Advertisements
Advertisements
Question
In the case of negative work, the angle between the force and displacement is
Options
0°
45°
90°
180°
Advertisements
Solution
180°
Explanation:
Work done is negative when a force acts opposite to the direction of displacement, i.e. the angle between the two directions is 180°.
APPEARS IN
RELATED QUESTIONS
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.
What kind of energy is possessed by the following?
A running car ____________
What kind of energy is possessed by the following?
A stretched rubber band _____________
Name the device or machine which convert :
Electrical energy into light energy.
Name the device or machine which convert :
Chemical energy into heat energy.
Name the energy transfers which occur when :
an electric ball rings
How much energy does a 100 W electric bulb transfer in 1 minute?
The device which converts mechanical energy into energy which runs our microwave oven is :
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m s–2)
