Term

Definition
interaction between two objects 


Term
What are the four fundamental forces? 

Definition
gravitational, electromagnetic, strong nuclear, weak nuclear 


Term
All common forces are _____. 

Definition


Term
The strong nuclear forces holds ____together. 

Definition


Term
The weak nuclear force is the force that holds ____together. 

Definition


Term
The electromagnetic force is the ____. 

Definition
attraction and repulsion between like and unlike objects 


Term
In a free body diagram, if a object is stopped or moving at a constant speedwhat does that mean? 

Definition


Term
What is inertia? Who came up with the principle of inertia? 

Definition
property of a mass to resist a change in motion; galileo 


Term
What is newton's first law? 

Definition
the law of inertia; an object at rest will remain at rest and an object in motion will remain in motion at a constant speed in a straight line unless acted on by an outside force 


Term
What does it mean if forces are balanced? 

Definition
the object is either at rest or moving at a constant speed 


Term
HOw do you combine forces to get a net force? 

Definition
if they are on the same line you can add them/subtract 


Term
What is the net force on a 10 N east and 15 N west? is teh object accelearting? 

Definition
5 N west; yes because there is a net force 


Term
When can you use north east and south east? 

Definition
when there is a forty five degree angle 


Term
What is newton's second law? What is the equation that goes along with it? 

Definition
the law of acceleration; acceleration is directly proportional to the net force and inversly proporrtional to the mass. a=F net/m 


Term
you have to do tan^1 to find theta 

Definition


Term
What is the difference between mass and weight? how do you find the weight if you know the mass? how do you find the mass if you know the weight? 

Definition
mass is a scalar and it is the amount of matter or the amount of inertia; weight is the force of gravity, it is a vector, moves downlards, and is measured in newtons. Fw=mg 


Term
If a mass of 14 kg. is acted on by a force of 28 N. what is the acceleration? 

Definition


Term
What determines how much friction is on an object? 

Definition
the normal forcethe bigger the normal force, the more friction; and the surfacehow smooth is it? 


Term
What is the coefficient of friction? What is the equation for the coefficient of friction? 

Definition
frictioin/normal force = coefficient of friction 


Term
the normal force is equal to the ____when the speed is constant or the object is at rest. 

Definition


Term
If an object has a mass of 10 kg. and is pulled at a constant speed by a force of 29 N, what is the coefficient of friction? 

Definition
29 N is the friction; coefficient of friction is = 29/9.8 x10 


Term
What two factors affect the air resistance of a falling object? 

Definition


Term
What is the terminal velocity? 

Definition
when the weight down equals the air resistance up 


Term
A falling book has a mass of 2.5 kg. The air resistance on the book is 15 N. What is the acceleration of the book? 

Definition
F net=24.515=9.5 and a=9.5/2.5=3.8 m/s squared 


Term
What is newton's third law? 

Definition
the law of interactionfor every action there is an equal and opposite reaction; there are two forces and two objects 


Term
What is an actionreaction pair? Why don't they cancel out? 

Definition
equal and opposite forces that are acting on opposite objects; do not cancel because they act on different objects 


Term
in action reaction do both objects move with the same speed? why? 

Definition
no because of the differences in mass 

