|
substances
|
Densities (Kg/m3)
|
|
Water
|
1000
|
|
Ice
|
917
|
|
Kerosene
|
800
|
|
Oil
|
820
|
|
Air
|
1.2
|
N.B;
- Any liquid that floats on water has a smaller density compared to that on water
- Any object that has a density greater than that of water, sinks in water
- Speed ;
The speed of an object is its distance moved per unit time. It is measured in meters per seconds (m/s).
Speed= distance covered
Time taken
- Velocity ;
The velocity of an object is its displacement per unit time. It is also measured in meters per seconds (m/s).
Velocity= displacement
Time
Example;
If a car moves a distance of 50m in 10seconds (s), find the speed of the car.
Speed= 50m =5m/s
10s
- Acceleration
The acceleration of an object is the change in it velocity per unit time. It is measured in m/s2.
Acceleration = change in velocity
Time taken
