The third law states that all forces exist in pairs: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal and opposite: FA = −FB. The third law means that all forces are interactions between different bodiesand thus that there is no such thing as a unidirectional force or a force that acts on only one body. This law is sometimes referred to as the action- reaction law, with FA called the "action" and FB the "reaction". The action and the reaction are simultaneous, and it does not matter which is called the action and which is called reaction; both forces are part of a single interaction, and neither force exists without the other.The two forces in Newton's third law are of the same type (e.g., if the road exerts a forward frictional force on an accelerating car's tires, then it is also a frictional force that Newton's third law predicts for the tires pushing backward on the road). action- reaction lawaction- reaction law
From a conceptual standpoint, Newton's third law is seen when a person walks: they push against the floor, and the floor pushes against the person. Similarly, the tires of a car push against the road while the road pushes back on the tires—the tires and road simultaneously push against each other. In swimming, a person interacts with the water, pushing the water backward, while the water simultaneously pushes the person forward—both the person and the water push against each other. The reaction forces account for the motion in these examples. These forces depend on friction; a person or car on ice, for example, may be unable to exert the action force to produce the needed reaction force
And now some exercises! What is Newton's Third Law about? A. F=MA B. What ever is in motion stays in motion C. Action-Reaction Forces What happens to the wheels of a car on an icy road? A. The wheels on the car can't grip the road B. The wheels don't move C. The wheels fall off Which of the following pairs are action-reaction pairs? A. The sun shines and the snow melts B. The ball hits the window and the window breaks C. Jenna pushes on the table and the table pushes on Jenna A B C A B C A B C A B C A B C A B C
What do we call the forces that constitute an interaction in Newton's 3rd law? A. Action-Reaction forces B. Force-Interaction forces C. Horse-Cart forces D. Jenna-Joya Forces Inanimate objects can exert forces. A. True B. False What happens when 2 cars with different masses have a head-to- head collision? A. The car with less mass has a greater time of impact. B. They experience the same force of impact. C. The cars just bounce off each other. A B C D A B A B C A B C D A B A B C
If two cars with different masses experience the same Force of Impact and the same impulse then what would be different? A. Change of momentum B. Time of impact C. Momentum D. Acceleration If you push on something, it....? A. pushes back on you. B. doesn't moves. C. falls. D. swings. If you have on rollerskates and you push on a wall, what will probably happen? A. You fall. B. You roll back. C. You crash into the wall. D. You slip and DIE. A B C D A B C D A B C D A B C D A B C D A B C D
A person touches his/her nose and his/her nose touches back. A. True B. False A. B A. B
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