Calculating KE and GPE

Front

What is the acceleration due to gravity on Earth?

Back

9.8 m/s²

Front

How is gravitational potential energy (GPE) calculated?

Back

GPE = mass (kg) × gravity (9.8 m/s²) × height (m)

Front

What is the gravitational potential energy of a 100 kg object at a height of 10 m?

Back

GPE = 100 kg × 9.8 m/s² × 10 m = 9800 J

Front

What is the formula for calculating kinetic energy (KE)?

Back

KE = 0.5 × mass (kg) × velocity² (m/s)²

Front

Calculate the kinetic energy of a 2 kg object moving at 30 m/s.

Back

KE = 0.5 × 2 kg × (30 m/s)² = 900 J

Front

What is the gravitational potential energy of a 2 kg apple hanging 10 m off the ground?

Back

GPE = 2 kg × 9.8 m/s² × 10 m = 196 J

Front

Which has greater gravitational potential energy: a 100 kg wrecking ball at 10 m or a 50 kg object at 20 m?

Back

100 kg wrecking ball at 10 m has greater GPE (1000 J vs 9800 J).

Front

What factors affect gravitational potential energy?

Back

Mass, height above ground, and acceleration due to gravity.

Front

What is the unit of measurement for energy?

Back

Joule (J)

Front

If an object is dropped from a height, what happens to its potential energy?

Back

It decreases as it falls and is converted to kinetic energy.