Newton's Second Law
Grade 8 · Science · Forces and Motion · Northwest Territories, Canada
Lesson Summary
Force equals mass times acceleration (F = ma).
Explanation
Newton's second law says that the acceleration of an object depends on the net force acting on it and its mass. The formula is F = ma, where F is force measured in Newtons, m is mass in kilograms, and a is acceleration in meters per second squared. A heavier object needs more force to accelerate at the same rate as a lighter one. This law connects the ideas of force, mass, and acceleration into one simple equation.
Practice Questions
Q1: What force is needed to accelerate a 10 kg object at 3 m/s²?
Answer: 30 Newtons. F = ma = 10 × 3 = 30 N.
Q2: If you push a shopping cart and a loaded truck with the same force, which accelerates more?
Answer: The shopping cart, because it has less mass and therefore accelerates more with the same force.
Q3: A 5 kg box is pushed with a force of 20 N. What is its acceleration?
Answer: 4 m/s². a = F/m = 20/5 = 4 m/s².
People Also Ask
What is Newton's Second Law in Grade 8 Science?+
Newton's Second Law is a lesson in the Forces and Motion chapter of Grade 8 Science. It is part of the Northwest Territories, Canada school curriculum and covers key concepts that students need to understand at this level.
What grade level covers Newton's Second Law?+
Newton's Second Law is taught in Grade 8 as part of the Science curriculum in Northwest Territories, Canada.
How can I help my child with Forces and Motion in Science?+
Start with the lesson summary and explanation on this page. Practice the questions provided, then use TutorTom for personalized, step-by-step help with Forces and Motion topics.