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IAT CH2 Review 1
Physical Science Chapter 2 Safety Review (Unit Vocabulary)
Question | Answer |
---|---|
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 |