it goes up?

If the velocity of an object is constant, then its acceleration is:

A fisherman tries to push his boat away from the bank. He applies force on the bank and the boat moves away. This is an example of:

Which of the following statements is incorrect?

When a force is applied to an object, its momentum changes from p1 to p2 over a time interval t. The force applied is:

A heavy object has more inertia than a light object because it has:

The SI unit of momentum is also equivalent to:

A passenger is sitting in a bus. When the bus driver applies the brakes suddenly, the passenger tends to fall forward. This is due to:

What is the momentum of a stationary object?

In the absence of air resistance, a feather and a stone dropped from the same height will:

The unit of mass is:

If an object experiences a net force, it will:

The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called:

Which statement is true for action and reaction forces?

A cart of mass M is moving with velocity V. If a mass m is added to the cart, the new velocity of the cart will be:

Newton's First Law defines:

Which of the following would require the largest force to accelerate?

When a car takes a sharp turn, passengers are thrown sideways due to:

The change in momentum of an object is equal to the:

A force of 20 N produces an acceleration of 4 m/s² in an object. What is the mass of the object?

What is the unit of impulse?

When you push against a wall, the wall pushes back on you with an equal and opposite force. This illustrates:

The principle of conservation of momentum applies to:

An object is said to have uniform velocity if it covers:

A fielder catching a fast-moving cricket ball often moves his hands backward with the ball. This is done to:

The formula for momentum is:

Which of the following is a non-contact force?

In an isolated system, two objects collide. Which of the following is true?

Galileo's experiment on the inclination of planes suggested that:

A force can change the:

What is the momentum of a 10 kg object moving with a velocity of 5 m/s?

A body of mass 5 kg is accelerated by a force of 20 N. The acceleration produced is:

A boy jumps out of a moving boat. What happens to the boat?

The property of matter that defines its resistance to changes in motion is:

If the mass of an object is doubled, its inertia will:

A force of 10 N acts on an object of mass 2 kg. What is the acceleration produced?

Which of the following is not a consequence of Newton's Third Law?

Impulse is defined as:

A rocket works on the principle of:

If an object is moving with constant velocity, the net force acting on it is:

What is the S.I. unit of acceleration?

A passenger standing in a bus falls backward when the bus starts suddenly. This illustrates:

The force which opposes the relative motion between two surfaces in contact is called:

A cricketer pulls his hands back while catching a ball. This helps to:

The rate of change of momentum of an object is proportional to the:

If no external force acts on a system, its momentum remains:

Action and reaction forces:

A hockey player hits a ball towards the goal. The ball continues to move towards the goal even after the stick is removed. This is due to:

Which of the following has the most inertia?

The law of conservation of momentum states that:

A body is said to be in uniform motion if it travels:

What is the approximate value of 1 Newton?

The force of friction always acts:

When a car suddenly stops, passengers tend to lean forward due to:

An object of mass 'm' moving with velocity 'v' has momentum 'p'. If the velocity is doubled, its momentum will be:

According to Newton's Second Law of Motion, Force is equal to:

Which of the following quantities is a vector quantity?

A bullet fired from a gun experiences a recoil. This is an example of:

The S.I. unit of momentum is:

If a net force acts on an object, the object will:

Newton's First Law of Motion is also known as:

The tendency of an object to resist a change in its state of motion is called:

A balanced force results in:

Which of the following is an example of a contact force?

What is the S.I. unit of force?

How much momentum will a dumb-bell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration as 10 m/s².

Akhtar, Kiran and Rahul were riding in a motorcar that was moving with a high velocity on an expressway when an insect hit the windshield and got stuck on the windscreen. Akhtar and Kiran started pondering over the situation. Kiran suggested that the insect suffered a greater change in momentum as compared to the change in momentum of the motorcar (because the change in the velocity of the insect was much more than that of the motorcar). Akhtar said that since the motorcar was moving with a larger velocity, it exerted a larger force on the insect. And as a result the insect died. Rahul while putting an entirely new explanation said that both the motorcar and the insect experienced the same force and a change in their momentum. Comment on these suggestions.

An object of mass 100 kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

An object of mass 1 kg travelling in a straight line with a velocity of 10 m/s collides with and sticks to a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.

A bullet of mass 10 g travelling horizontally with a velocity of 150 m/s strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block and also calculate the magnitude of the force exerted by the block on the bullet

A hockey ball of mass 200 g travelling at 10 m/s is struck by a hockey stick so as to return it along its original path with a velocity of 5 m/s. Calculate the magnitude of change of momentum that occurred in the motion of the hockey ball due to the force applied by the hockey stick.

According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move.

Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?

What is the momentum of an object of mass m, moving with a velocity v? (a) (mv)² (b) mv² (c) ½ mv² (d) mv

An automobile vehicle has a mass of 1500 kg. What must be the force between the vehicle and road if the vehicle is to be stopped with a negative acceleration of 1.7 m s–2?

A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: (a) the net accelerating force and (b) the acceleration of the train.

A stone of 1 kg is thrown with a velocity of 20 m s–1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes

A batsman hits a cricket ball which then rolls on a level ground. After covering a short distance, the ball comes to rest. The ball slows to a stop because (a) the batsman did not hit the ball hard enough. (b) velocity is proportional to the force exerted on the ball. (c) there is a force on the ball opposing the motion. (d) there is no unbalanced force on the ball, so the ball would want to come to rest.

Why is it advised to tie any luggage kept on the roof of a bus with a rope?

An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on

Why do you fall in the forward direction when a moving bus brakes to a stop and fall backwards when it accelerates from rest?

Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

In the following example, try to identify the number of times the velocity of the ball changes: “A football player kicks a football to another player of his team who kicks the football towards the goal. The goalkeeper of the opposite team collects the football and kicks it towards a player of his own team”. Also identify the agent supplying the force in each case.

Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five rupees coin and a one-rupee coin?