1. The document contains a multiple choice quiz with questions about forces, equilibrium, friction, mass, weight, and other physics concepts. 2. It also includes short problems to solve involving forces, levers, inclined planes, and coefficients of friction. 3. Key concepts covered include Newton's laws of motion, equilibrium, friction, mass vs weight, and solving physics problems using concepts like forces, levers, and inclined planes.

1. TRIAL: FORCES IN EQUILIBRIUM
Engineering Physics 1
Multiple choices: 20 points (30%)
1. If the sum of all the forces acting on a moving object is zero, the object will:
a. Slow down and stop c. accelerate uniformly
b. Change the direction of its motion d. Continue moving with constant velocity
2. A force acting on the object is not able to…
a. change the direction of movement of the object c. cause acceleration of the object
b. change the mass of the material making up the object d. cause acceleration of the object
3. The graph below represents the:
a. Acceleration due to gravity
b. momentum of objects
c. Universal gravitational constant
d. d. weight of objects
4. A 500 kg block resting on a 30 deg inclined plane with μ=0.30. Find the required force P acting horizontally that will prevent the
block from sliding.
a. 1020 N b. 1160 N c. 1250 N d. 1330 N
5. Which of the following statements concerning weight is incorrect:
a. Weight is a force of attraction between two objects
b. Weight is usually measured in kilograms
c. Weight can vary considerably depending where an object is
d. The weight of the object depends on the mass of the object
6. Which statement concerning the measurement of mass and weight is correct?
a. mass is measured using a beam balance, weight is measured using a spring balance
b. mass is measured using a beam balance, weight is also measured using a beam balance
c. mass is measured using a spring balance, weight is also measured using a spring balance
d. mass is measured using a spring balance, weight is measured using a beam balance
7. Three forces 20 N, 30 N, and 40 N are in equilibrium. Find the angle between the 30 N and 40 N forces.
a. 30 deg b. 28.96 deg c. 40 deg d. 25.97 deg
8. A 10 gram ball of cotton wool on Earth, at sea-level weighs more than ...
a. a 10 gram sheet of cotton wool on Earth at sea-level
b. 10 grams of cotton wool on Jupiter (a larger planet than Earth)
c. 10 grams of cotton wool 500 km above the Earth's surface
d. 10 grams of lead on Earth at sea level
9. A 40 kg block is resting on an inclined plane making an angle of 20 deg from the horizontal. If the coefficient of friction
is 0.60, find the force parallel to the incline that must be applied to cause impending motion down the plane. Use
g=9.81 m/s2.
a. 77 b. 82 c. 72 d. 87
10. A block of wood is resting on a level surface. If the coefficient of friction between the block and the surface is 0.30, how much can
the plane be inclined without causing the block to slide down?
a. 16.7 deg b. 30.2 deg c. 21.2 deg d. 33.3 deg
Identification: 20 points (30%)
1. ______ is the resistance to motion between two surfaces moving over each other.
2. _____ is the effect opposition of an action. It is equal to an action but is in opposite direction.
3. _____ is the force on a body produced by the downward pull of gravity on it.
4. ______ is the point in or near a body at which the resultant force of gravitational attraction acts.
5. _____ is the shortest perpendicular distance a force’s line of action and axis of rotation.
6. _____ is defined as turning or twisting force.
7. _____ is the point or support on which a lever pivots.
8. _____ is the law that states a particle not subjected to external forces remains at rest or moves with constant speed in a straight
line.
9. _____ is a condition in which all acting influences are canceled by others, resulting in a stable, balanced, or unchanging system.
10. _____ is defined as the net force acting upon an object is a product of its mass multiplied by its acceleration.
Problem Solving: 20 points (40%)
1. Determine the tensile force T in the cable and
compressive force on the boom. (T=439 lbs, C=538 lbs)

2. A
2. Two blocks are connected by a solid strut attached to
each block with frictionless pins. If the coefficient of
30o friction under each block is 0.25 and B weighs 270 lbs.
B Find the minimum weight of A to prevent motion.
45o
(598.17 lbs)
600 lbs B
C
30o
A 60o
Bonus Problem: 10 points
1. Determine the force P required to start the wedge shown. The angle of friction for all surfaces in contact is 15 deg. (943.37 lbs)