Friction
Give one way to overcome gravity
Use of aerofoil wings, using of jet engines, rotors or propellers
Gravitational Force/ Gravity
What pulls objects toward each other?
What is the opposing force between wheels and the floor?
Rolling Friction
It is still the same even you are outside the universe?
Mass
Who developed the Law of Universal Gravitation?
Sir Isaac Newton
What creates more friction?
rough surfaces, greater mass, greater surface area,
Give at least two scientist who studied about gravity, or paved the way for it to be discovered?
Isaac Newton, Albert Einstein, Nicholas Copernicus, Johannes Kepler, Galileo Galilei
Who developed the "Law of Gravitation"?
Isaac Newton
Why does a crumpled piece of paper land back before a flat sheet of paper?
There is more air resistance on the flat paper.
It changes when gravitational force changes.
Weight
Why does a flat sheet of paper falls slowly than a crumpled piece of paper?
There is more air resistance on the flat paper.
Give at least 2 ways to decrease friction.
Use smooth surfaces, wheels, grease, oil, lubricant, reduce weight, streamlining
How are tides formed?
Through the attraction between water on earth and moon's gravity.
What will be the weight of a man who is 70 kg in outer space?
Zero