answer the questions (Mechanics) multiple choice
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Topic: Newton’s 2nd Law 47) A 10-kilogram block with an initial velocity of 10 m/s slides 10 meters across a horizontal surface and comes to rest. It takes
the block 2 seconds to stop. The stopping force acting on the block is about: (hint use linear motion formula to find deceleration)
Suppose you’re on a Ferris wheel at a carnival, seated 5 m from the Ferris wheel’s axis. If you make a complete rotation each minute, your linear speed
is? (think distance traveled per time period and find the distance from considering a circle)
Not enough information is given.
Topic: Newton’s 2nd Law 22) A tow truck exerts a force of 3000 N on a car, accelerating it at 2 meters per second per second. What is the mass of the car?
(C03TBq 17) A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s?
Topic: Newton’s 2nd Law 7) The force of friction on a sliding object is 10 newtons. The applied force needed to maintain a constant velocity is
none listed correct
more than 10 N.
less than 10 N.
(C07TBq 34) Using 1000 J of work, a toy elevator is raised from the ground floor to the second floor in 20 seconds. The power needed to do this job was
Topic: Newton’s 2nd Law 46) A car traveling at 22 m/s comes to an abrupt halt in 0.1 second when it hits a tree. What is the deceleration in meters per
second per second of the car?
(C03TBq 12) If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is
A river 100 m wide flows due south at 1 m/s. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat
reaches the east bank: (Hint: use Vectors)
100 m farther north than where it started.
due east of where it started.
141 m farther south than where it started.
100 m farther south than where it started.
Topic: Newton’s 2nd Law 34) A 10-N block and a 1-N block lie on a horizontal frictionless table. To provide them with equal horizontal acceleration, we
would have to push with
10 times as much force on the heavier block.
1/10 as much force on the heavier block.
equal forces on each block.
10 squared or 100 times as much force on the heavier block.
A bullet is fired horizontally with an initial velocity of 300 m/s from a tower 20 m high. If air resistance is negligible, the horizontal distance the bullet
travels before hitting the ground is about (hint: determine the time using height and 10m/s2 for g). (Hint; see slides for projectiles)
A ball player wishes to determine pitching speed by throwing a ball horizontally from an elevation of 5 m above the ground. The player sees the ball land
20 m down range. What is the player’s pitching speed? (Hint: see slides for projectiles)
about 10 m/s
none of these
about 5 m/s
about 20 m/s
about 25 m/s
A river 100 m wide flows due south at 1 m/s. A boat that goes for 50 seconds from west bank to land at a point due straight east of its starting point, the
boat must be going? (Hint: use Vectors)
1 m/s north.
1.41 m/s northeast.
141 m/s east.
nowhere it can’t be done.
2.24 m/s northeast
(C07TBq 29 mo A TV set is pushed a distance of 1 m with a force of 20 N. How much work is done on the set?
An airplane travels at 141 km/h exactly toward the northeast. What is its component of velocity due north? (use coordinate system
and Pythagoras or cosine of the angles)
(C03TBq 9) If a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s/s, then its
speed reading would increase each second by
depends on its initial speed
Topic: Newton’s 2nd Law 41) A 1-kg rock that weighs 9.8 N is thrown straight upward at 20 m/s. Neglecting air resistance, the net force that acts on it
when it is half way to the top of its path is
None of these
less than 9.8 N.
more than 9.8 N.
(C03TBq2) A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is
(C07TBq 30 mo It takes 40 J to push a large box 10 m across a floor. Assuming the push is in the same direction as the move, what is the magnitude of the
force on the box?
none of these
(C03TBq 25) At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately
(C07TBq 16 mo A bow is drawn so that it has 100 J of potential energy. When fired, the arrow will ideally have a kinetic energy that is
impossible to predict without additional information
less than 40 J.
more than 40 J.
(C03TBq 10) Twelve seconds after starting from rest, an object falling freely will have a speed of
more than 100 m/s.
(C03TBq 8) If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about
a variable amount.
depends on its initial speed
(C07TBq 7) The power required to exert 2 N force, over a distance of 2 m in 2 second is
none of these
Topic: Newton’s 2nd Law 53) What horizontally-applied force will accelerate a 400-kg crate at 1 m/s/s across a factory floor against a friction force half its
weight? ( find weight mass correlation and use it with gravity acceleration)
(C07TBq 8 mod) Do 100 J of work in 20 s and your power output is
Topic: Newton’s 2nd Law 49) If you are driving at 20 m/s and slam on your brakes and skid at 0.5 g to a full stop, the skidding time in seconds is (hint:
deceleration here is in tines gravity acceleration )
Topic: Newton’s 2nd Law 21) A car has a mass of 1000 kg and accelerates at 2 meters per second per second. What is the magnitude of the net force
exerted on the car?
(C03TBq 15 mod) It takes 10 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft?
about 180 m
about 120 m
more than 200 m
about 60 m
(C03TBq 42) Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car’s acceleration in meters per second per second?
(C07TBq 11 mo A 500-kg car and a 2000-kg car are hoisted the same distance. Raising the more massive car requires
as much work.
twice as much work.
more than four times as much work.
four times as much work.
Topic: Newton’s 2nd Law 42) A 1-kg ball is thrown at 10 m/s straight upward. Neglecting air resistance, the net force that acts on the stone when it is
halfway to the top of its path is about
An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed of? (Hint: use Vectors)
A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. The boat crosses
in? (Hint: use Vectors and linear motion formulas)
(C07TBq 37) A car moves 4 times as fast as another identical car. Compared to the slower car, the faster car has
8 times the KE.
16 times the KE.
12 times the KE.
4 times the KE.
Topic: Newton’s 2nd Law 50) A 1000-kg automobile enters a freeway on-ramp at 20 m/s and accelerates uniformly up to 40 m/s in a time of 10 seconds.
How far does the automobile travel during that time? (use linear motion equitations, the mass is not needed here!)
Throw an object upward at a 45 degree angle. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 second, it
is? (Hint: draw it in a coordinate system, use Vectors and consider just the vertical component where you apply gravity as in free fall)
about 10 m below the straight line.
about 5 m below the straight line.
about 25 m below the straight line
about 15 m below the straight line.
about 35 m below the straight line
(C07TBq 40) A machine puts out 100 Watts of power for every 1000 Watts put into it. The efficiency of the machine is
none of these
Topic: Newton’s 2nd Law 6) An object is pulled northward by a force of 10 N and at the same time another force of 15 N pulls it southward. The
magnitude of the resultant force on the object is
Topic: Newton’s 2nd Law 51) A 2000-kg car experiences a braking force of 10,000 N and skids to a stop in 6 seconds. The speed of the car just before the
brakes were applied was? ( start with Newton 2 then use definition for acceleration)
(C03TBq 40) A car accelerates at 2 meters per second per second. Assuming the car starts from rest, how much time does it need to accelerate to a speed of
none of these
(C03TBq 21) If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about
A river 100 m wide flows due south. A boat that goes 1 m/s relative to the water is pointed due east as it crosses from the west bank. Relative to the Earth,
the boat travels? (Hint: use Vectors)
(C07TBq 45) Consider a hydraulic press. When the input piston is depressed 20 cm, the output piston is raised 1 cm. On the same press, an input force of 1
N can lift a load of
All of the above are correct.
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