Conservation Of Energy Flashcards | A-Level Physics CIE

What are the units for kinetic energy?

Joules (J)

Answer in your head, out loud, or on paper, then tap the card to flip.

What is kinetic energy?

The kinetic energy of an object is the energy that it possesses due to its motion.

Answer in your head, out loud, or on paper, then tap the card to flip.

Which two measurements are required to calculate the kinetic energy of an object?

The mass and velocity of the object.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the formula for kinetic energy (E_k)?

Ek = 21 × m × v2

E_k = kinetic energy (J)

m = mass (kg)

v = speed (ms^-1)

Answer in your head, out loud, or on paper, then tap the card to flip.

What happens to the gravitational potential energy of an object as it falls?

The gravitational potential energy of an object decreases as it falls.

Answer in your head, out loud, or on paper, then tap the card to flip.

What happens to the kinetic store of a ball that rolls down a hill?

The kinetic store of the ball will increase as the gravitational potential energy is transferred to the kinetic store.

Answer in your head, out loud, or on paper, then tap the card to flip.

A ball is thrown upwards in the air.

What happens to the gravitational potential and kinetic energy stores of the ball?

Gravitational potential energy increases and kinetic energy decreases.

Answer in your head, out loud, or on paper, then tap the card to flip.

What happens to the kinetic store of a ball as it falls through the air?

The kinetic store of the ball increases as it falls towards the ground.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the formula linking gravitational potential energy ( $\Delta$ E_p), mass (m), gravitational field strength (g) and height ( $\Delta$ h)?

ΔEp = m x g x Δh

$\Delta$ E_p= gravitational potential energy (J)

m = mass (kg)

g = gravitational field strength (ms^-2)

$\Delta$ h = height (m)

Answer in your head, out loud, or on paper, then tap the card to flip.

What is the conservation of energy law?

Energy can be transferred usefully, stored, or dissipated, but can never be created or destroyed.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is dissipated energy?

Energy that is lost to the surroundings.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is an open system?

An open system is one which can gain or lose energy (or matter) to the 'outside world'.

Answer in your head, out loud, or on paper, then tap the card to flip.

What is a closed system?

A closed system is one which cannot gain or lose energy (or matter) to the 'outside world'.

Answer in your head, out loud, or on paper, then tap the card to flip.