Tavity
15. What will happen if you strike a match against the side of a matchbox?
a explosion will occur
c. friction will produce flame
b. light will be put out
d matchstick will be thrown away
10. What force keeps our feet from sliding when we are running or walking?
a gravitational force
c. friction
b. centripetal force
d. inertia
17. A car will skid more on a wet road than on a dry road. This happens because there is
more
between the tires and the road.
a magnetism
b. heat
c. friction
d. gravity
18 A ball that is dropped on the floor bounces after it hits the floor. Which of the following could affect
how high the ball bounces?
1. Time of day when the ball is dropped
II. Height from which the ball is dropped
III. Hardiness of surface on which the ball
IV. Size of the ball used
a. I only
b. I, II and IV
c. I and II
d. II, III and IV
19. Which of the following best describes the inner core?
a solid, iron and nickel
b. liquefied iron and nickel
c. solid, water rocks and decayed materials
d. very hot rocks containing silicon, magnesium, iron and aluminum
20. Which of the following statements describe the mantle layer of the earth?​