Build on measurement skills and explore motion concepts like distance, speed, and different types of motion in more depth.
Using standard instruments and correct technique (like keeping the eye level with the measurement scale) helps avoid errors in measuring length.
Why should you look straight at a ruler's markings rather than at an angle when measuring?
Looking at an angle can cause a reading error called parallax error, giving an inaccurate measurement
What instrument would you use to measure the length of a classroom?
A measuring tape
Distance is the total length of the path travelled by an object. An object is in motion if its position changes over time relative to a fixed point.
If a car travels from home to school and back along the same road, is the total distance the same as if it just went one way?
No, the total distance is double, since distance accounts for the entire path travelled, not just the change in position
How do you know an object is in motion?
Its position changes over time relative to a fixed reference point
1. What error can occur if you don't look straight at a ruler's scale?
2. What instrument would you use to measure a long distance like a football field?
3. What defines whether an object is in motion?
4. If someone walks 5m forward and then 5m back, what is the total distance travelled?
5. Why is a standard unit important when measuring distance?