Quiz on Work and Energy

Work is done by a force if ...

• The object moves in the direction of the force

• The object experiences acceleration

• The object moves, but not in the direction of the force

• There is no displacement

• The force does not cause displacement

The unit of work in SI is ...

• Newton

• Joule

• Kilogram

• Meter

• Watt

No work is done if ...

• The force is in the direction of the displacement

• The force is opposite to the direction of the displacement

• The force is perpendicular to the displacement

• The force is proportional to the displacement

• The displacement is very small

The work done by a force of 50 N on an object that moves 4 meters is ...

• 50 Joule

• 100 Joule

• 150 Joule

• 200 Joule

• 250 Joule

The maximum potential energy is possessed by an object when ...

• The object is above the ground

• The object is at the highest altitude

• The object is moving at high speed

• The object is at rest

• The object is in free fall

The law of conservation of energy states that ...

• Energy always increases over time

• Energy can change forms but cannot be created or destroyed

• Energy cannot change forms

• Energy always decreases in every process

• The total energy of an object is always zero

Power is defined as ...

• Work done per unit time

• Work done on a stationary object

• Energy possessed by a moving object

• Force applied by an object on a surface

• Work done without displacement

An object with a mass of 2 kg falls freely from a height of 5 meters. The gravitational potential energy of the object at that height is ... (g = 10 m/s²)

• 5 Joule

• 10 Joule

• 50 Joule

• 100 Joule

• 200 Joule

In a closed system without external forces, mechanical energy ...

• Always increases

• Always decreases

• Is constant

• Can be lost

• Does not have a definite value

The kinetic energy of an object doubles if ...

• The mass of the object is halved

• The speed of the object is doubled

• The force acting on the object is reduced

• The object moves at a constant speed

• The force applied to the object remains constant