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IAT CH2 Review 1

Physical Science Chapter 2 Safety Review (Unit Vocabulary)

QuestionAnswer
momentum product of mass and the velocity of an object
conservation of momentum total momentum before a collision equals the total momentum after a collision
inertia a mass resistance to change --more mass more inertia (N s)
Newton's 1st Law objects at rest stay at rest, objects in motion stay in motion along a straight line with the same speed unless acted upon by an unbalanced force
Newton's 2nd Law objects with mass accelerate in the direction of the unbalanced force
Kinetic Energy the energy an object has because they are in motion depends on mass and velocity of the object
Work force times distance equal to change in energy work = change in the kinetic energy of an object
Force diagram diagram that shows all forces acting on an object
strobe photos (dot diagrams) shows the motion of an object through time
balanced forces All force add to zero--object will continue to do what it is doing
inelastic "sticky" collisions When two objects collide and stick together. They have one velocity after the collision
elastic "bouncy" collisions When two objects collide and bounce apart. Their velocities can change based on their mass
Impulse Force multiplied by time. Also equals the change of momentum.
Force Push or Pull (N)
Net Force The sum of all forces acting on an object
Unbalanced Force cause objects to accelerate
acceleration change in velocity over time - speeding up, slowing down, change in direction
Newton's 3rd Law every action has an equal and opposite reaction
Change in Kinetic Energy Work
vector has both magnitude and direction
Law of Inertia another name for Newton's 1st Law - deals with objects at rest and in motion
Created by: MrLock