Potential Energy and Work Done Quiz

What is the relationship between work done and the change in kinetic energy of an object?

They are equal (correct)
Work done is greater than the change in kinetic energy
They are inversely proportional
There is no relationship between them

If an object of mass 15 kg is moving with a uniform velocity of 4 m/s, what is its kinetic energy?

60 J
40 J (correct)
16 J
30 J

When the velocity of an object is doubled, what happens to its kinetic energy?

Halves
Doubles
Quadruples (correct)
Remains the same

What is the kinetic energy possessed by an object of mass 1500 kg moving at a velocity of 50/3 m/s?

$625000/3$ J (B) Signup and view all the answers

When the velocity of an object is increased three times, what happens to its kinetic energy?

Increases by 9 times (A) Signup and view all the answers

What happens to a rubber band when stretched and then released?

It regains its original length (B) Signup and view all the answers

What type of energy is transferred to an object when a rubber band is stretched?

Potential energy (A) Signup and view all the answers

When winding the key of a toy car, the energy transferred to the spring inside is stored as:

Potential energy (B) Signup and view all the answers

What kind of energy is possessed by an object due to its position or configuration?

Potential energy (D) Signup and view all the answers

If you lift an object to a greater height, what happens to the amount of work it can do?

It can do more work (A) Signup and view all the answers

What happens when a stretched rubber band is released?

It returns to its original shape (C) Signup and view all the answers

In the scenario with the slinky, would the slinky acquire potential energy if compressed instead of stretched?

No, it would not acquire any energy (C) Signup and view all the answers

What is the unit of work when a force of 1 N displaces an object by 1 m along the line of action of the force?

Newton metre (N m) (C) Signup and view all the answers

When the force on an object is zero, what is the work done?

0 J (D) Signup and view all the answers

If an object is displaced by 0 m, what would be the work done?

0 J (A) Signup and view all the answers

In which scenario is work done negative according to the explanation provided?

Force is opposite to the direction of displacement (A) Signup and view all the answers

What is the work done by a force of 7 N on an object displaced by 8 m in the direction of the force?

56 J (A) Signup and view all the answers

In lifting an object upwards, which force does positive work according to the example?

Force exerted by you (D) Signup and view all the answers

Which of the following is a correct definition of power?

Power measures the speed of work done. (B) Signup and view all the answers

If an agent does a work W in time t, how is power calculated?

$\frac{W}{t}$ (A) Signup and view all the answers

What is the basis for classifying machines like motorbikes and motorcars?

Their speed of changing energy or doing work (B) Signup and view all the answers

If two children of the same weight climb up a rope separately and reach a height of 8m, what are they primarily demonstrating?

Work (B) Signup and view all the answers

Why is it important for nature to allow the transformation of energy?

To conserve energy (A) Signup and view all the answers

How is power defined in the context of agents transferring energy?

$\text{Power} = \frac{\text{work}}{\text{time}}$ (A) Signup and view all the answers

What is the formula to calculate power in physics?

$P = \frac{\text{Force} \times \text{Distance}}{\text{Time}}$ (B) Signup and view all the answers

What is the SI unit of power?

Watt (D) Signup and view all the answers

If a lamp consumes 500 J of energy in 5 s, what is its power?

250 W (B) Signup and view all the answers

What is the definition of average power?

Total work done divided by total time taken (D) Signup and view all the answers

Which formula can be used to calculate power when weight and height are given?

$P = \frac{\text{Weight} \times \text{Height}}{\text{Time}}$ (D) Signup and view all the answers

What is work done on an object defined as?

Force multiplied by distance moved in the direction of the applied force (B) Signup and view all the answers