Newton's Laws
100: What is the formula for Newton's second law?
acceleration = net force/mass
Friction is a force that _______________ sliding motion between touching surfaces
resists
Acceleration is a measure of the change in _______________ during a period of time
velocity
What unit is used for acceleration in Newton's second law equation? a=F/m
acceleration is in meters per second per second
What happens when the net force on an object is zero?
The object's motion does not change
What factors affect friction?
Surface roughness, surface area, and weight
Does acceleration only mean when something speeds up?
No, acceleration refers to something that speeds up, slows down, or changes direction
What unit is used for mass in Newton's second law equation? a=F/m
mass is in kg
Who studied how forces affect motion?
Isaac Newton
__________________ is A push or pull between objects that are touching
contact force
What determines the direction of an acceleration arrow?
Whether velocity is increasing or decreasing
When looking at arrows that represent acceleration, what does the length of the arrow show?
the amount of acceleration
What does a free-body diagram help to do?
To understand the forces acting on an object
What happens when you push a book across and table and let go?
Friction gradually brings the book to a stop
________________ is the sum of all forces acting on an object
net force
__________________ is The constant velocity when air resistance equals gravity
terminal velocity
How do balanced forces affect motion?
They cause no change in the object's motion
What unit is used for force in Newton's second law equation? a=F/m
force is in newtons