A-LEVEL PHYSICS: 4.4.2: Newton's Second Law (SaveMyExams) Flashcards
Newton’s Second Law:
F = ma
The Resultant Force acting on an object with a Constant Mass is Directly Proportional to its Acceleration.
According to Newton’s Second Law, the Resultant Force always…
Acts in the Same Direction as the Acceleration.
What happens when Unbalanced Forces act on an object?
Resultant Force
(causes Acceleration or Δp)
When Unbalanced Forces act on an object, the object experiences a…
Resultant Force.
What happens to the object when the Resultant Force acts in the same Direction as the objects Motion?
Acceleration/Deceleration.
What happens to an object when the Resultant Force acts at an Angle to the Direction of the objects Motion?
Change Direction.
Force is a ___ quantity with both ___ & ___.
The Resultant Force is therefore the ___ ___ of all the Forces acting on the body.
Vector, Direction, Magnitude, Vector Sum
Acceleration is a ___ Quantity.
Vector.
If the Resultant Force acts in the direction of an object’s Motion, the Acceleration is…
Positive.
If the Resultant Force opposes the Direction of the object’s Motion, the Acceleration is…
Negative.
Acceleration will always…
Act in the same Direction as the Resultant Force.
Newton’s Second Law can also be given in terms of…
Momentum.
Newton’s Second Law (in terms of Momentum):
F = ∆p / ∆t
The Resultant Force on an object is equal to its Rate of Change of Momentum.
Newton’s Second Law in terms of Momentum: The ___ ___ on an object is equal to its…
Resultant Force, Rate of Change of Momentum.
The Resultant Force is always in the same Direction as the…
Change in Momentum (or Acceleration)
Derive the Equation for Newton’s Second Law in terms of Momentum: (5)
p = mv
∆p/∆t = m (∆v/∆t)
F = m (∆v/∆t)
a = ∆v/∆t
∴ F = ma
