NEWTONS 2 ND LAW OF MOTION NOTES UNBALANCED

NEWTON’S 2 ND LAW OF MOTION NOTES UNBALANCED FORCES • What happens to an object when there are unbalanced forces acting upon it? _____________. • In what direction does the acceleration occur? ______________ west _____________. east Net force =

NEWTON’S SECOND LAW OF MOTION: • States that the _______________ acting on an object equals the object’s _____ times its _______________. – Force equals mass times acceleration. – F Force (F) = mass (m) X acceleration (a) – F = ma or (m = F/a) or (a = F/m) m a • Force is measured in _________ (____) • Mass is measured in _________ (____) • Acceleration is measured in (______) • 1 N = 1 kg X 1 m/s 2

FORCE/ACCELERATION RELATIONSHIP • If _________ stays constant… – As force ______________ then acceleration _____________ – Direct Relationship ( or ) Same _____ Force ______________ Acceleration _____________

FORCE/MASS RELATIONSHIP • If acceleration stays constant… – As mass increases then force increases – a = F/m – Direct Relationship ( or ) Mass _______ Same ________ Mass _____________ Force ________

MASS/ACCELERATION RELATIONSHIP • If force stays constant… – As mass decreases then acceleration increases – F = ma – Inverse Relationship ( or ) Same ________ Mass ______________ Acceleration _______

F = ma Problem #1 F m a • What is the force of a 25 kg ball accelerated at 9. 8 m/s 2 downward?

F = ma Problem #2 F m a • A 63 kg skater pushes off from a wall with a force of 300 N. What is the skater’s acceleration traveling north?

F = ma Problem #3 F m a • If a rock has an acceleration of 40 m/s 2 and hits with a force of 285 N, what is its mass?