Forces Flashcards
What 3 things can forces acting on a body cause it to do?
Change shape
Change speed
Change direction
What is friction?
A force that opposes motion.
What are forces measured in?
Newtons, N.
What is the equation for the resultant force acting on an object?
FR = F1 + F2
What is Newton’s 1st law?
Forces on a system are balanced and so FR = 0, onj3ct will not accelerate.
What are the 2 possible states of motion for Newton’s 1st law?
Stationary
Moving with constant velocity
What is Newton’s 2nd law?
FR = m a, so Fr / m = a; acceleration, a of a body is directly proportional to the resultant force, FR, and inversely proportional to mass, m.
What happens when a body complies with Newton’s 2nd law?
Forces are unbalanced.
There is resultant force FR.
Object forced to accelerate.
What 2 things can an object do to accelerate?
Change speed
Change direction
What is the equation for Newton’s 2nd law?
FR = m x a
What are the quantities involved in FR = m a?
FR = resultant force / N
m = Mass / kg
a = acceleration / m/s2^
What is mass?
Amount of matter in an object.
What is mass measured in?
Kilograms / kg
What is weight?
Force due to the pull of gravity on object.
What is weight measured in?
Newtons / N
What is the pull of gravity on Earth?
10N
What is the equation for weight?
W = m x g
What are the quantities involved in W = m g?
W = weight / N
m = mass / kg
g = gravitational field of strength / N/kg
