Try your hand at some physics problems based on gravity set by St John’s Physics tutor Professor Tony Weidberg…
Q: Many proposals have been made for a human powered helicopter. Consider the case of such a machine with a rotor 10 metres in diameter. Could a human create enough power to overcome gravity? The density of air is 1.23 kg m-3.
Q: Make a reasoned approximate estimate of the height a “pole-vaulter” could succeed in obtaining.
Teachers we want to hear from you too if you want to get involved and set some questions of your own – email firstname.lastname@example.org.