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PHYSICS CHAPTER 5 STUDY GUIDE - Fill in the blanks as you study the chapter.
5.1
NEWTON'S LAWS OF MOTION
Forces
A force is a (1) or a (2). Because a force is a vector quantity, it has both magnitude and (3). Physicists
group all forces into four kinds. They are (4), (5), (6), and (7). The weakest of the four forces is
(8). Charged particles cause the (9) force to be exerted. The (10) force is the strongest of the four
forces, but only acts over small distances. The (11) force is involved in the radioactive decay of
some nuclei. This force has been linked with the (12) force.
Newton's First Law of Motion
Forces acting on an object can be (13) to produce the net force on the object. If all the forces acting in one direction
are (14) all the forces acting on the object in the opposite direction, the net force is zero. According to (15) law, if
there is no net force on an object, the object remains at rest, or moves with (16) velocity in a (17) line.
Newton's Second Law of Motion
If there is a net force on an object, the object will be accelerated, or change (18). The amount of acceleration
caused depends on the (19) of the force and the (20) of the object. Newton's second law can be written as an
equation, (21). This equation means that acceleration is (22) proportional to force and (23) proportional to mass.
The direction of the force and the direction of the acceleration are (24).
The Unit of Force
The unit of force is defined in terms of Newton's (25) law. The unit of force is the (26), abbreviated as (27). The
amount of force that causes a mass of (28) to accelerate at a rate of (29) is equal to one newton.
Newton's Third Law of Motion
Newton's third law describes pairs of forces called (30) forces. These two forces are (31) in magnitude and (32) in
direction. According to this law, if a book pushes downward on a table, the table pushes (33) against (34).
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