RADHWA INTERNATIONAL SCHOOL
GRADE 11 PHYSICS: OPEN BOOK TEST 2
23/12/2021
1. When forces on an object are unbalanced, the object experiences ______.
(A)
(B)
(C)
(D)
(E)
rest
free fall
an acceleration
a constant velocity
no change in motion
2. The tendency of a moving object to resist a change in speed or direction is called
______.
(A) kinetic friction
(B) inertia
(C) mass
(D) static friction
(E) weight
3. According to Newton’s Third Law, when two objects exert force on each other, the
forces are equal in ______ and opposite in ______.
(A) direction . . magnitude
(B) magnitude . . direction
(C) static friction . . kinetic friction
(D) kinetic friction . . static friction
(E) horizontal components . . vertical components
4. A(n) ______ force is a force that acts on an object in a direction perpendicular to the
surface of contact.
(A) air resistance
(B) gravitational
(C) kinetic friction
(D) normal
(E) static friction
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5. Which of the following forces exists between objects even in the absence of direct
physical contact?
(A) frictional force
(B) contact force
(C) fundamental force
(D) field force
(E) none of the above
6. A car goes forward along a level road at constant velocity. The additional force needed to
bring the car into equilibrium is
(A) greater than the normal force times the coefficient of static friction.
(B) equal to the normal force times the coefficient of static friction.
(C) the normal force times the coefficient of kinetic friction.
(D) the gravitational force
(E) zero.
7. Which statement about the acceleration of an object is correct?
(A) The acceleration of an object is directly proportional to the net external force acting on
the object and inversely proportional to the mass of the object.
(B) The acceleration of an object is directly proportional to the net external force acting on
the object and directly proportional to the mass of the object.
(C) The acceleration of an object is inversely proportional to the net external force acting
on the object and inversely proportional to the mass of the object.
(D) The acceleration of an object is inversely proportional to the net external force acting
on the object and directly proportional to the mass of the object.
(E) None of the above
8. Which of the following cannot be the resultant of force A = 7 N and B = 9 N
(A) 7 N
(B) 8 N
(C) 9 N
(D) 16 N
(E) 21 N
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9. A 35 kg wooden chest initially at rest on the wooden floor of a theater stage requires a 138
N horizontal force to set it in motion. What is the coefficient of static friction between the
chest and the stage?
(A) 0.21
(B) 0.25
(C) 0.40
(D) 2.5
(E) 3.9
Question 10 is based on the following illustration of a 6.75 kg box on a ramp with a
30.0º incline.
10. The coefficient of static friction between the box and the ramp is 0.500. What is the
magnitude of the minimum force, F, that must be applied to the box perpendicularly to
the ramp to prevent the box from sliding?
(A) 16.6 N
(B) 28.6 N
(C) 90.4 N
(D) 124 N
(E) 168 N
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