Download Quarter Two Physics MCA

Quarter Two Physics MCA
Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
____
1. Which of Newton’s laws best explains why motorists should buckle-up?
a. The law of inertia
c. The third law
b. Law of acceleration
d. the lw of gravitation
____
2. A constant net force acts on a object. Describe the motion of the object.
a. constant acceleration
c. constant velocity
b. constant speed
d. increasing acceleration
____
3. The acceleration of an object is inversely proprtional to
a. the net force acting on it
c. its velocity
b. its position
d. its mass
____
4. If you blow-up a balloon, and then release it, the balloon will fly away. This is an illustration of
a. Law of acceleration
c. Second law
b. Law of inertia
d. Third Law
____
5. A golf club hits a golf ball with a force of 2400N. The golf ball hits the club face with a force
a. slightly less than 2400 N
c. Slightly more than 2400 N
b. exactly 2400 N
d. close to 0 N
____
6. A child’s toy is suspended from the ceiling by means of a string. The Earth pulls downward on
the toy with its weight force of 8.0 N. If this is the “action force,” what is the “reaction force”?
a. The string pulling upward on the toy with c. The string pulling downward on the
an 8.0 N force
ceiling with an 8.0 N force
b. The ceiling pulling upward on the string d. The toy pulling upward on the Earth with
with an 8.0 N force
an 8.0 N force
____
7. Two cars collide head-on. At every moment during the collision, the magnitude of the force the
first car exerts on the second is exactly equal to the magnitude of the force the second car exerts
on the first. This is an example of
a. Newton’s First law
c. Law of Gravitation
b. Newton’s Second law
d. Newton’s Third law
____
____
8. Action -reatcion forces are
a. equal in magnitude and point in the same
direction
b. equal in magnitude but point in opposite
directions
c. unequal in magnitude but point in the
same direction
d. unequal in magnitude but point in opposite
directions
9. Mass and weight
a. both measure the same thing
b. mass is the same, weight is less
c. both mass and weight are less
d. both mass and weight are the same
____ 10. An example of a force that acts at a distance is
a. tension
c. static friction
b. weight
d. kinetic friction
____ 11. A stone is thrown straight up. At the top of its path, the net force acting on it is
a. greater than its weight
c. instantaneously equal to zero
b. greater than zero, but less than its weight d. equal to its weight
____ 12. An object of mass m is hanging by a string from the ceiling of an elevator. The elevator is
moving up at a constant speed. What is the tension in the string?
a. less than a mg
c. greater than mg
b. exactly mg
d. cannot be determined without knowing
speed
____ 13. The force that keeps you from sliding on an icy sidewalk is
a. weight
c. static friction
b. kinetic friction
d. normal force
____ 14. A block of mass M slides down a frictionless plane at an angle  to the horizontal. The normal
reaction force exerted by the plane on the block is
a. Mg
c. Mg cos 
b. Mg sin
d. zero, due to the frictionless plane
____ 15. If you push twice as hard against a stationary brick wall, the amount of work you do
a. doubles
c. remains constant but non-zero
b. is cut in half
d. remains constant at zero
____ 16. If you walk 5.0 m horizontaly forward at a constant velocity carrying a 10 N object, the amount
of work you do is
a. more than 50 J
c. less than 50 J, but more than 0 J
b. equal to 50 J
d. zero
____ 17. A container of water is lifted vertically 3.0m then returned to its original position. If the total
weight is 30 N, how much work was done?
a. 45 J
c. 180 J
b. 90 J
d. no work was done
____ 18. The area under the curve, on a Force versus Position graph, represents
a. work
c. power
b. kinetic energy
d. potential energy
____ 19. The quantity mgy is
a. the kinetic energy of an object
b. the gravitational potential energy of an
object
____ 20. The quantity 1/2 kx2 is
a. the kinetic energy of the object
b. the elastic potential energy of the object
c. the work done on the object by the force
d. the power supplied to the object by the
force
c. the work done on the object by the force
d. the power supplied to the object by the
force
____ 21. The total mecahnical energy of a system
a. is equally divided between kinetic and
c. can never be negative
potential energy
b. is either all kinetic or all potential energy, d. is constant, only if conservative forces act
at any one instant
____ 22. An acorn falls from a tree. Cfompare its kinetic energy K,to its potential energy U.
a. K increases and U decreases
c. K increases and U increases
b. K decreases and U decreases
d. K decreases and U increases
____ 23. A ball falls from the top of a building, through the air (air friction is present), to the ground
below. How does the kinetic energy K just before striking the ground compare to the potential
energy U at the top of the building?
