Balanced forces and inertia explain why an object can remain at rest or continue moving without a forward push. This Grade 7 Science worksheet explores net force, Newton’s first law, and free-body diagrams through familiar examples such as a book resting on a table and a cart rolling across a surface. Students examine the difference between balanced forces and the unbalanced forces that change motion.

From net force to everyday motion

The reading passage introduces balanced forces as equal forces acting in opposite directions, producing a net force of zero. Students connect this idea to objects at rest and objects moving at constant speed in a straight line under an ideal low-friction model. The lesson also explains inertia, an object's tendency to resist changes in its motion, and relates it to Newton’s first law.

Free-body diagrams help students identify the pushes and pulls acting on a single object. A book on a table provides an example of gravity balanced by the table’s support force. A rolling cart illustrates why motion does not require a continuous forward resultant force and how friction can make the forces unbalanced, causing the cart to slow down.

Apply the concepts and explain the evidence

Students work through multiple-choice questions, true-or-false statements, short written responses, matching pairs, and a cloze passage. An extended-response task challenges them to evaluate the claim that a moving cart needs a forward force at all times. Students must use balanced forces, net force, inertia, friction, and the ideal low-friction model to support their explanation. A Did You Know feature adds a further point of interest.

This combination of conceptual checks and written reasoning gives students opportunities to distinguish force from motion, interpret simple free-body diagrams, and explain when a resultant force changes an object's movement. The emphasis is on using scientific vocabulary accurately and applying the ideas to concrete situations rather than memorising definitions alone.

Resources included for teaching and review

• Student worksheet: Reading and practice focused on balanced forces, inertia, net force, and motion.
• Separate answer key PDF: Helps teachers check responses and review students’ explanations.
• Student Notes & Lesson Summary: A supplementary resource for consolidating the central concepts.
• Separate Teacher Guide PDF: Provides Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes to support lesson preparation.

Use in a Grade 7 motion unit

Use this balanced forces practice as a lesson follow-up, independent classwork, or a review of motion and forces. Students can first read the explanation, then apply the ideas to examples and finish by defending a claim about a moving cart. Their responses can help identify misconceptions, especially the belief that an object must always have a forward force to keep moving.

Designed for the Texas Science 7 topic of Motion and Thermal Energy within the stated TEKS framework, this resource brings force diagrams, inertia, and friction together in one focused lesson package.