Newton’s Laws. The Study of Dynamics. Isaac Newton. Arguably the greatest physical genius ever. Came up with 3 Laws of Motion to explain the observations and analyses of Galileo and Johannes Kepler. Invented Calculus.
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The Study of Dynamics
Aristotle firmly believed this.
But Physics B students know better!
A very commonly used accelerating force is gravity. Here is gravity in action. The acceleration is g.
In the absence of air resistance, gravity acts upon all objects by causing the same acceleration…g.
The pulley lets us use gravity as our accelerating force… but a lot slower than free fall. Acceleration here is a lot lower than g.
Are weight and mass the same thing?
N = applied force
Bigger Applied Force
Bigger Frictional Force
The forces on the book are now UNBALANCED!
Even Bigger Applied Force
Static friction cannot get any larger, and can no longer completely oppose the applied force.
Coefficient of Static Friction
Coefficient of Kinetic Friction
Mass 1 (10 kg) rests on a frictionless table connected by a string to Mass 2 (5 kg). Find (a) the acceleration of each block and, (b) the tension in the connecting string.
Mass 1 (10 kg) rests on a table connected by a string to Mass 2 (5 kg) as shown. What must the minimum coefficient of static friction be to keep Mass 1 from slipping?
Mass 1 (10 kg) rests on a table connected by a string to Mass 2 (5 kg). If ms = 0.3 and mk = 0.2, what is a) the acceleration and b) the tension in the string?