4 Who was the first scientist to really study and experiment with gravity and motion?
a. Aristotle b. Charles Darwin c. Galileo Galileid. Sir Isaac Newton
5. What can we see in the sky that is directly the main cause for revolution of planets on its orbit?
a. Sun
b. Stars
c. Moon d. Satellites
6. Which of the following statement is true?
a. Friction is a force that only occurs between solids
b. Friction is a force that only occurs on rough surfaces
C. Friction is a force that occurs when surfaces touch each other.
d. Friction is a force that occurs on below surfaces
7. Air resistance and water resistance are both types of friction
a. True
b. Falsec. Neither true or false d. Both a and b​