MEDIUM
Lower Secondary Stage 7
IMPORTANT
Earn 100
Astronauts on a space mission travel from the Earth to the Moon. Describe the different sizes and directions of gravitational forces they experience when they are when they have landed on the Moon.
Important Questions on Forces and their Effects
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Astronauts on a space mission travel from the Earth to the Moon. Is there is any point on the journey when their measured weight would be zero? Explain where and why.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Explain how you feel your own weight, and why astronauts in a space station do not feel their weight even though they are still pulled by the Earth’s gravity.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Explain why the astronauts and the space station they are in do not fall to Earth but stay in orbit.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Newton’s First Law of Motion predicts that, when there is no force acting on it, an object moves with a steady speed in a straight line. Explain why it is difficult to show this in an experiment. What might you try?
EASY
Lower Secondary Stage 7
IMPORTANT
Malia is playing on a swing.
Select the correct statements.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
The drawing shows a solar LED street light. It has a solar panel, a battery and an LED lamp.
For every of energy stored in the battery, of useful light energy is output from the lamp. Calculate how much wasted energy is output.
MEDIUM
Lower Secondary Stage 7
IMPORTANT
Fossil fuels include coal, oil and natural gas. Explain why these fuels are non-renewable.
EASY
Lower Secondary Stage 7
IMPORTANT
The eight planets in our Solar System are Earth, Jupiter, Mars, Mercury, Neptune, Saturn, Uranus and Venus. Name the planet that is closest to the Sun.
