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Newton’s Second Law Newton’s second law of motion explains how The total force on an object is equal to its This is shown as: If you are looking for acceleration, the equation is: What does our circle equation look like? Newton’s Second Law Newton’s second law of motion explains how Force, Mass, and Acceleration are related. The total force on an object is equal to its acceleration and its mass multiplied together. This is shown as: F=mxa If you are looking for acceleration, the equation is: a=F/m What does our circle equation look like? F m a Sample Problems 1.)A 52kg water-skier is being pulled by a speedboat. The force causes her to accelerate at 2 m/s/s. Calculate the net force that cause this acceleration. 2) What is the mass of an elevator, which has a 2000N force applied to it to accelerate it at 2m/s/s? Sample Problems 3.)Suppose you know the acceleration of a shopping cart as it rolls down the aisle. You want to find the total (or net) force with which it was pushed. What other information do you need in order to find the force? 4) Suppose you double the force acting on an object. In what way could you change the mass to keep its acceleration unchanged? Sample Problems 5) What is the acceleration of a 55 kg cart being pushed with a force of 825N? Sample Problems 1.)A 52kg water-skier is being pulled by a speedboat. The force causes her to accelerate at 2 m/s/s. Calculate the net force that cause this acceleration. Force = Mass x Acceleration F = 52 kg x 2 m/s/s F = 104 kg-m/s/s F = 104 N 2) What is the mass of an elevator, which has a 2000N force applied to it to accelerate it at 2m/s/s? m=F/a m = 2000N / 2 m/s/s m = 1000 kg Sample Problems 3.)Suppose you know the acceleration of a shopping cart as it rolls down the aisle. You want to find the total (or net) force with which it was pushed. What other information do you need in order to find the force? Mass of the shopping cart 4) Suppose you double the force acting on an object. In what way could you change the mass to keep its acceleration unchanged? If the total force is doubled, you have to double the mass of the object to keep the acceleration unchanged. Sample Problems 5) What is the acceleration of a 55 kg cart being pushed with a force of 825N? F=mxa a=F/m a = 825N / 55 kg a = 15 m/s/s