Laws of Motion — Flashcards
Maharashtra Board · Class 9 · Science
25 flashcards for Laws of Motion (Maharashtra Board Class 9 Science) to test yourself on key terms and facts. Sample: "What is motion? Give an example.
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What is motion? Give an example from daily life.
Answer
Motion is the change in position of an object with respect to time and its surroundings. An object is said to be in motion if its position changes with respect to its surroundings. Example: A moving b…
What is the difference between distance and displacement?
Answer
Distance is the total length of the actual path travelled by an object. Displacement is the minimum distance between the starting and finishing points (straight line distance). Distance is always posi…
Define speed and write its formula.
Answer
Speed is the distance travelled by an object in unit time. Formula: Speed = Total distance travelled / Time required. Unit: m/s (SI system) or cm/s (CGS system). Speed is a scalar quantity.
Define velocity and explain how it differs from speed.
Answer
Velocity is the displacement that occurs in unit time. Formula: Velocity = Displacement / Time. Unlike speed, velocity has both magnitude and direction, making it a vector quantity. Speed is related t…
What are the three ways velocity can change?
Answer
Velocity can change by: 1) Changing the speed while keeping direction the same, 2) Changing the direction while keeping speed the same, 3) Changing both speed and direction simultaneously. This is bec…
Distinguish between uniform and non-uniform motion.
Answer
Uniform motion: Object covers equal distances in equal time intervals (constant speed). Non-uniform motion: Object covers unequal distances in equal time intervals (changing speed). Example of uniform…
Define acceleration and write its formula.
Answer
Acceleration is the rate of change of velocity. Formula: a = (v-u)/t, where 'u' is initial velocity, 'v' is final velocity, and 't' is time. Unit: m/s² (SI system). Acceleration is a vector quantity h…
Explain positive, negative, and zero acceleration with examples.
Answer
Positive acceleration: Velocity increases with time (acceleration in direction of motion). Example: A car speeding up. Negative acceleration (deceleration): Velocity decreases with time (acceleration …
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