Physics (9-1) - 0972 CIE

Motion

Bayani Gaba-gaba

Everything around you is either moving or could be set moving, and physics begins by describing that motion precisely. How fast is a sprinter going? Is a car speeding up or slowing down? How far does a dropped stone fall in two seconds? Every one of these questions is answered with a handful of equations and two simple graphs.

In this lesson you will define speed, velocity and acceleration, then read and draw distance-time and speed-time graphs with confidence. You will calculate speed from a gradient, distance from an area, and handle free fall and terminal velocity. By the end you should be able to look at a graph and tell its whole story.

Manufura

Define speed as distance travelled per unit time; recall and use the equation s v = t
Define velocity as speed in a given direction
Recall and use the equation total distance travelled average speed = total time taken
Sketch, plot and interpret distance-time and speed-time graphs
Determine, qualitatively, from given data or the shape of a distance-time graph or speed-time graph when an object is: (a) at rest (b) moving with constant speed (c) accelerating (d) decelerating
Calculate speed from the gradient of a straight- line section of a distance-time graph
Calculate the area under a speed-time graph to determine the distance travelled for motion with constant speed or constant acceleration
State that the acceleration of free fall g for an object near to the surface of the Earth is approximately constant and is approximately
[Supplement] Define acceleration as change in velocity per unit time; recall and use the equation ∆v a = ∆t
[Supplement] Determine from given data or the shape of a speed-time graph when an object is moving with: (a) constant acceleration (b) changing acceleration
[Supplement] Calculate acceleration from the gradient of a speed-time graph
[Supplement] Know that a deceleration is a negative acceleration and use this in calculations
[Supplement] Describe the motion of objects falling in a uniform gravitational field with and without air/ liquid resistance, including reference to terminal

Takardar Darasi

Motion is the foundation of mechanics: forces, momentum and energy all build on it. Examiners love motion because it links words, equations and graphs at once. Read a speed-time graph correctly and you can pull out speed, acceleration and distance from a single picture, which is why this topic appears in almost every paper.

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Zazzage manhajar Green Bridge CBT a wayar ka ko kwamfyuta ka don samun cikakkiyar bayanan darasi, tambayoyin aiki, da ƙari.

Cikakkiyar bayanan darasi tare da zane-zane

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Nazarin Darasi

Barka da kammala darasi akan Motion. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

A car travels 150 m in 10 s. Its average speed is: A. 1.5 m/s B. 15 m/s C. 150 m/s D. 1500 m/s Answer: B
On a distance-time graph, a horizontal line means the object is: A. accelerating B. moving at constant speed C. at rest D. decelerating Answer: C
On a speed-time graph, the distance travelled is given by: A. the gradient of the line B. the area under the line C. the highest point D. the time axis intercept Answer: B
A car speeds up from 10 m/s to 30 m/s in 5 s. Its acceleration is: A. 2 m/s2 B. 4 m/s2 C. 6 m/s2 D. 100 m/s2 Answer: B
A skydiver reaches terminal velocity when: A. weight is zero B. drag is zero C. drag equals weight D. the parachute opens Answer: C