Chapter 3 : Forces and energy Flashcards
Gravity, weight and mass. Formation of the Solar System. Movement in space. Tides. Energy. Changes in energy. Where does energy go.
What is the time difference between high tide and low tide?
6 hours
How long does it take for high tide to return to high tide?
12 hours
What is mass?
Mass is the amount of matter in an object
What is weight?
Weight is the amount of gravitational force on an object.
What is weight measured in?
Newtons (N)
What is mass measured in?
Kilograms (kg)
What is the formula to find weight of different objects on Earth?
w = m x 10
What is the formula to find the weight of different objects
w = m x g
What is the order of the planets from the sun?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
All the planets follow a path of _________ around the sun
orbit
What is a vacuum?
A space where there are no particles
What is air resistance?
Air resistance is a force caused by moving objects having to push against the particles in the air.
What is tidal range?
The difference in the depth of water between high tide and low tide.
What is Earth tide?
Changes to the land in height due to the effect of tides.
What is tidal force?
Tidal force is the pull from the moon’s gravity.
What causes tides?
When the moon orbits the Earth, its gravity pulls the water towards it, causing the tide to rise.
Does the sun produce a tidal force on Earth?
Yes.
What are the effects of tides?
- Some harbours can only be used at a certain time of day.
- Costal areas are more likely to have flooding at times of high tide.
- Volcano eruptions have been linked with Earth tide
- Earthquakes have been linked with Earth tide
What is energy?
Energy is something that needs to be changed or transferred in order to perform a function.
What are all the different kinds of energy?
Electrical, kinetic, elastic potential, light, sound, thermal, chemical gravitational potential
What is kinetic energy? Is it stored or transferred?
Kinetic energy is energy stored due to a movement of an object. Stored.
What is chemical energy? Is it stored or transferred?
Chemical energy is energy stored in food, batteries and chemical fuels. Stored.
What is thermal energy? Is it stored or transferred?
Thermal energy is energy stored in hot objects and transferred to colder objects. Can be stored or transferred.
Is elastic potential energy stored or transferred?
Stored.
Is gravitational potential energy stored or transferred?
Stored
Is electrical energy stored or transferred?
Transferred
Is light energy stored or transferred?
Transferred
Is sound energy stored or transferred?
Transferred
Can wasted energy be recovered? Why?
No. Wasted energy is dissipated and unable to be recovered.
What does ‘dissipated’ mean?
To spread out and become less useful.
