Physics PH114 - Lab Final Questions Exam With
Complete Solutions
Q: Two objects of the same mass fall from different heights. If air friction is negligible then
they will land on the ground
a) at different speeds, times but the same acceleration
b) at the same time and speed but different accelerations
c) at the same time but different speeds and accelerations
d) at the same time, speed and acceleration - ANSWER A: at different speeds, times but the
same acceleration
Q: A projectile of mass m1 is launched horizontally from a height of 100 m and speed 10 m s-1.
Another projectile of mass m2 free falls from the same height. The experiment is taking place
on Mars, where the gravity is about 1/2 of that of Earth. Atmospheric resistance can be
neglected. The two projectiles will land on the ground:
a) at different times
b) at the same time
c) can be either or, depending on their masses - ANSWER A: at the same time
, Q: A projectile has a velocity of 3t (i) - t^2 (j) , where t is the time in seconds while (i) and (j)
are the unit vectors for x and y-axis. At t=2 s, its total acceleration magnitude will be
a) 7 m s-2
b) 8 m s-2
c) 5 m s-2
d) 6 m s-2 - ANSWER A: 5 m s-2
Q: An object is left to slide without friction from the top of an inclined plane of angle (z). The
object is accelerating with
a) g sin(z)
b) no acceleration
c) g cos(z)
d) g - ANSWER A: g sin(z)
Q: A mass of 1 Kg is at rest on a horizontal surface with friction coefficient μ. When a
horizontal force of 5 N is applied to the object then it barely moves. If g=9.8 m s-2 then μ is
about
a) 0.5
Complete Solutions
Q: Two objects of the same mass fall from different heights. If air friction is negligible then
they will land on the ground
a) at different speeds, times but the same acceleration
b) at the same time and speed but different accelerations
c) at the same time but different speeds and accelerations
d) at the same time, speed and acceleration - ANSWER A: at different speeds, times but the
same acceleration
Q: A projectile of mass m1 is launched horizontally from a height of 100 m and speed 10 m s-1.
Another projectile of mass m2 free falls from the same height. The experiment is taking place
on Mars, where the gravity is about 1/2 of that of Earth. Atmospheric resistance can be
neglected. The two projectiles will land on the ground:
a) at different times
b) at the same time
c) can be either or, depending on their masses - ANSWER A: at the same time
, Q: A projectile has a velocity of 3t (i) - t^2 (j) , where t is the time in seconds while (i) and (j)
are the unit vectors for x and y-axis. At t=2 s, its total acceleration magnitude will be
a) 7 m s-2
b) 8 m s-2
c) 5 m s-2
d) 6 m s-2 - ANSWER A: 5 m s-2
Q: An object is left to slide without friction from the top of an inclined plane of angle (z). The
object is accelerating with
a) g sin(z)
b) no acceleration
c) g cos(z)
d) g - ANSWER A: g sin(z)
Q: A mass of 1 Kg is at rest on a horizontal surface with friction coefficient μ. When a
horizontal force of 5 N is applied to the object then it barely moves. If g=9.8 m s-2 then μ is
about
a) 0.5
