15.the resistance created by object moving in water or air is known as what ?
A. static friction
B. sliding friction
C.fluid friction
D.Rolling friction

16.on which surface will a toy car traveled the shortest distance
A.carpet
B.polish wood
C.ice
D.tiled floor

17.marian dropped a sheet of paper and a book from the same height which of the following best explains why the book fell faster than the sheet of paper?

A. there was no air resistance acting on the book
B. the weight of the book was greater than the air resistance
C. the gravitational force acting on the paper was greater than its air resistance
D. the the air resistance act in the same direction as the weight of the falling paper

18.nilo climbs up the top of a rope. what can he do to help him slide down the rope quickly?

A. reduce friction
B. increase friction
C.reducing gravity
D. increase gravity

19. how does gravity affects whole height a person jumps?

A.the weaker the gravity the slow the jump
B. the weaker the gravity the higher the jump
C. the stronger the gravity the higher the jump
D. gravity does not affect how height one can jump


20. doods threw a ball upward.which of the following statement is true?

A. there is no force acting on the bullet on the highest pause

B. the gravitational force of the earth causes the ball to change its mass

C. the gravitational force of the earth does not act on the ball as it moves upward

D.the gravitational force of earth causes the ball to change the directions of the food

21. which of the following best describes friction

A. it is a force that occurs between solid
B. it is a force that occurs between solids and liquids
C. it is a force that of yours only on rough surface
D. it is a force that occurs when surfaces touch each other

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