science
Grade-7
Easy

Question

Match the following and choose the option with all the right matches:
i
Positive acceleration
a
Slowing down
ii
Negative acceleration
b
Uniform motion
iii
Zero acceleration
c
The motion of a running athlete
iv
Non-uniform acceleration
d
Speeding up

  1. i—d, ii —a, iii —b, iv —c
  2. i—c, ii —a, iii —b, iv —d
  3. i—d, ii —b, iii —a, iv —c
  4. i—b, ii —d, iii —a, iv —c

hintHint:

Acceleration = change in velocity / time taken.

The correct answer is: i—d, ii —a, iii —b, iv —c


    • An object is said to be in positive acceleration when its speed is increasing continuously. 
    • while an object will be in negative acceleration when its speed is reducing or in the opposite direction. 
    • In uniform motion there is no change in velocity hence the acceleration is also zero.
    •  The motion of a running athlete is a non-uniform motion as he may not covers equal distance in equal interval of time.

    Acceleration is a vector quantity

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