a. K is equal to U
c. K is less than U
b. K is greater than U
d. It is impossible to determine
____ 24. The quantity Fd/t is
a. the kinetic energy of the object
b. the potential energy of the object
c. the work done on the object by the force
d. the power supplied to the object by the
force
____ 25. To accelerate your car at a constant acceleration, the car’s engine must
a. maintain a constant power output
c. develop ever-increasing power
b. develop ever-decreasing power
d. maintain a constant turning speed
____ 26. When a cannon fires a cannonball, the cannon wil recoil backward because the
a. energy of the cannonball and cannon is
c. energy of the cannon is greater than the
consereved
energy of the cannonball
b. momentum of the cannon and cannonball d. momentum of the cannon is greater than
is conserved
the momentum of the cannonball
____ 27. A freight car moves along a frictionless lwvel railroad track at a constant speed. The car is open
on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the
car?
a. it increases
c. it decreases
b. it remains the same
d. can not be determined based on the
information
____ 28. The area under the curve on a Force versus Time graph, represents
a. impulse
c. work
b. momentum
d. kinetic energy
____ 29. A small car meshes with a alrge truck in a head-on collision. Which of the following statements
concerning the magnitude of the average collision force is correct?
a. the truck experiences the greater average c. the small car and the truck experience the
force
same average force
b. the small car experiences the greater
d. it is impossible to tell since the masses and
average force
velocities are not given
____ 30. Two objects collide and bounce off each other. Linear momentum
a. is definitely conserved
c. is conserved only if the collision is elastic
b. is definitely not conserved
d. is conserved only if the environment is
frictionless
____ 31. When is kinetic energy conserved
a. in elastic collisions
b. in elastic collisions
c. in any collision in which the objects do
not stick together
d. in all collisions
____ 32. In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with
the same velocity as the cue ball had originally. The type of collsion is
a. elastic b. inelastic c. completely inelastic d. impusle
____ 33. A rubber ball with a speed of 5.0m/s collides head-on elastically with an identical ball at rest.
What is the speed of the initially stopped ball after the collision?
a. 0.0 m/s
c. 2.5 m/s
b. 1.0 m/s
d. 5.0 m/
____ 34. A very heavy object with speed v collides head-on with a very light object at rest. The collision
is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the
light object after the collision?
a. nearly v
c. nearly 3v
b. nearly 2v
d. infinite
____ 35. A very light object moving with a speed v collides head-on with a very heavy object at rest, in a
frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object
after the collision is
a. slightly greater than v
c. slightly less than v
b. equal to v
d. much less than v
____ 36. In an inelastic collision, if the momentum is conserved, then which of the following statements is
true about kinetic energy?
a. kinetic energy is also conserved
c. kinetic energy is lost
b. kinetic energy is gained
d. kinetic energy is not involved
____ 37. A small object collides with a large object and sticks. Which object experiences the larger
magnitude of momentum change?
a. the large object
c. both objects experiencve the same change
b. the small object
d. can not be determined from the
information given
____ 38. In a game of pool, the white ball hits the #9 ball and is deflected at an angle of 35o angle to the
original line of motion. What is the angle of deflection below the original line of motion for the
#9 ball?
a. 35 degrees
b. 55 degrees
c. 75 degrees
d. 90 degrees
____ 39. A plane, flying horizontally, releases a bomb, which explodes before hitting the ground.
Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion
a. is zero
c. moves vertically
b. moves horizontally
d. moves along a parabolic path
____ 40. If the net work done on an object is negative, then the object’s kinetic energy
a. decreases
c. increases
b. remains the same
d. is zero
____ 41. Which one of the following is an example of a vector quantity?
a. distance
c. mass
b. velocity
d. area
____ 42. Ignoring air resistance, the horizontal component of a projectile’s acceleration
a. is zero
c. increases
b. remains a non-zero constant
d. decreases
____ 43. Ignoring air resistance, the horizontal component of a projectile’s velocity
a. is zero
c. increases
b. remains constant
d. decreases
____ 44. When a football in a field goal attempt reaches its maximum height, how does its speed compare
to its initial speed?
a. it is zero
c. it is equal to the inital speed
b. it is less than the original speed
d. it is greater than the initial speed
____ 45. A plane drops a bomb from a plane flying horizontally at a constant speed. Neglecting air
resistance, when the bomb hits the ground the horizontal location of the plane will
a. be behind the bomb
c. be in front of the bomb
b. be over the bomb
d. depends on the speed of the plane when
the bomb was released
____ 46. If the acceleration of an object is alwaysdirected perpindicular to its velocity,
a. the object is speeding up
c. the object is turning
b. the object is slowing down
d. the situation is not possible
____ 47. If the net work done on an object is negative, then the object’s kinetic energy
a. decreases
c. increases
b. remains the same
d. is zero
____ 48. Is it possible for a system to have negative potential energy?
a. Yes, as long as the total energy is positive c. No, because the kinetic energy of a system
must equal its potential energy
b. Yes since the choice of the zero of
d. No, because this would have no physical
potential energy is arbitrary
meaning
____ 49. Describe the energy of a car driving up a hill
a. entirely kinetic
b. entirely potential
c. both kinetic and potential
d. gravitational
____ 50. Action - reaction forces
a. sometimes act on the same object
b. always act on the same object
c. may be at right angles
d. always act on different objects