PHY 2020 Chapter Notes - Chapter 5: Exhaust Gas, Headon, Net Force
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Every force is part of an interaction between one ting and another. Figure 5. 2: when you lean against a wall, you exert a force on the wall. The wall si(cid:373)ulta(cid:374)eousl(cid:455) e(cid:454)e(cid:396)ts a(cid:374) e(cid:395)ual a(cid:374)d opposite fo(cid:396)(cid:272)e o(cid:374) (cid:455)ou. There is a pair of forces involved: your push on the wall and the wall pushing back on you. These forces are equal in magnitude (have the same strength) and opposite in direction, and they constitute a single interaction. Figure 5. 3: the boxer can hit the massive bag with considerable force. But with the same punch he can exert only a tiny force on the tissue paper in midair. Fu(cid:396)the(cid:396)(cid:373)o(cid:396)e, the fist (cid:272)a(cid:374)"t exert any force back. An interaction requires a pair of forces acting on two separate objects. Figure 5. 4: in the interaction between the hammer and the stake, each exerts the same amount of force on the other.
