Lesson Plan: Friction

Grade Level: Primary Year 4

Objective: Students will be able to understand the concept of friction and how it affects motion. They will also be able to identify ways to increase and decrease friction.

Materials: - Various objects with different textures (e.g. sandpaper, rubber, metal, plastic) - Wooden blocks - Ramp - Stopwatch - Worksheet

Introduction: 1. Begin by asking students if they have ever tried to slide something across a surface and it wouldn’t move. Ask them why they think this happened. 2. Introduce the concept of friction and explain that it is the force that opposes motion between two surfaces that are in contact. 3. Show examples of friction in everyday life, such as walking, riding a bike, or using brakes on a car.

Activity 1: Increasing Friction 1. Divide students into groups of 3-4. 2. Provide each group with a wooden block and various objects with different textures. 3. Instruct students to place the wooden block on a flat surface and try to slide it using each of the objects. 4. Have students record their observations on the worksheet, noting which objects increased friction and which did not.

Activity 2: Decreasing Friction 1. Provide each group with a ramp and a wooden block. 2. Instruct students to time how long it takes for the wooden block to slide down the ramp. 3. Have students repeat the experiment, but this time, place sandpaper on the ramp to increase friction. 4. Have students record their observations on the worksheet, noting how the sandpaper decreased friction and affected the time it took for the block to slide down the ramp.

Conclusion: 1. Review the concept of friction and how it affects motion. 2. Ask students to share their observations from the activities and discuss ways to increase and decrease friction. 3. Have students complete the worksheet as an assessment of their understanding of the lesson.

Assessment: Students will complete a worksheet that includes questions about the concept of friction and ways to increase and decrease it. The worksheet will be used to assess their understanding of the lesson.