Newton's Laws
What law deals with action and reaction forces?
Newton's 3rd Law
What is the definition of speed?
the rate at which an object moves
What is the equation of speed?
s = d/t
What is friction?
a force that opposes motion between two surfaces that are touching
Newtons
What law deals with force and acceleration?
Newton's 2nd Law
How do you find the average speed of an object?
distance/time
What is the equation for distance?
d= s x t
Swimming is an example of what type of friction?
Fluid friction
What activity in class showed balanced forces?
House/tower of cards
What is inertia?
tendency of all objects to resist any change in motion
What type of speed stays at a steady pace?
Constant speed
How do you find velocity?
v= distance in direction/time
What are three examples of sliding friction?
sledding, eraser on desk, and brakes on a car
What is momentum?
a property of a moving object that depends on the object's mass and velocity
What is Newton's 1st Law?
An object at will stay at rest and an object in motion will stay in motion unless acted on by an unbalanced force
What is the average speed of a car that is moving 50 meters in 10 seconds?
5 meters/second
What is the equation for momentum?
p= m x v
What types of friction use less force than sliding friction?
Rolling and fluid
What is the force that results from combining all the forces exerted on an object?
Net force
What law tells us that an object's acceleration decreases as its mass increases?
Newton's 2nd Law
What type of speed is constantly changing?
Instantaneous speed
a= vf-vi/t
What type of friction disappears after an object moves?
Static friction
When is the only time velocity is constant?
when an object is traveling in a straight line