Download Standard Physics Mid

Standard Physics Mid-Term Review
Multiple Choice Questions
Please choose the best letter that answers each statement.
1. A vector quantity has (a) magnitude only (b) direction only (c) both magnitude
and direction (d) neither magnitude or direction
2. Of the following, the one that is a vector quantity is (a) speed (b) time (c) mass
(d) velocity
3. The graph that best represents the relationship between acceleration and time for a
freely falling body is (a) linear, positive slope (b) Linear, negative slope
(c) horizontal line (d) parabolic curve
4. A train is traveling northward with a velocity of 100 km/hr. A child on this train
walks southward with a velocity of 5 km/hr. The child’s velocity with respect to
he ground is (a) 95 km/hr N (b) 95 km/hr S (c) 105 km/hr N (d) 105 km/hr S
5. A ball is thrown horizontally from the top of a cliff. Before the ball hits the
ground, it (neglecting air resistance), (a) accelerates vertically only (b)
accelerates horizontally only (c) accelerates both horizontally and vertically
6. A car traveling at 50 km/hr changes its speed to 110 km/hr is 5 seconds. The
acceleration of the car during this time is (a) 5 km/hr/sec (b) 12 km/hr/sec
(c) 50 km/hr/sec (d) 60 km/hr/sec
7. An airplane traveling 150 m/s drops a package of food at an altitude of 490 m.
Neglecting air resistance, the horizontal distance the package travels before
striking the ground is (a) 490 m (b) 980 m (c) 1500 m (d) 15,000 m
8. The graph that represents the relationship between distance and time for a body
falling freely from rest is (a) linear, positive slope (b) Linear, negative slope
(c) horizontal line (d) parabolic curve
9. If there is to be a change in velocity, there must be a change in (a) speed only
(b) direction only (c) either speed or direction (b) both speed and direction
10. The attractive force of the earth on a body determines the body’s (a) energy
(b) mass (c) weight (d) volume
11. If the distance between the earth and moon were halved, the force of attraction
between them would be (a) one fourth as great (b) one half as great (c) twice as
great (d) four times as great
12. A 2000 kg car traveling at a speed of 30 m/s hits a brick wall and stops in 0.1
seconds. The average force exerted by the brick wall on the car is
(a) 2000 N (b) 6000 N (c) 60,000 N (d) 600,000 N
13. If G = 6.6 x 10-11 Nm2/kg2 , the force of gravitation between a 60 kg boy and a 50
kg girl sitting 1 meter apart is (a) 7.92 x 10-11 N (b) 1.98 x 10-7 N
(c) 1.98 x 107 N (d) 4.5 x 1013 N
14. If the mass of a satellite in orbit around the earth is doubled, the speed of the
satellite (a) is halved (b) remains the same (c) is doubled (d) is tripled
Use this data for numbers 15-17:
A 1000 kg car traveling with a speed of 10 m/s runs into a 500 kg car which is at rest.
The cars now are stuck and move together in the same direction as the 1000 kg car.
15. The speed of the cars together is (a) 2 2/3 m/s(b) 5 m/s (c) 6 2/3 m/s (d) 10 m/s
16. Before the collision, the kinetic energy of the 1000 kg car was (a) 10,000 J
(b) 25,000 J (c) 50,000 J (d) 100,000 J
17. Before the collision, the momentum of the 1000 kg car was (a) 100 kgm/s
(b) 1000 kgm/s (c) 10,000 kgm/s (d) 100,000 kgm/s
This graph shows a car traveling along a level road over time.
18. From 0 to 1 seconds, the acceleration of the car is (a) 20 m/s2 (b) 40 m/s2 (c) 60
m/s2
19. The distance traveled between 0 and 2 seconds is (a) 50 m (b) 60 m (c) 70 m
(d) 80m
20. From 2 to 4 seconds, the acceleration of the car is (a) 20 m/s2 (b) 40 m/s2
(c) 60 m/s2 (d) 100 m/s2
21. From 4 to 8 seconds, the acceleration of the car is (a) -20 m/s2 (b) -40 m/s2
(c) -60 m/s2 (d) -100 m/s2
22. A 5 kg mass is pushed by a net force of 100 N. The mass accelerates at
(a) 0.05 m/s2 (b) 5 m/s2 (c) 20 m/s2 (d) 500 m/s2
23. An example of a scalar quantity is (a) displacement (b) momentum (c) weight
(d) mass
24. A car, starting at rest, is uniformly accelerated and attains a speed of 20 m/s in 5
sec. The acceleration of the car during the 5 sec is (a) 4 m/s2 (b) 5 m/s2 (c) 20
m/s2 (d) 100 m/s2
25. The Newton is a unit of (a) energy (b) force (c) mass (d) momentum
26. A vector of 4 m/s N is added to a vector of 3 m/s W. The resultant vector sum is
(a) 7 m/s (b) 1 m/s (c) 5 m/s (d) 25 m/s
27. A man who can row at 2 m/s in still water heads directly across a stream. If the
current flows at 2 m/s, he will be carried off his intended course by
(a) 45 degrees (b) 30 degrees (c) 90 degrees (d) zero degrees
28. A bullet is fired horizontally from a cliff while at the same instant a stone is
dropped from the same height. Ignoring friction,
(a) both will strike the ground at the same time
(b) the stone will hit first
(c) the bullet will hit first
(d) not enough data given
29. A student weighing 200 N stands on a scale inside an elevator. The elevator
descends 20 floors and comes to a stop. He notes on the scale the following
sequence of readings, starting with the elevator at rest:
(a) 200, less than 200, 200, more than 200, 200
(b) 200, more than 200, 200, less than 200, 200
(c) 200, less than 200, more than 200, 200
(d) 200, more than 200, less than 200, 200
30. Inertia is measured in (a) pounds (b) dynes (c) newtons (d) kilograms
31. If the acceleration of gravity is 32 ft/s2, a ball is thrown upward with a velocity of
128 ft/sec will return to the ground after a total time of (a) 4 sec (b) 8 sec
(c) 16 sec (d) none of these
32. If a feather and a nickel are dropped together in a vacuum
(a) a greater force acts on a feather (b) the same force acts on both objects (c) the
coin will fall faster (d) both objects have the same acceleration
33. A resultant force is always (a) the arithmetical sum of the components
(b) greater than any one component (c) equal and opposite to the vector sum (d) a
single force that will produce the same effect as the components.
