Newton’s 2nd Law of Motion

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Presentation transcript:

Newton’s 2nd Law of Motion

Objective 8 Level 3 Students will understand the relationship between mass, net force and acceleration and can use this understanding to predict the behavior of an object under the influence of one or several forces. Level 2 Can recall Newton’s 2nd Law. General understanding of relationship between net force / mass and acceleration.

Acceleration- change in velocity over time Change the speed or direction How do we do this??

Acceleration is caused by a FORCE Acceleration is always in the same direction of the net force

Acceleration and Force are Directly Proportional! Directly Proportional- what ever one quantity does, the other one does the same! Double the force, I _________ the acceleration Half the force, I __________ the acceleration

Acceleration also depends on mass Acceleration is inversely proportionate to mass I double the mass, I _________ the acceleration

More mass an object has the less acceleration Acceleration ~1/ mass Acceleration is inversely proportionate to mass

Newton’s 2nd law The acceleration produced by a net force on an object is directly proportional to the net force, is in the same direction as the net force and is inversely proportional to the mass of an object https://www.youtube.com/watch?v=gkcidRnzGfc F=ma

In other words: The larger the net force, the bigger the acceleration. Acceleration and net force are always in the same direction. The larger the mass the smaller the acceleration.

Practice Problems Consider a 1000kg car pulled by a cable with 2000N of force. What would be the acceleration?

One more problem If a mass of 5kg is moving at an acceleration of 3 m/s2, what is the force?