A machine that works without energy loss is called:

What happens to particle motion when temperature increases?

Gravitational potential energy depends on:

Bilal is holding a heavy book stationary at a height of 1 meter above the ground. He is exerting an upward force, but the book does not move. How much work is Bilal doing on the book?

Ming is studying efficiency. He knows that efficiency is a measure of how well a machine converts input energy to useful output. If a machine has an efficiency of 40%, what percentage of input energy is wasted?

Hina is studying geothermal energy. She knows that geothermal energy is derived from the Earth's internal heat. Which of the following is a source of geothermal energy?

Range of thermometer means:

Yara is studying density. She understands that density is a characteristic property of a substance. Which of the following can be used to identify a pure substance?

Efficiency of a machine is always:

Paula is learning about the range of a thermometer. She understands that range refers to the minimum and maximum temperatures a thermometer can measure. Which factor affects the range of a liquid-in-glass thermometer?

What is density?

Rania is learning about the relationship between particle motion and temperature. She understands that temperature is a measure of average kinetic energy. What is the average kinetic energy of particles at absolute zero?

Khalid is studying tidal energy. He knows that tidal energy is generated by the rise and fall of tides. What causes tides?

Oliver is studying wind energy. He knows that wind turbines convert the kinetic energy of wind into electrical energy. What is the main advantage of wind energy?

Ethan is studying the variation of volume and pressure. He learns that for a fixed mass of gas at constant temperature, pressure is inversely proportional to volume. This is known as:

Bilal is learning about measuring densities. He knows that the density of a regular-shaped object can be found by measuring its mass and volume. Which instrument is used to measure the mass of an object?

Which law states that energy cannot be created or destroyed?

Which of the following is a form of energy?

George is studying energy conversion. He drops a ball from a height of 5 meters. As the ball falls, its potential energy is converted to kinetic energy. What is the kinetic energy of the ball just before it hits the ground? (Assume mass = 1 kg, g = 10 m/s²)

Which energy source causes air pollution?

Waseem is studying the work-energy theorem. He knows that the work done on an object is equal to the change in its kinetic energy. If a force does 500 J of work on an object, what is the change in kinetic energy?

Lower fixed point of a Celsius thermometer is:

Which state of matter has particles very close together?

Xia is studying efficiency. She knows that no machine is 100% efficient because some energy is lost as heat. What happens to the lost energy in a machine?

Yusuf is studying the conservation of energy. He knows that the total energy in an isolated system remains constant. In a swinging pendulum, where is the kinetic energy maximum?

Samir is studying internal energy and temperature. He learns that temperature is not a direct measure of internal energy. Why is temperature not a direct measure of internal energy?

If force is applied but no displacement occurs, the work done is:

Ibrahim is studying wind energy. He knows that wind turbines convert kinetic energy into electrical energy. What is the source of wind energy?

Temperature is a measure of:

Tina is studying power. She knows that power is the rate of doing work. If a machine does 1000 J of work in 2 seconds, what is its power?