Question 12 (1 point)
An airplane is flying at 80 kilometers per hour when a strong tail wind, traveling in the same direction at 5 kilometers per hour, hits the airplane. How can the net force acting on the airplane be calculated?
a
add the forces
b
divide the forces
c
subtract the forces
d
multiply the forces
Question 13 (1 point)
Victoria and Claire are playing a game of tug-of-war, but the flag tied to the center of the rope is NOT moving. What is happening to the rope in this game?
a
Victoria is applying more force in one direction.
b
Victoria and Claire are applying equal forces in opposite directions.
c
Claire is applying more force in one direction.
d
Victoria and Claire are applying equal forces in the same direction.
Question 14 (1 point)
Ethan is helping his father rearrange the furniture in their living room. They have two different tables that are the same size. When Ethan pushes on each table, he finds that it is harder to move table A than it is to move table B. Why does Ethan have to push with more force on table A than on table B?
a
Table A has more volume than table B.
b
Table A has more mass than table B.
c
Table A weighs less than table B.
d
Table A is less dense than table B
Question 15 (1 point)
Newton's first law of motion states that an object at rest will remain at rest or an object in motion will remain in a constant motion, unless acted on by an outside force. Another name for this law is the
a
law of momentum.
b
law of gravity.
c
law of acceleration.
d
law of inertia.
Question 12: c (subtract the forces)
Question 13: b (Victoria and Claire are applying equal forces in opposite directions)
Question 14: b (Table A has more mass than table B)
Question 15: d (law of inertia)