Gravity (GCSE Physics)

Why does the gravitational potential energy of an object at height h depend on the choice of reference level (zero height)?

A soccer ball is kicked straight up with speed 20 m/s. Neglecting air resistance, how long will it take to return to its starting height? (Use g = 10 N/kg for quick estimate.)

How does gravitational field strength vary with distance r from a point mass M (qualitative)?

Which of these factors will reduce your weight reading on a bathroom scale?

If you double the height through which a mass is lifted, what happens to the change in its gravitational potential energy (assuming constant mass and g)?

Which quantity remains the same for an object lifted slowly from Earth’s surface to a higher location: its mass, weight, gravitational potential energy, or all three?

Which situation gives the largest gravitational field strength at a point near the surface?

Which of the following best explains why astronauts feel weightless in orbit?

Which formula gives the gravitational force between two point masses m1 and m2 separated by distance r (Newton’s law of universal gravitation)?

Two balls of the same size but different masses are dropped from the same height in a vacuum. Which will hit the ground first?

Which statement about the Moon’s gravitational field is true compared with Earth’s?