Grand STEM Challenge 2022 for Physics - Preliminary Competition

The unit for energy is

Who introduced the word "energy"?

• Thomas Young

• Gottfried Wilhelm Leibniz

• Albert Einstein

• James Prescott Joule

______ is defined as the capacity to do work.

• Force

• Energy

• Power

• Momentum

Identify the forms of energy relevant to the picture.

I Kinetic energy

II Potential energy

III Thermal energy

IV Radiation energy

V Nuclear energy

VI Chemical energy

• III & IV

• III, IV, V & VI

• I, II & III

• III, IV & V

A car is moving at a constant speed of 110 km/h, with kinetic energy 800 kJ. Find its mass.

• 1.322 kg

• 1714 kg

• 1.714 kg

• 1322 kg

• 1996 kg

Pick the correct statement about the pendulum in the picture.

• Potential energy is maximum at point 3

• Kinetic energy is maximum at point 5

• Kinetic energy is maximum at point 4

• Kinetic and potential energy are the same at point 2

• Potential energy is converted to kinetic energy when going from point 3 to point 5

When the green ball is squeezed, it gains

• heat energy

• kinetic energy

• potential energy

• chemical energy

• no energy

Energy cannot be created or destroyed, but can be transferred from one form to another.

The statement above refers to

• Newton's 1st Law of Motion

• 1st Law of Thermodynamics

• Principle of conservation of momentum

• None of the given option is correct

• Principle of conservation of kinetic energy

Answer explanation

Kinetic energy is generally not conserved when work is done but the total energy is.

1st Law of Thermodynamics is indeed a statement about the total energy being conserved, it's just that it is usually applied to the case of thermal and internal energy.

The mass of an oxygen molecule is ______ the total mass of two oxygen atoms.

• more than

• less than

• same as