 # Newton’s 1st Law of Motion

## Presentation on theme: "Newton’s 1st Law of 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 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 inertia Inertia comes from the Latin word meaning lazy.

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/s2

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.

Formula 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 N B 0.8 N C 1.5 N D 6.0 N Formula 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

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

Newton’s 3rd 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
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: