Newton’s 2nd Law of Motion

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Presentation transcript:

Newton’s 2nd Law of Motion Force Mass Acceleration

Professor Mac Explains Newton’s 2nd Law http://www.youtube.com/watch?v=-KxbIIw8hlc

Newton’s 2nd Law of Motion Newton's 2nd Law: states that the acceleration of an object depends on its force and mass. F=M x A (force)=(mass) x (acceleration) So depending on its mass and force, you will get the acceleration. The more mass the acceleration decreases, the more force the faster acceleration. Example: It would be a lot easier for an adult to push a full shopping cart rather than a child.

F = m x a Mass (m) = kg =kilograms Acceleration (a)=m/s² =meters per second squared Force (F)=kg•m/s²=kilograms x meters per seconds squared Newton= N= the unit of for force, and represents kg•m/s² Named after Isaac Newton 1N=the force required to accelerate 1 kg of mass at 1 meter per second.

Sample Problem A 52kg water skier is being pulled by a speedboat. The force causes her to accelerate at 2m/s². Calculate the net force that causes this acceleration. F=m x a m=52kg a= 2m/s² F=52kg x 2m/s² F= 104 kg x m/s² or 104 N The answer tells you that a force of 104 N is required to accelerate the water-skier. This is not a large force, but it does not include the force that overcomes friction.

Changes in Force and Mass Acceleration: means to change speed acceleration = Force/mass An increase in Force causes an increase in acceleration So to increase the acceleration of the wagon you can increase the force you use to pull it. You can pull harder

Changes in Force and Mass Another way to change acceleration is to change the mass. An increase in mass causes a decrease in acceleration. A decrease in mass cases an increase in acceleration. To increase acceleration of wagon, you can decrease its mas.

Newton’s 2nd Law: Making it easy for Kids https://www.youtube.com/watch?v=nO7XeYPi2FU

Newton’s 2nd Law of Motion: How do we calculate this force Newton’s 2nd Law of Motion: How do we calculate this force? What is the relationship between net force and acceleration? https://www.youtube.com/watch?v=21xk6qnfvZc