Hence, walking is possible because a pair of action-reaction forces act on the feet and the ground. Similarly, if the action force supplied by the foot of the person is significantly higher, the reaction force can help us to jump. In absence of the reaction force produced by the ground, our foot sinks. The ground in response exerts an equal amount of force in the opposite direction. When we walk, a significant amount of force and pressure is exerted on the ground by our feet. This force is nothing but the reaction force. The force that the ground or wall exerts on the ball in response to the action force causes the ball to jump or bounce back. The force exerted by the ball on the ground or wall is the action force. When a ball is thrown on the floor or a wall, it bounces back. The only difference is that the rocket is required to carry an oxidizing agent because it has to enter an environment that does not contain oxygen. A similar process occurs in the jet engine. These gases when hit the ground cause a force that helps the rocket to move upward. When a rocket is ignited, a series of chemical reactions take place that generate a huge amount of gases. In contrast to the action force, a reaction force gets generated that pushes the boat and causes it to move. The force applied by the person on the rigid surface of the ground is the action force. When a person jumps out of a boat and steps on the bank, the boat moves back in the direction opposite to the direction of the jump. Hence, the chair moves in a backward direction. The reaction force is always exerted in the direction opposite to the direction of the action force. Therefore, the force responsible to move the chair is the reaction force. The motion of the chair can not exist without the existence of a force. When a person sitting on a chair pushes the wall with his feet, the chair moves backward. This pair of forces, acting together simultaneously on the person’s body and the water, causes the person to swim in the forward direction. This force applied by the person acts as the action force, which leads to the generation of a reaction force. This is the reason why a person operating a gun takes the support of his shoulder to avoid injury.Ī person swimming in a forward direction pushes the water in the backward direction with his/her hands. The jerk felt on the gun that pulls it in the backward direction exists due to the reaction force. The action force exerted due to firing is in a forwarding direction that causes the bullet to move ahead. When a bullet is fired from a gun, the gun moves backward. the opposition which a body offers to a change in velocity.The recoil of a gun is one of the best demonstrations of action-reaction forces. c the quantity of motion possessed by a body. b the quantity of inertia possessed by a body. The definition of momentum is: a the quantity of mass possessed by a body. The combination of correct statements is: ന ് റ ര 24. 4- the units of acceleration are seconds per metre per metre. 3- the units of acceleration are kilogram-metres per second. 2- the units of acceleration are metres per second. When considering acceleration: 1 - acceleration is the rate of change of velocity. the acceleration of a body in direct proportion to its mass. rate of change of displacement the quantity of motion possessed by a body. every action has an equal and opposite reaction. every force has an equal and opposite inertia. the energy possessed by a mass is inversely proportional to its velocity. The combination of true statements is: a. 4- the acceleration of a body from a state of rest, or uniform motion in a straight line, is proportional to the applied force and inversely proportional to the mass. 3- if two forces are applied to the same mass, the bigger the force the greater the acceleration. 2- if the same force is applied, the larger the mass the slower the acceleration. Considering Newton's second law of motion: 1 - every action has an equal and opposite reaction.
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