3.2 - Motion - Forces in action Flashcards
What equation links resultant force mass and acceleration
F = ma
What is the SI unit and unit for measure of force
kgms^-2 / Newtons
What is meant by terminal velocity
When the forces acting on the falling object become balanced so the resultant force is 0. The acceleration becomes 0 and the object is moving at its maximum velocity.
What is meant by an object in equilibrium
All forces in any opposing directions are equal meaning that the object is not moving
What is the principle of moments
For an object in equilibrium, the sum of the clockwise moments is equal to the sum of the anticlockwise moments.
What is a moment
A turning force : force x perpendicular distance
What is density
The mass per unit volume of a substance. kgm^-3
What is pressure
The normal force exerted on a surface per unit area
What is pressure measured in
Pascals / 1 Pa = 1 Nm^-2
What is the equation for density
p = m / v
density = mass / volume
