Advanced Physics Chapter 4 Motion and Force: Dynamics.
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Transcript of Advanced Physics Chapter 4 Motion and Force: Dynamics.
Advanced Physics
Chapter 4Motion and Force: Dynamics
Chapter 4
4-1 Force 4-2 Newton’s First Law of Motion 4-3 Mass 4-4 Newton’s Second Law of Motion 4-5 Newton’s Third Law of Motion 4-6 Weight-the Force of Gravity and the
Normal Force 4-7 Solving Problems with Newton’s Laws 4-8 Applications Involving Friction and Inclines 4-9 Problem Solving
4-1 Force
Force• a push or a pull
4-2 Newton’s First Law of Motion
Newton’s First Law of Motion
Net Force• Vector sum of all
forces acting on an object
Inertia• Tendency of a body to
maintain its state of motion
4-2 Newton’s First Law of Motion
Inertial vs. non-inertial reference frames
a
4-3 Mass
Mass vs. Weight
4-4 Newton’s Second Law of Motion
Newton’s Second Law of Motion Force
• An action capable of accelerating an object (N)
equation:
F = ma
4-5 Newton’s Third Law of Motion
Newton’s Third Law of Motion
4-5 Newton’s Third Law of Motion
Net Force Action-Reaction
Force
4-6 Weight-Force of Gravity and Normal Force
Weight (Fg)• Force of gravity on an
object Contact Force Normal Force (Fn)
• Contact force that acts perpendicular to the surface of contact
Are Fg and Fn action-reaction forces?
Does anyone remember the five forces equation?
(4-7)
4-7 Solving Problems with Newton’s Laws
Free-Body (force) diagram• Five forces
Tension• The force exerted
when a flexible cord pulls on an object
4-7 Solving Problems with Newton’s Laws
Problem solving: If 150 N of
upward force is applied to a 35 kg object calculate its rate of acceleration
150 N
4-8 Applications involving Friction, Inclines
Kinetic (sliding) Friction• Friction that
opposes the motion of two objects in contact and in relative motion
4-8 Applications involving Friction, Inclines
Static Friction• Friction that
opposes the motion of two objects in contact and NOT in relative motion
4-8 Applications involving Friction, Inclines
Coefficient of friction ()• Depends on the
nature of two surfaces
= Ff Fn
• ROT s > k
4-8 Applications involving Friction, Inclines
Inclined Planes Find the force of
friction that acts on a 35 kg box that sits on a 25 inclined plane.
4-8 Applications involving Friction, Inclines
Inclined Planes Find the force of
friction that acts on a 35 kg box that sits on a 25 inclined plane.
Answer: 145N
4-9 Problem Solving-A General Approach
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