Topic 3 - Conservation Of Energy - Energy

Question 1

What does AGPE stand for?

Answer 1

AGPE = change in gravitational potential energy

AGPE is calculated using the formula: mgAh.

Question 2

What is the formula to calculate the change in gravitational potential energy?

Answer 2

Change in GPE (J) = mass (kg) x gravitational field strength (N/kg) x change in vertical height (m)

GPE is measured in joules (J).

Question 3

What does KE represent in physics?

Answer 3

KE = kinetic energy

Kinetic energy is associated with the motion of an object.

Question 4

How is kinetic energy calculated?

Answer 4

Kinetic energy (J) = ½ x mass (kg) x (speed)^2 (m/s)

Speed must be squared in the kinetic energy formula.

Question 5

Fill in the blank: The equation for change in gravitational potential energy is AGPE = mgh, where ‘g’ represents _______.

Answer 5

gravitational field strength

Gravitational field strength is measured in newtons per kilogram (N/kg).

Question 6

True or False: Kinetic energy can be negative.

Answer 6

False

Kinetic energy is always a positive value since it depends on mass and the square of speed.

Question 7

What units are used to measure kinetic energy?

Answer 7

Joules (J)

Kinetic energy is always expressed in joules.