Project work Class 9th
Q.2= Group the following substances into elements or compounds:
Potassium, lime water, sulphur, washing soda,carbon, lead,vinegar.
Q.3= If the K shell of an atom are full and the M shell has 2 electrons then what is the atomic number of the atom?
Q.4= Define uniform motion and a non-uniform motion also state two example of each.
Q.5= A fire extinguisher is hurt by a rubber pipe that throws water at a very high speed. Explain this.
Answers
Explanation:
Q2.
Elements - potassium, sulphur,lead,carbon
Compounds - lime water, washing soda, vinegar
Q3.
The atomic number is 12 (magnesium)
Q4.
Uniform Motion -This type of motion is defined as the motion of an object in which the object travels in a straight line and its velocity remains constant along that line as it covers equal distances in equal intervals of time, irrespective of the duration of the time.
eg .If the speed of a car is 10 m/s, it means that the car covers 10 meters in one second. The speed is constant in every second.
Non Uniform Motion - This type of motion is defined as the motion of an object in which the object travels with varied speed and it does not cover same distance in equal time intervals, irrespective of the time interval duration.
Eg. If a body is involved in rectilinear motion, and if the motion is not consistent, then the acceleration of the body must be non-zero.
Q5. This happens because of Newton's Second Law of Motion
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