Presentation on theme: "Newton’s 1st Law of Motion"— Presentation transcript:
1Newton’s 1st Law of Motion Object in motion stays in motion
2Newton’s 1st Law of Motion And Objects at rest stay at rest
3Newton’s 1st Law of Motion Until they are acted upon by unbalanced forces.
4Inertia or Newtons 1st 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 inertiaInertia comes from the Latin word meaning lazy.
5Newton’s 2nd Law of Motion Force = Mass X AccelerationF=maWeight (pull of gravity) is acommonly measured force, calculated by F=mg, g is the acceleration due to gravity 9.8 m/s2
6Newton’s 2nd Law of Motion The greater the mass of an object, the greater the force required to change its motion.
7Newton’s 2nd Law of Motion The greater the acceleration of an object, the greater the force required to change its motion.
8Formula chart says F=ma, m is mass in kg, a is acceleration in m/s2. 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/s2, what is the force the frog exerts on the lake’s bank when leaping?A 0.2 NB 0.8 NC 1.5 ND 6.0 NFormula chart says F=ma, m is mass in kg, a is acceleration in m/s2.So, .5 kg x 3 m/s2= 1.5 N
9Newton’s 3rd Law of Motion For every action force there is an equal and opposite reaction force.
10Newton’s 3rd Law of Motion All forces come in action-reaction pairsEx: feet push backward on floor, the floor pushes forward on feet
1127 A ball moving at 30 m/s has a momentum of 15 kg·m/s 27 A ball moving at 30 m/s has a momentum of 15 kg·m/s. The mass of the ball is —A 45 kgB 15 kgC 2.0 kgD 0.5 kgFormula Page says that Momentum = Mass x VelocitySo 15 kg.m/s = M x 30 m/s solving for M it is: