LONGOS NATIONAL HIGH SCHOOL GRADE 8 SCIENCE – MODULE 1 ENRICHMENT ACTIVITY Name: ____________________________ Grade and Section: _____________________ Score: ___________ Newton’s Second Law of Motion: Law of Acceleration If the net force acting on an object is constant, its velocity changes at a constant rate over time. Hence, it is considered to be moving with constant acceleration. But if the force acting on the object is changed, its acceleration will also change. When the net force is doubled, acceleration is also doubled. When it is tripled, acceleration is also tripled. We can therefore say that at constant mass, the acceleration of an object is directly proportional to the magnitude of the unbalanced force F acting on it. Acceleration also varies with the mass of the object. As the mass of the object increases, with the same amount of force applied, its acceleration decreases. This can be expressed in equation form as: Fnet= ma 1Newton (N) = 1kg x m/s2 Law of Acceleration “The acceleration of an object is directly proportional to the magnitude of the net force acting on it and is inversely proportional to its mass.” ACTIVITY: LETS DO THE MATH Direction: Use Newton's second law equation to solve for force, mass, and acceleration. Problem 1- A ball with a mass of 0.5 kg is hit with a force of 2.5N. What is its acceleration? ________________________________________________________________________ Problem 2- What is the acceleration of a 15kg box that is pushed across a horizontal surface with a force of 50N? _______________________________________________________ Problem 3- An object with a mass of 2.0 kg has a force of 5.0 N applied to it. What is the resulting acceleration of the object? ___________________________________________ Problem 4- An object with a mass of 3.0 kg accelerates 2.5 m/s2 when an unknown force is applied to it. What is the amount of the force? ___________________________________ Problem 5- An object accelerates 12.0 m/s2 when a force of 6.0 N is applied to it. What is the mass of the object?_____________________________________________________
