Changing speed
I can describe how the speed of an object changes throughout the time that a resultant force is acting on it.
Changing speed
I can describe how the speed of an object changes throughout the time that a resultant force is acting on it.
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Lesson details
Key learning points
- A resultant force can change the speed of an object.
- The speed of an object changes throughout the time a resultant force is acting on it.
- The greater the gradient (steeper the line) on a distance-time graph, the faster the movement.
Keywords
Resultant force - The overall effect of a set of forces acting on an object.
Speed - A measurement of how fast something is moving, found from the distance travelled divided by the time taken.
Dynamics trolley - A small wheeled cart used in motion experiments.
Acceleration - A change in speed or direction of movement.
Common misconception
Pupils can think that change in speed is instantaneous due to forces, not over a period of time.
Demonstrate that objects continue to accelerate while the force is acting. Make the force easy to understand (e.g. a pulling string).
To help you plan your year 8 science lesson on: Changing speed, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 8 science lesson on: Changing speed, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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Explore more key stage 3 science lessons from the Moving by force unit, dive into the full secondary science curriculum, or learn more about lesson planning.
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Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
The sum of forces on an object, accounting for direction.
The steepness of a line on a graph.
Distance divided by time.
A wheeled device used in motion experiments.
A change in speed.
