Newton's 2nd Law of Motion
Newton's 2nd Law of Motion
Newton's 2nd Law of Motion
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<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong>
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
The acceleration <strong>of</strong> an object is directly proportional to<br />
the net force applied to that object and inversely<br />
proportional to its mass.
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
The acceleration <strong>of</strong> an object is directly proportional to<br />
the net force applied to that object and inversely<br />
proportional to its mass.<br />
In other words: F = ma
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
The acceleration <strong>of</strong> an object is directly proportional to<br />
the net force applied to that object and inversely<br />
proportional to its mass.<br />
In other words: F = ma<br />
force = mass x acceleration
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
If the same net force is applied to two objects and one<br />
is more massive than the other, which will accelerate<br />
more?
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
If the same net force is applied to two objects and one<br />
is more massive than the other, which will accelerate<br />
more?<br />
The less massive object!
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
Practice Problems<br />
A little boy pushes a wagon with his dog in it. The<br />
mass <strong>of</strong> the dog and wagon together is 45 kg. The<br />
wagon accelerates at 0.85 m/s 2 . What force is the<br />
boy pulling with?
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
Practice Problems<br />
A little boy pulls a wagon with his dog in it. The mass<br />
<strong>of</strong> the dog and wagon together is 45 kg. The wagon<br />
accelerates at 0.85 m/s 2 . What force is the boy<br />
pulling with?<br />
F = ma
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
Practice Problems<br />
A little boy pushes a wagon with his dog in it. The<br />
mass <strong>of</strong> the dog and wagon together is 45 kg. The<br />
wagon accelerates at 0.85 m/s 2 . What force is the<br />
boy pulling with?<br />
F = ma<br />
F= 45 kg x 0.85 m/s 2
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
Practice Problems<br />
A little boy pushes a wagon with his dog in it. The<br />
mass <strong>of</strong> the dog and wagon together is 45 kg. The<br />
wagon accelerates at 0.85 m/s 2 . What force is the<br />
boy pulling with?<br />
F = ma<br />
F= 45 kg x 0.85 m/s 2<br />
F = 38.25 N
<strong>Newton's</strong> <strong>2nd</strong> <strong>Law</strong> <strong>of</strong> <strong>Motion</strong><br />
A force <strong>of</strong> 50 N is applied to an object which causes it<br />
to accelerate across a surface. The object encounters<br />
10 N <strong>of</strong> friction. Use the diagram to determine the<br />
normal force, the mass, the acceleration and the net<br />
force on the object.<br />
Normal force = _______ N<br />
Friction = 10 N<br />
Applied force = 50 N<br />
mass = ______ kg<br />
acceleration = _____ m/s 2<br />
Net force = _____ N<br />
Force <strong>of</strong> gravity = 80 N
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