Newton's First Law of Motion: Inertia and Forces
Understanding the concept of inertia in motion, the role of forces in maintaining or changing motion, and analyzing net forces applied to objects. Also explores scenarios where forces are balanced or unbalanced, affecting the motion of objects.
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Science 8 Chapter 2-The Laws of Motion Newton s First Law Lesson 2
1. What causes an object in motion to remain in motion? A. friction B. inertia C. gravity D. velocity
1. What causes an object in motion to remain in motion? A. friction B. inertia C. gravity D. velocity
2. Extend Three people push a piano on wheels with forces of 130 N to right, 150 N to left, and 165 N to the right. What are the strength and direction of the net force on the piano? Draw a diagram.
130 N to the right 130 N to the right 150 N to the left 150 N to the left 165 N to the right 165 N to the right
Force to the right135 + 160 = 295 N to the right Force to the left = 150 N to the left Net force= 145N to the right
Assess A child pushes down on a box lid with a force of 25 N. At the same time, her friend pushes down on the lid with a force of 30 N. The spring on the box lid pushes upward with a force of 60 N. Can the children close the box? Why or why not? Draw a diagram.
The spring on the box pushes 60 N upward. Child pushes down 25 N. Friend pushes down 30 N. 25 N + 30 N ? 60 N 25 N + 30 N < 60 N No, the children can not push the lid down! Not enough force!
Analyze What is the missing force? 135 N ? N Net force 25 N
Analyze What is the missing force? 135 N ? N Net force 25 N 135 N + ? N = 25 N To the left or -110 N 110 N
5. Use the information in the diagram to complete the equation and determine the net force on the object. The reference direction is to the right. 100 N 55 N ____________ N + _________________ N = _________________ N net force
5. Use the information in the diagram to complete the equation an determine the net force on the object. The reference direction is to the right. 100 N 55 N 100 N + -55 N = 45 N net force
