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Newton’s Laws of Motion
Force & Acceleration
Newton’s Laws of Motion
Learning Objectives
• Analyze relationships between forces and motion
• Calculate the effects of forces on objects
Force & Acceleration
• Newton’s second law of motion – states that the
acceleration (a) of an object is directly related to the net
force on the object (Fnet) and inversely related to the mass
of the object (m)
• Units of newtons can be broken down using Newton’s
second law
Force & Acceleration Example
Ex) A 91 N force causes an object to accelerate at 0.76 m/s2.
What is the mass of the object?
I.
II.
Strategy
Given and unknown
IV. Conversions needed? No.
V.
Intermediates needed? No.
VI. Solve
III. Formula
so
VII. Does the result make sense? Yes.
Force & Acceleration Example
Ex) A 250 N net force is applied to a 72 kg object. What is the
acceleration of the object?
I.
II.
Strategy
Given and unknown
IV. Conversions needed? No.
V.
Intermediates needed? No.
VI. Solve
III. Formula
so
VII. Does the result make sense? Yes.
Force & Acceleration Example
Ex) A 5.0 kg object is traveling at a constant velocity of 3.2 m/s.
What is the net force acting on the object?
I.
II.
Strategy
Given and unknown
IV. Conversions needed? No.
V.
Intermediates needed? No.
VI. Solve
III. Formula
VII. Does the result make sense? Yes.
Newton’s Laws of Motion
Learning Objectives
• Analyze relationships between forces and motion
• Calculate the effects of forces on objects