CHAPTER 5

Take a Diagnostic Test

IN THIS CHAPTER
Summary: Assess your strengths and weaknesses by answering some sample questions and then reading the answers and explanations, so
you’ll know where to focus your efforts when preparing for the exam.

Diagnostic Test

Kinematics

1   . Which of  the following   must    be  true    of  an  object  that    is  slowing down?

(A) Its acceleration    must    be  negative.

(B) Its velocity    must    be  smaller than    its acceleration.

(C) It  must    experience  more    than    one force.

(D) Its acceleration    and its velocity    must    be  in  opposite    directions.

(E) Its velocity    must    be  negative.

2   . A baseball    is  thrown  straight    up. It  reaches a   peak    height  of  15  m,  measured    from    the ground, in  a   time

of  1.7 s.  Treating    “up”    as  the positive    direction,  what    is  the acceleration    of  the ball    when    it  reaches its

peak    height?

(A) 0   m/s^2

(B) +8.8    m/s^2

(C) −8.8    m/s^2

(D) +9.8    m/s^2

(E) −9.8    m/s^2

Newton’s laws

3   . What  is  the vertical    component   of  F   1    in the above   diagram?