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1.03 The Laws of Motion
Newton’s first law of motion
 The first law of motion has two simple principles:
 An object at rest (not moving) will stay at rest unless an
unbalanced force acts on it.
 An object in motion will stay in motion (in a straight line and at
a constant speed) unless an unbalanced force acts on it.
Newton’s second law
 Newton’s second law of motion states that the acceleration of
an object depends directly upon the net force and inversely
upon the mass
Newton’s third law
 Newton’s third law of motion is all about the interactions
between forces. Forces come in pairs that are equal but
opposite. The third law of motion states that for every
action (force applied) there is an equal and opposite reaction
(resulting force) that will occur.
Assessment (choose one)
 Amusement parks are a great place to see Newton's laws of
motion in action. Choose your favorite ride and describe the parts
of the ride that illustrate each of Newton's laws of motion.
 Understanding the laws of motion can enhance performance in
sport activities. Choose your favorite sport and describe where
players use Newton’s three laws of motion to be successful.
 In the United States, car accidents are the leading cause of death
for teenagers. Wearing seat belts helps save lives. Describe how
Newton’s three laws of motion are used in testing the safety of our
automobiles.
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