Q1
Acceleration is calculated as:
Achange in velocity ÷ time
Bdistance ÷ time
Cvelocity × time
Ddisplacement ÷ velocity
CBSEClass 9 (CBSE)ScienceCh 7 · Topic 2
Equations of Motion and Acceleration
Learning the equations describing uniformly accelerated motion.
Core concept
Acceleration is defined as the rate of change of velocity over time, calculated as a = (v-u)/t, and can be positive (speeding up), negative/deceleration (slowing down), or zero (constant velocity). These equations of motion are widely used in physics problems involving falling objects, vehicles, and projectile motion, and assume acceleration remains constant throughout the motion being analysed — they do not directly apply to motion with continuously changing acceleration.
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• Three equations of motion: v=u+at, s=ut+½at², v²=u²+2as.
• Acceleration = change in velocity ÷ time = (v-u)/t.
• Acceleration can be positive (speeding up), negative (slowing down), or zero (constant velocity).
• Equations of motion assume constant (uniform) acceleration.