A ball is dropped from the top of a tall building. As the ball falls, the upward force of air resistance becomes equal to the downward pull of gravity.
When these two forces become equal in magnitude, the ball will:
Answer
A flatten due to the forces.
B fall at a constant speed.
C continue to speed up.
D slow to a stop.
Question 5
Question
Four forces are acting on a box, as shown below.
This box will increase in speed
Which of the following sets contains only objects that shine as a result of reflected light?
Answer
A moons, planets, and comets
B moons, comets, and stars
C planets, stars, and comets
D planets, stars, and moons
Question 7
Question
John wants to build a racetrack that will allow his toy cars to travel fast when force is applied.
Which material should he use?
Answer
A carpet, because friction will be high
B gravel, because friction will be high
C plastic, because friction will be low
D sandpaper, because friction will be low
Question 8
Question
A magnet is placed near a pile of steel paper clips. Which will most likely occur?
Answer
A The magnet will provide a balanced force, causing the paper clips to spin in circles.
B The magnet will provide an unbalanced force, keeping the paper clips stationary.
C The magnet will provide a balanced force, pushing the paper clips away from it.
D The magnet will provide an unbalanced force, pulling the paper clips toward
Question 9
Question
Letters A, B, C, and D in the diagram below represent four positions of the Moon in its orbit around Earth.
At which Moon position would a person on Earth see the entire lighted half of the Moon (full-Moon phase)?