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Short Quiz in Science 8 Infer that circular motion requires the application of constant force

Quiz by Quizalize Premium (Philippines)

Grade 8
Science
Philippines Curriculum: Grades 1-10

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5 questions
Show answers
  • Q1
    Rex Things and Doris Locked are out on a date. Rex makes a rapid right-hand turn. Doris begins sliding across the vinyl seat (that Rex had waxed and polished beforehand) and collides with Rex. To break the awkwardness of the situation, Rex and Doris begin discussing the physics of the motion that was just experienced. Rex suggests that objects which move in a circle experience an outward force. Thus, as the turn was made, Doris experienced an outward force that pushed her towards Rex. Doris disagrees, arguing that objects that move in a circle experience an inward force. In this case, according to Doris, Rex traveled in a circle due to the force of his door pushing him inward. Doris did not travel in a circle since there was no force pushing her inward; she merely continued in a straight line until she collided with Rex. Who is correct? Argue one of these two positions.
    Rex
    None
    Both
    Doris
    30s
    S8FE-Ib-19
  • Q2
    Kara Lott is practicing winter driving in the GBS parking lot. Kara turns the wheel to make a left-hand turn but her car continues in a straight line across the ice. Teacher A and Teacher B had viewed the phenomenon. Teacher A argues that the lack of a frictional force between the tires and the ice results in a balance of forces that keeps the car traveling in a straight line. Teacher B argues that the ice placed an outward force on the tire to balance the turning force and thus keep the car traveling in a straight line. Which teacher is (A or B) is the physics teacher?
    Teacher B
    Both
    Teacher A
    None
    30s
    S8FE-Ib-19
  • Q3
    A car moves around a circular path of a constant radius at a constant speed. Which of the following statements is true?
    The car’s acceleration is directed toward the center
    The car’s acceleration is zero
    The car’s velocity is directed toward the center
    The car’s acceleration is constant
    30s
    S8FE-Ib-19
  • Q4
    An object moves in a circular path at a constant speed. Which of the following is true?
    The car’s acceleration is zero because it has a constant speed
    The car’s acceleration is not zero and causes the car to slow down
    The car’s acceleration is not zero and causes the car to speed up
    The car’s acceleration is not zero and causes the change in the direction of the car’s velocity
    30s
    S8FE-Ib-19
  • Q5
    A boy stands at the edge of a rotating table. Which of the following forces prevents him from sliding off the table?
    The static friction
    The force of gravity
    The kinetic friction
    None from the above
    30s
    S8FE-Ib-19

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