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8.6C (2019-Q 16)

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

• F There are no forces acting on the rock.

• G The only force acting on the rock is directed toward the sidewalk.

• H The forces acting on the rock are all balanced.

• J The sidealk exerts an unbalanced force ont the rock.

(8.6C 2019 – Q41)

A pitcher throwas a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10-newton force to the ball.

Which statement correctly describes the reaction force to the ball?

• A the reaction force is the force that causes the bat to move toward the bat.

• B The reaction force is the force appliked to the bat by the player h9oling the bat.

• C The reaction force is the force that pulls the ball toward the ground.

• D The reaction force is the force of the ball on the bat.

(8.6C 2018 – Q14)

The picture shows an aerialist walking on a tightrope an holding a balancing bar. An anction-reaction pair of forces exists between -

• F the aerialist's feet and the rope

• G the rope and the balancing bar

• H the two ends of the rope

• J the aerialist's arms and legs

(8.5C 2019 – Q13)

• Group 2

• Group 8

• Group 12

• Group 18

(8.5C 2018 – Q11)

How many valence electrons aarre in an atom of each element in Group 15 in the periodic table? (Record your answer using the correct place value.)

(8.5C 2018 – Q31)

• A

• B

• C

• D

(8.5C 2017-Q2)

• F

• G

• H

• J

(8.C -Q30)

Which pair of properties describes the elements in Group 18?

• F They are chemically stable and liquid at room temperature.

• G They have eight balence electrons and are flammable.

• H They are maganetic and boil at low temeperatures.

• J They are gaseous and room temperature and chemically stable.

(8.5D 2019-Q17)

• A

• B

• C

• D

(8.5D 2019-Q32)

• 1

• 2

• 4

• 5