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Newton’s 1st Law of Motion Object in motion stays in motion.

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Presentation on theme: "Newton’s 1st Law of Motion Object in motion stays in motion."— Presentation transcript:

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2 Newton’s 1st Law of Motion Object in motion stays in motion

3 Newton’s 1st Law of Motion And Objects at rest stay at rest

4 Newton’s 1st Law of Motion Until they are acted upon by unbalanced forces.

5 Inertia or Newtons 1 st Law Tendency for an object to stay at rest or moving in a straight line at a constant speed. The mass (m measured in kg) of an object determines its inertia

6 Newton’s 2nd Law of Motion Force = Mass X Acceleration F=ma Weight (pull of gravity) is a commonly measured force, calculated by F=mg, g is the acceleration due to gravity 9.8 m/s 2

7 Newton’s 2nd Law of Motion The greater the mass of an object, the greater the force required to change its motion.

8 Newton’s 2nd Law of Motion The greater the acceleration of an object, the greater the force required to change its motion.

9 A 0.2 N B 0.8 N C 1.5 N D 6.0 N 11 The frog leaps from its resting position at the lake’s bank onto a lily pad. If the frog has a mass of 0.5 kg and the acceleration of the leap is 3 m/s 2, what is the force the frog exerts on the lake’s bank when leaping? Formula chart says F=ma, m is mass in kg, a is acceleration in m/s 2. So,.5 kg x 3 m/s 2 = 1.5 N

10 Newton’s 3rd Law of Motion For every action force there is an equal and opposite reaction force.

11 Newton’s 3 rd Law of Motion All forces come in action- reaction pairs Ex: feet push backward on floor, the floor pushes forward on feet

12 27 A ball moving at 30 m/s has a momentum of 15 kg·m/s. The mass of the ball is — A 45 kg B 15 kg C 2.0 kg D 0.5 kg Formula Page says that Momentum = Mass x Velocity So 15 kg. m/s = M x 30 m/s solving for M it is:


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