'Stone at a height'- which type of energy is related to this situation?
Kinetic energy
Potential energy
Mechanical energy
Electrical energy
The kinetic energy possessed by an objects of mass, m and moving with a uniform velocity v is
K.E = 2 m v2
K.E = 1/2 m v2
K.E = 1/4 m v2
K.E = 4m v2
Unit of work is
Joule
Watt
m/s
N
1 watt =
10 J S-1
1 J S-1
0.1 J S-1
100 J S-1
When the force acts opposite to the direction of displacement
Work done is negative
Work done is positive
Work done is neutral
No work is done
The energy used in households, industries and commercial establishments are usually expressed in
Joules
W
KWh
None of these.
Which one of these objects posses kinetic energy?
A moving bullet
Blowing wind
A rolling stone
All the above
At the start of a freely falling object its kinetic energy is zero. Why ?
Because its velocity is zero
Because mass has no effect at that height
The body is at a height
An object of mass 15 kg is moving with a uniform velocity of 4m s-1.What is the kinetic energy possessed by the object?
120 J
100 J
220 J
200 J
The capacity to do work is
Force
Energy
Momentum
Power
