Weight, mass and gravity

Which of these statements is TRUE?

• Gravity is a force which exists between all objects with mass.

• Gravity is the same strength throughout the universe.

• Gravity causes objects to fall to the Earth at a constant speed.

The more massive an object, the stronger its gravitational field. Which of these does NOT affect the gravitational field?

• The distance from the centre of mass.

• The mass of the object within the field.

Which of these statements is TRUE?

• You have no weight on a space station orbiting the Earth.

• No gravity acts in space on a trip from the Earth to Mars.

• Gravitational fields and magnetic fields are the same.

• Different masses have different weights on the Earth.

On the Moon there is no air and hence no air resistance so objects fall at..

• A constant speed.

• A constant acceleration.

• A constant distance from the source of gravity.

If I travel to the Moon what about me changes?

• My mass

• My height

• My weight

Which 2 of these could be a definition of weight. Tick 2 boxes.

• The pulling force between objects as a result of their mass.

• The distance of the mass to the point of gravitational telescopic spectroscopy.

• The mass in kilograms of an object multiplied by the strength of the gravitational field in N/kg.

• The total amount of matter (stuff) in and object.

A rock on Earth has a mass of 15kg.

On Earth g - 9.8m/s.

What is the weight of the rock on Earth and what is the correct unit?

• 147 kg

• 154 N

• 154 kg

• 147 N

If an object weighs 306N on Earth, what does it weigh on the moon?

On Earth g = 9.8N/kg

On the Moon G = 1.6N/kg

• 1N

• 15.68N

• 50N

• 2998.8N