Sometimes the identity of the pair of action and reaction forces in an interaction is not immediately obvious. For example, what are the action and reaction.

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Presentation transcript:

Sometimes the identity of the pair of action and reaction forces in an interaction is not immediately obvious. For example, what are the action and reaction forces in the case of a falling boulder? If we call the action “Earth exerting a force on the boulder”, then the reaction is “the boulder simultaneously exerting a force on Earth”. 7.3 Identifying Action and Reaction

When action is A exerts force on B, the reaction is simply B exerts force on A. 7.3 Identifying Action and Reaction

think! We know that Earth pulls on the moon. Does the moon also pull on Earth? If so, which pull is stronger? Answer: Both Earth and moon pull on each other with equal and opposite forces. 7.3 Identifying Action and Reaction

A given force exerted on a small mass produces a greater acceleration than the same force exerted on a large mass. 7.4 Action and Reaction on Different Masses

Earth is pulled up by the boulder with just as much force as the boulder is pulled down by Earth. 7.4 Action and Reaction on Different Masses

Although the pair of forces between the boulder and Earth is the same, the masses are quite unequal. Acceleration is not only proportional to the net force, but it is also inversely proportional to the mass. a=F/m Because Earth has a huge mass, we don’t sense its small acceleration. 7.4 Action and Reaction on Different Masses

Force and Mass When a cannon is fired, there is an interaction between the cannon and the cannonball. The force the cannon exerts on the cannonball is exactly equal and opposite to the force the cannonball exerts on the cannon. 7.4 Action and Reaction on Different Masses

The cannonball undergoes more acceleration than the cannon because its mass is much smaller. 7.4 Action and Reaction on Different Masses

F represents both the action and reaction forces; m (large), the mass of the cannon; and m (small), the mass of the cannonball. Do you see why the change in the velocity of the cannonball is greater compared with the change in velocity of the cannon? 7.4 Action and Reaction on Different Masses

The balloon recoils from the escaping air and climbs upward. 7.4 Action and Reaction on Different Masses

If a balloon is released and allowed to move, it accelerates as the air comes out. A rocket accelerates in much the same way—it continually recoils from the exhaust gases ejected from its engine. 7.4 Action and Reaction on Different Masses

A common misconception is that a rocket is propelled by the impact of exhaust gases against the atmosphere. – NOT TRUE! Both the rocket and recoiling cannon accelerate because of the reaction forces created by the “cannonballs” they fire—air or no air. In fact, rockets work better above the atmosphere where there is no air resistance. 7.4 Action and Reaction on Different Masses

The rocket recoils from the “molecular cannonballs” it fires and climbs upward. 7.4 Action and Reaction on Different Masses

think! A tug of war occurs between boys and girls on a polished floor that’s somewhat slippery. If the boys are wearing socks and the girls are wearing rubber-soled shoes, who will surely win, and why? 7.4 Action and Reaction on Different Masses

 Answer: The girls will win. The force of friction is greater between the girls’ feet and the floor than between the boys’ feet and the floor. When both the girls and the boys exert action forces on the floor, the floor exerts a greater reaction force on the girls’ feet. The girls stay at rest and the boys slide toward the girls.