forces. > identify the law that says that objects change their motion only when a net force is...
TRANSCRIPT
Forces
> > IdentifyIdentify the law that says the law that says that objects change their that objects change their motion only when a net force is motion only when a net force is applied.applied.
> > Relate Relate the first law of motion the first law of motion to important applications, such to important applications, such as seat belt safety issues.as seat belt safety issues.
> > CalculateCalculate force, mass, and force, mass, and acceleration by using Newton’s acceleration by using Newton’s second law.second law.
Sir Isaac NewtonBritish scientist (1642-1727)
ForceGravityCalculus
http://www.youtube.com/watch?v=iH48Lc7wq0U
Newtons Law's Clip
He formed 3 laws to show the relationship between motion and force.Motion- change in positionForce- a push or pull that affects motion of an object
An Object at rest remains at rest and an object in motion maintains its velocity unless acted upon by an unbalanced force.
An unbalanced force must be greater than zero
Inertia (def)- the tendency of an object to resist change in its velocity or lack of
The ability of matter to resist a change in motion is dependent on its mass.
Larger masses are harder to change than smaller
Example- playing Example- playing softball with a bowling softball with a bowling ballball
Seatbelts Seatbelts provide provide protection protection against a against a persons persons own inertia.own inertia.
The unbalanced force acting on an object equals the objects mass times its acceleration
Force= mass X acceleration F=m x a
Mass- amount of matter in an object
Acceleration- any change in velocity ex.
Empty vs full cart.
Size of force and mass effect acceleration.
SI units for force is NEWTON- a derived unit (2 units put together)
kg x m/s2 mass (kg)and acceleration (m/s2)
F= (m * a) a= F/m