PHYSICS 151: TEST 2 QUESTIONS AND
ANSWERS 100% VERIFIED
An object is moving with constant non-zero velocity. Which of the following statements
about it must be true? - ANSWER The net force on the object is zero.
A push of magnitude P acts on a box of weight W as shown in the figure. The push is
directed at an angle θ below the horizontal, and the box remains a rest. The box rests on
a horizontal surface that has some friction with the box. The friction force on the box due
to the floor is equal to - ANSWER W = P cos θ
A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the
horizontal. What must be true about force of static friction f on the block? - ANSWER f =
mg sin θ
A person stands on a scale in an elevator. His apparent weight will be the greatest when
the elevator - ANSWER is accelerating upward.
Three boxes are pulled along a horizontal frictionless floor by a constant horizontal pull
P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as
shown in the figure. Which of the following statements about the tensions is correct?
(There could be more than one correct choice.) - ANSWER T1 > T2
When a car goes around a banked circular curve at the proper speed speed for the
banking angle, what force cause it to follow the circular path? - ANSWER the normal
force from the road
Two planets have the same surface gravity, but planet B has twice the mass of planet A.
If planet A has radius r, what is the radius of planet B? - ANSWER r√2
You throw a baseball straight up. Compare the sign of the work done by gravity while the
ball goes up with the sign of the work done by gravity while it goes down. - ANSWER The
, work is negative on the way up and positive on the way down.
A stone is held at a height h above the ground. A second stone with four times the mass
of the first one is held at the same height. The gravitational potential energy of the
second stone compared to that of the first stone is - ANSWER four times as much.
A person stands on a scale in an elevator. His apparent weight will be less when the
elevator... - ANSWER Is accelerating downward
Two planets have the same surface gravity, but planet A has twice the mass of planet B.
If planet A has radius r, what is the radius of planet B? - ANSWER r/√2
A stone held at a height h above the ground. A second stone with four times the mass of
the first one is held at the same height. The gravitational potential energy of the first
stone compared to that of the second stone is... - ANSWER one-fourth as much
Newton's Second Law - ANSWER ∑F = ma
Newton's Third Law - ANSWER F(gp) = -F(pg)
Whenever one object exerts a force on a second object, the second exerts an equal
force in the opposite direction on the first.
How is friction force written? - ANSWER F(fr) = µ(k)F(n) : (kinetic friction)
or
F(fr) ≤ µ(s)F(n) : (static friction)
What are the SI units for Mass and Force - ANSWER Mass: kilogram (Kg)
ANSWERS 100% VERIFIED
An object is moving with constant non-zero velocity. Which of the following statements
about it must be true? - ANSWER The net force on the object is zero.
A push of magnitude P acts on a box of weight W as shown in the figure. The push is
directed at an angle θ below the horizontal, and the box remains a rest. The box rests on
a horizontal surface that has some friction with the box. The friction force on the box due
to the floor is equal to - ANSWER W = P cos θ
A block of mass m sits at rest on a rough inclined ramp that makes an angle θ with the
horizontal. What must be true about force of static friction f on the block? - ANSWER f =
mg sin θ
A person stands on a scale in an elevator. His apparent weight will be the greatest when
the elevator - ANSWER is accelerating upward.
Three boxes are pulled along a horizontal frictionless floor by a constant horizontal pull
P. The boxes are connected by very light horizontal strings having tensions T1 and T2 as
shown in the figure. Which of the following statements about the tensions is correct?
(There could be more than one correct choice.) - ANSWER T1 > T2
When a car goes around a banked circular curve at the proper speed speed for the
banking angle, what force cause it to follow the circular path? - ANSWER the normal
force from the road
Two planets have the same surface gravity, but planet B has twice the mass of planet A.
If planet A has radius r, what is the radius of planet B? - ANSWER r√2
You throw a baseball straight up. Compare the sign of the work done by gravity while the
ball goes up with the sign of the work done by gravity while it goes down. - ANSWER The
, work is negative on the way up and positive on the way down.
A stone is held at a height h above the ground. A second stone with four times the mass
of the first one is held at the same height. The gravitational potential energy of the
second stone compared to that of the first stone is - ANSWER four times as much.
A person stands on a scale in an elevator. His apparent weight will be less when the
elevator... - ANSWER Is accelerating downward
Two planets have the same surface gravity, but planet A has twice the mass of planet B.
If planet A has radius r, what is the radius of planet B? - ANSWER r/√2
A stone held at a height h above the ground. A second stone with four times the mass of
the first one is held at the same height. The gravitational potential energy of the first
stone compared to that of the second stone is... - ANSWER one-fourth as much
Newton's Second Law - ANSWER ∑F = ma
Newton's Third Law - ANSWER F(gp) = -F(pg)
Whenever one object exerts a force on a second object, the second exerts an equal
force in the opposite direction on the first.
How is friction force written? - ANSWER F(fr) = µ(k)F(n) : (kinetic friction)
or
F(fr) ≤ µ(s)F(n) : (static friction)
What are the SI units for Mass and Force - ANSWER Mass: kilogram (Kg)