34. A boy pulls on a rope with a force of 50 N at an angle of 30 degrees with the
horizontal. The horizontal component is (a) 25 N (b) 50 N (c) 50 sin 300 (d)
50cos300
35. A car on a 30 degree incline weighs 5000 N. The force needed to hold it
stationary is
a) 5000 N (b) 4330 N (c) 2500 N (d) none of these
36.
(a)
(b)
(c)
(d)
One freight car is at rest and is hit by a second car. If the two lock together,
the sum of their momenta after the collision is greater than before
the sum of their momenta before the collision is greater than after
the momentum after the collision is equal to the momentum before the collision
momentum is lost in this inelastic collision
37. The strength of gravity on the moon is only 1/6th that on earth. If an astronaut
has a mass of 90 kg on earth, what would his mass be on the moon?
(a) 540 kg (b) 90 kg (c) 15 kg (d) 6 kg
38. A ball with a weight of 20 N is thrown vertically upward. What is the
acceleration of the ball just as it reaches the top of its path?
(a) zero (b) 10 m/s/s downward (c) 10 m/s/s upward (d) not enough information
39. A ball falling from a great height will reach terminal speed when its _____goes
to zero. (a) inertia (b) net force (c) weight (d) speed
40. When a snowflake falls, it quickly reaches terminal velocity. This happens
because (a) the mass of the snowflake is too small for gravity to have any effect
(b) there is no net force on it (c) the snowflake has no weight (d) the mass of the
snowflake is smaller than its weight
41. A 40 kg crate is being pushed across a horizontal floor. If the coefficient of
sliding friction is 0.3, what is the frictional force acting on the crate?
(a) 12 N (b) 40 N (c) 120 N (d) 400 N
42. A crate has a mass of 24 kg. What applied force is required to produce an
acceleration of 3 m/s2 if the frictional force is known to be 90 N?
(a) 72 N (b) 90 N (c) 162 N (d) 240 N
43. A 40 kg crate is being pushed across a horizontal floor by a horizontal force of
240 N. If the coefficient of sliding friction is 0.5, what is the acceleration of the
crate?
(a) zero (b) 1 m/s2 (c) 3 m/s2 (d) 6 m/s2
44. Terry and Chris pull hand-over-hand on opposite ends of a rope while standing
on a frictionless frozen pond. Terry’s mass is 75 kg and Chris’ mass is 50 kg. If
Terry’s acceleration is 2 m/s2, what is Chris’ acceleration? (a) 2 m/s2 (b) 3 m/s2
(c) 6 m/s2 (d) 10 m/s2
45. If you stand of a spring scale in your bathroom at home, it reads 600 N, which
means your mass is 60 kg. If instead you stand on the scale while acceleration at
2 m/s2 upward in an elevator, how many newtons would it read? (a) 120 N
(b) 480 N (c) 600 N (d) 720 N
46. A cyclist turns a corner with a radius of 50 m at a speed of 20 m/s. What is the
magnitude of the cyclist’s acceleration? (a) 0.4 m/s2 (b) 8 m/s2 (c) 10 m/s2
(d) 1000 m/s2
47. A baseball is hit with a vertical speed of 10 m/s and a horizontal speed of 30 m/s.
How long will the ball remain in the air? (a) 1 s (b) 2 s (c) 3 s (d) 6 s
48. Now a tennis ball is hit with a vertical speed of 10 m/s and a horizontal speed of
30 m/s. How far will the ball travel horizontally before landing? (a) 30 m (b) 40
m (c) 60 m (d) 80 m
49. A rock is thrown off a tall cliff with a vertical speed of 25 m/s upward and a
horizontal speed of 30 m/s. What will these speeds be 3 seconds later?
(a) 25 m/s upward and 30 m/s horizontal
(b) 5 m/s downward and 30 m/s horizontal
(c) 25 m/s upward and 0 m/s horizontal
(d) 30 m/s downward and 60 m/s horizontal
50. Mercury has a radius of about 0.38 Earth radii and a mass of only 0.055 Earth
masses. Estimate the acceleration due to gravity on Mercury.
(a) 1.45 m/s2 (b) 3.81 m/s2 (c) 26.3 m/s2 (d) 69.1 m/s2
Answers
to Physics
Midterm
multiple
Answers
to Physics
Midterm
multiple
choice
review packet
1.
2.
3.
4.
5.
c
d
c
a
a
6. b
7. c
8. d
9. c
10. c
11. d
12. d
13. b
14. b
15. c
16. c
17. c
18. b
19. c
20. a
21. a
22. c
23. d
24. a
25. b
26. c
27. a
28. a
29. c
30. d
31. b
32. d
33. d
34. d
35. c
36. c
37. b
38. b
39. b
40. b
41. c
42. c
43. b
44. b
45. d
46. b
47. b
48. c
49. b
50. b