Monday, August 21, 2017

Friday, June 30, 2017

9th grade: Test No. 2 9th grade 2nd trimester 2017 Study Guide

Review the problems of Newton’s Second Law (Forces), the graphs of the pages 283 and 305 and the vocabulary (balanced forces, centripetal acceleration, deceleration, free fall, force, inertia, net force, Newton’s first law of motion, Newton’s second law of motion, Newton’s third law of motion, orbit, positive acceleration, unbalanced forces, velocity).

Last day to turn in the problems of Newton’s Second Law (12 problems). For additional information and videos, consult the teacher’s blog.

Required supplies: pen, pencil, eraser, study chart and scientific calculator.

Click on this link to study examples of problems of the Newton's Second Law

Newton’s Second Law (Problems for discussion in class)

Vocabulary

Balanced forces
Forces that produce a net force of zero; they do not cause motion.
Centripetal acceleration
Acceleration that occurs when an object moves in a circular path.
Deceleration
Acceleration that occurs when an object decreases its speed.
Free fall
Occurs when gravity is pulling down an object and no other forces are acting on it.
Force
Push or pull acting on an object.
Inertia
Tendency of an object to resist any change in its motion.
Net force
Combination of all the forces acting on an object.
Newton’s first law of motion
“An object remains at rest or maintains its velocity unless it experiences an unbalanced force”
Newton’s second law of motion
“The acceleration of an object depends on the mass of the object and the amount of force applied”

Newton’s third law of motion
“The strength of a reaction force is equal to the strength of the action force”

Orbit
Occurs when an object travels around another object in space.
Positive acceleration
Acceleration that occurs when an object increases its speed.
Unbalanced forces
Forces that produce a net force greater than zero; they cause motion.
Velocity
Speed in a given direction.