Figure shows a boy kicking a football and a rock. (The negative sign shows that the force is acting against the initial direction of motion of the ball)Įxample 2. (b) the impulsive force exerted on the ball by the hands. The time of contact between the hand and the ball is 0.05 s. Figure shows the magnitudes of its velocity before and after being hit respectively. A boy hits a 0.50 kg ball and sends it moving in the opposite direction. Impulse of Force Example Problems with SolutionsĮxample 1. By doing so he increases the time interval to reduce the momentum of the ball. Cricket ball coming towards fielder has a large momentum. Hence, impulsive force is defined as the rate of change of momentum.Įxample: While catching a cricket ball a player moves his hands backwards.The force is known as the impulsive force. Impulse is a vector quantity and has the same direction as the applied force.The SI unit for impulse is newton seconds (N s).The quantity (Force x Time) is called the impulse of a force.If a force F is applied on a body of mass m for a time interval Δt and if the change in velocity is Δv then Or force is equal to the rate of change of momentum. Since (mv – mu) is the change of momentum, therefore, By definition, acceleration, a is the rate of change in velocity and is given by the formula: When a net force acts on a body, it accelerates in the direction of the force. If the period of contact between the wall and the ball is 0.1 second.From the previous section, you have seen that Newtons Second Law can be summed up by the formula F = ma. An iron ball having a mass of 100 g with a velocity of 10 m/s collides with the wall at an angle of 300 and rebounds with the same angle. What is the velocity with which it moves?ġ0. Later, a mass of 250 kg is placed in the wagon. What is the tension in the rope at 1 m from this end?ĩ. A wagon weighing 1000 kg moves 50 km/h on smooth rails. What is the velocity of the muzzle if the recoil velocity is 500 m/s.Ĩ. A rope of length 5 m is kept on a frictionless surface and a force of 5 N is applied to one of its ends. A bullet of mass 5 gm is fired from a gun of mass 5 kg. ![]() (d) React against the rocket and push it up AnswerĪnswer: (d) React against the rocket and push it upħ. (c) Heat up the air which lifts the rocket Rocket Engines lift rocket from the earth surface because the hot gas with high velocity Which of the following is momentum closely related to?Ħ. What is the motion of the rocket based on?ĥ. What is the value of this impulsive force?Ĥ. When a force acts on a ball of mass 150 g for 0.1 sec, it produces an acceleration of 20 m/s 2. ![]() What is the force exerted by the ball on the hands of the player?ģ. If the process of catching is to be completed in 0.1 sec. A player catches a ball of mass 150 gm moving at a rate of 20 m/s. (d) The flow of the air around the wings cause an upward force which compensates for the force of gravity AnswerĪnswer: (a) The thrust of the jet plane compensates the force of gravityĢ. ![]() (c) The force of gravity doesn’t act on bodies moving with high speed (b) The weight of the air is the weight of the plane (a) The thrust of the jet plane compensates the force of gravity How is a jet plane able to fly in the air? MCQ on Conservation of Linear Momentum and Impulseġ. NEET Physics Conservation of Linear Momentum and Impulse Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. NEET Physics is the scoring paper in the medical entrance examination.
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