Work, Power, and Energy in Physics

What is the unit of measurement for work?

Joule per second (J/s)
Newton-meter (N.m) (correct)
Meter per second (m/s)
Newton (N)

What happens when a force is applied to an object but it does not move?

The object's kinetic energy decreases
Work is done on the object
The object's energy increases
No work is done on the object (correct)

What is the energy associated with the motion of an object?

Potential energy
Kinetic energy (correct)
Thermal energy
Mechanical energy

What happens to the kinetic energy of an object when it performs work on another object?

It decreases (D) Signup and view all the answers

Which of the following is directly proportional to the object's mass and the square of its speed?

Kinetic energy (A) Signup and view all the answers

What is the basis for understanding momentum?

The concept of a massive object possessing more kinetic energy than a lighter object (B) Signup and view all the answers

What happens to the kinetic energy of a roller coaster as it descends?

Increases (A) Signup and view all the answers

What is the fundamental principle behind the transfer of energy from one object to another?

Energy is neither created nor destroyed, but only changes from one form to another or from one body to another (C) Signup and view all the answers

What type of force is responsible for the potential energy of an object?

Conservative force (C) Signup and view all the answers

What is the condition for the law of conservation of mechanical energy to be applicable?

When only conservative forces act on the system (D) Signup and view all the answers

What is the formula to calculate the gravitational potential energy of an object?

PE = mgh (A) Signup and view all the answers

What is the energy stored in the chemical bonds of different substances?

Chemical Potential Energy (B) Signup and view all the answers

Why is work done when lifting an object from the ground to a higher level?

Because the object is being lifted against the gravitational force of the Earth (B) Signup and view all the answers

What is the potential energy of an object on the ceiling compared to the table?

Negative (C) Signup and view all the answers

What is the unit of the gravitational constant g?

m/s^2 (C) Signup and view all the answers

What is the type of energy present in an object or system due to its temperature?

Thermal Energy (C) Signup and view all the answers

What is the expression of the height (h) in the formula for gravitational potential energy?

It is expressed depending on a specified reference level (D) Signup and view all the answers

What is the energy transformed into when the engine of a car starts to become hot?

Thermal Energy (B) Signup and view all the answers

What is the definition of power in terms of work?

Rate of doing work (D) Signup and view all the answers

What is the SI unit of power?

Joule per second (D) Signup and view all the answers

What is the main reason why trucks are preferred over carabaos for transportation?

Trucks can deliver the same amount of work in a shorter time (D) Signup and view all the answers

Why do some people prefer running as a better exercise for weight loss?

Running does the same amount of work in a shorter time (B) Signup and view all the answers

What happens to the kinetic energy of a falling ball?

It is converted to thermal energy (B) Signup and view all the answers

What is the product of the component of the force in the direction of the object's displacement and the magnitude of the displacement?

Work (A) Signup and view all the answers