2nd law of motion

FOCUS POINT:
•State Newton’s Second Law
of Motion and explain how
force mass are related to
acceleration.

• The acceleration of an object as
produced by a net force is directly
proportional to the magnitude of
the net force, in the same direction
as the net force, and inversely
proportional to the mass of the
object.

• The second law states that the acceleration of
an object is dependent on two variables– the
net force acting on the object and the mass of
the object.
• The acceleration of an object depends directly
on the net force acting on the object and
inversely on the mass of the object. As the net
force increases, so will the object’s
acceleration. As the mass of an object
increases, its acceleration will decrease.

• In terms of an equation, the net force is equal to the
product of the object’s mass and its acceleration.
Fnet = ma or ∑F = ma
• And to solve the acceleration:
a= Fnet
m

Sample problem
• What is the mass of a falling rock if it produces a
force of 160N while it accelerates 8m/s²?
• What is the mass of a truck if it produces a force of
14,000N while accelerating at a rate of 10m/s²?
• What net force is required to accelerate a car at a
rate of 5m/s² if the car has a mass of 3,000kg?
• A 20kg bowling ball would require what force to
accelerate down an alleyway at a rate of 5m/s²?
• Sally has a car that accelerated at 2m/s². If the car
has a mass of 5000kg, how much force does the car
produce?

2nd law of motion

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