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Chpt. 12 Physics

Forces and Motion

QuestionAnswer
What are the four main types of friction? Static, Sliding, Rolling and fluid
Newton's First Law of Motion State of motion of an object does not change as long as net force equals zero
Newton's Second Law of Motion Acceleration of an object is equal to net force acting on it divided by object's mass
Acceleration=? Net force / Mass
Weight =? Mass x Acceleration due to gravity
Measure of the inertia of an object Mass
Measure of the force of gravity acting on an object Weight
Newton's Third Law of Motion forces exist as equal and opposite force pairs
Momentum =? Mass x Velocity
Law of Conservation of Momentum If no force acts on a system, the total momentum of system does not change
Forces that can attract and repel (2) Electric and Magnetic
Newton's Law of Universal gravitation every object in the universe attracts every other object
Force that causes a 1kg mass to accelerate at rate of 1m/sec/sec Newton
overall force acting on an object after all forces are combined Net Force
Push or pull that acts on an object Force
Anything that can change the motion of a body Force
If a body moves, slows down or changes direction, a _____has acted on it Force
Forces that are in opposite direction and equal in size are Balanced forces
Force that opposes the motion of a body Friction
Can not change the motion of a body Balanced forces
Can change the motion of a body Unbalanced forces
Force that acts on objects that are not moving Static Friction
Force that opposes the direction of a motion as it slides over a surfact Sliding Friction
Force that acts on rolling objects Rolling Friction
Opposes the motion of an object through a fluid Fluid Friction
Force acting on an object moving through the air Air resistance
Force that acts between two masses Gravity
When the force of gravity and air resistance are equal Terminal velocity
Motion of a falling object after it is given an initial forward velocity Projectile Motion
Earth's gravitional force acts in what direction towards the center of the earth
Why does a projectile follow a curved path Combination of initial forward velocity and downward force of gravity
Force =? Mass x Acceleration
Tendency of an object to resist change in motion Inertia
Force of gravity acting on an object Weight
Measure of the inertia of an object Mass
Product of an object's mass and velocity Momentum
An object has a large momentum if .... the product of it's mass and velocity is large
What force holds the nucleus together Strong and weak nuclear forces
The greater the force acting on the body the ____the acceleration larger
Under a given force, the greater the mass of an object, the ____ the acceleration smaller
Unit for acceleration Meter/sec/sec
The greater the distance between two bodies, the____the attraction between them smaller
Force associated with charged particles Electromagnetic Force
Force of attraction that acts on the neutrons and protons in the nucleus, holding them together Strong Nuclear Force
Attractive force that acts only over a short range Weak nuclear force
Attractive force that acts between any two masses Gravitational force
Center directed force that continuously changes the direction of an object to make it move in a circle Centripetal force
Momentum is conserved in a.... closed system
Created by: msivola
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