Presentation on theme: "Newton’s 1st Law of Motion Object in motion stays in motion."— Presentation transcript:
Newton’s 1st Law of Motion Object in motion stays in motion
Newton’s 1st Law of Motion And Objects at rest stay at rest
Newton’s 1st Law of Motion Until they are acted upon by unbalanced forces.
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
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
Newton’s 2nd Law of Motion The greater the mass of an object, the greater the force required to change its motion.
Newton’s 2nd Law of Motion The greater the acceleration of an object, the greater the force required to change its motion.
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
Newton’s 3rd Law of Motion For every action force there is an equal and opposite reaction force.
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
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: