Download App

Motion — Science STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9ScienceMotion3 Marks
Question
Define acceleration and state its $SI$ unit. For motion along a straight line, when do we consider the acceleration to be:
  1. Positive.
  2. Negative? Give an example of a body in uniform acceleration.
✓

Answer

  1. Acceleration is the rate of the measure of the change in the velocity of the moving object per unit time. Si unit is $ms^{-2} = m/s^2$
  1. The motion of a freely moving body is the example of uniform acceleration.
  2. If the object moving along the line is positive. same direction.
  3. If the object is moving in the opposite way it is negative. opposite direction.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 3 Mark )" from Motion→Motion — all question types→Science STD 9 question papers→Rajasthan Board STD 9 question papers→Rajasthan Board question paper generator→

Similar questions

Find the momentum of a body of mass 100g having a kinetic energy of 20J.
→
List the points of differences between homogeneous and heterogeneous mixtures.
→
What is the basis of selecting the component crops for mixed cropping?
→
A heavy car $A$ of mass $2000\ kg$ travelling at $10\ m/s$ has a head$-$on collision with a sports car $B$ of mass $500\ kg.$ If both cars stop dead on colliding, what was the velocity of car $B?$
→
Name the different types of solutions. Give one example of each.
→
What is the role of epidermis in plants?
→
A weightlifter is lifting weights of mass $200\ kg$ up to a height of $2$ metres. If $g = 9.8\ ms^{-2},$ Calculate:
  1. Potential energy acquired by the weights.
  2. Work done by the weightlifter.
→
Explain why, it is dangerous to jump out of a moving bus.
→
How will you separate a mixture of iron filings and powdered carbon?
→
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
→