or weight using gravitational field strength.
To investigate how craters form
on planet surfaces.To understand gravity, mass and weight.
To understand gravity, mass and weight.
gravity
mass
weight
Mass is measured in kilograms (kg).
Mass is not affected by the gravitational field strength and so remains unchanged, whichever planet it is measured on. Mass can only be changed by removing or adding matter to the object.
Weight is measured in newtons (N).
Weight is affected by the gravitational field strength of a planetary body and so can be different for the same object, depending on which planet it is measured on.
We can measure the weight of an object using a newton metre or spring balance.
We can also calculate the weight using the equation:
weight (N) = mass (kg) × gravitational field strength (N/kg)
We can also rearrange this equation to find the mass or gravitational field strength.
Have a go at rearranging the equation now.
weight (N) = mass (kg) × gravitational field strength (N/kg)
W = 900 × 9.81
W = 8829N
How do you think the craters form?
Craters form when other objects in space, such as comets or asteroids, collide with the surface of the planets.
Photograph courtesy of Wikimedia.org via Wikimedia Commons
They orbit the Sun along an elliptical pathway, but can often become trapped in the gravitational pull of other planet’s moons, such as Mars’ moons: Phobos and Deimos.
Due to their shape, they often orbit in quite an erratic motion, tumbling and twisting as they follow a general pathway. When they collide with one another, pieces of asteroid are thrown off the orbital pathway and can start on a pathway of collision with planets such as Earth or Mars.
What type of data is the diameter of the asteroid?
quantitative data/continuous data
What type of data is the mass of the asteroid?
qualitative data/discrete data
To be able to calculate an average result and avoid any anomalous data.
Which variable should you keep the same each time (control variable)?
The height from which the ‘asteroid’ is dropped.
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