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A series of physics problems related to falling objects, forces, and related concepts such as mass, acceleration, work, and energy. The problems involve calculating various quantities such as distance traveled, mass, acceleration, and force, given different initial conditions.
Typology: Exercises
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If you’re in a car that gets hit from behind, you can getwhiplash (neck injury) if your head is not against aheadrest. This is best explained via:A) your whole body undergoes a sudden acceleration.B) there is an action-reaction pair of forces betweenyour neck and head.C) inertia -- the back of your seat pushes your backforward but your head tends to stay where it was.D) inertia – you resist the motion of the car.E) none of these
If you’re in a car that gets hit from behind, you can getwhiplash (neck injury) if your head is not against aheadrest. This is best explained via:A) your whole body undergoes a sudden acceleration.B) there is an action-reaction pair of forces betweenyour neck and head.C) inertia -- the back of your seat pushes your backforward but your head tends to stay where it was.D) inertia – you resist the motion of the car.E) none of these
C) Newton’s first law…
What keeps asteroids moving through (mostly empty)space, as they have been doing for billions of years?A) InertiaB) Gravitational forcesC) Electrical forcesD) Action-reaction forcesAnswer: AInertia – from Newton’s first law, an object in motiontends to remain in motion, in a uniform straight line,unless acted on by a force…
A truck is moving at constant velocity. Inside the storage
compartment, a rock is dropped from the midpoint of theceiling and strikes the floor below. The rock hits the floor A) Behind the midpoint of the ceilingB) Ahead of the midpoint of the ceilingC) Exactly below the midpoint of the ceilingD) Need more information to solve thisE) None of the above
If a car speeds up from rest to 100 km/h in 20 seconds,
its acceleration is A) 100 km/(h.s)B) 2000 km/(h.s)C) 10 km/(h.s)D) 5 km/(h.s)E) None of the above
If a car speeds up from rest to 100 km/h in 20 seconds,
its acceleration is A) 100 km/(h.s)B) 2000 km/(h.s)C) 10 km/(h.s)D) 5 km/(h.s)E) None of the aboveAnswer:DAcceleration = (change in speed)/time = (100 km/h)/(20 s)
A rock weighs 30 N on Earth. How much would it weigh
on the moon? Note g on the moon is one-sixth thaton earth. A) 180 NB) 30 NC) 5 ND) 0 NE) None of the above Answer: C, since weight =
mg
and
g
is 1/6 on the moon compared to that on
earth.What if the question asked about the mass – what is its mass on the moon ?(take
g
= 10 m/s
2 on the earth)
Answer: the same as that on earth, i.e. Mass = weight/
g^
= (30 N)/(10 N/kg) =
3 kg
An object is thrown down from the top of a cliff at a speed
of 10 m/s. Neglecting air-resistance, it’s speed a secondlater is about A) 20 m/sB) 15 m/sC) 10 m/sD) 0 m/sE) None of the above
2 unless otherwise stated
If you drop an object, it will accelerate downward at arate of 9.8 meters per second per second. If you insteadthrow it upwards, its acceleration (in the absence of airresistance) will beA) 9.8 meters per second per second.B) greater than 9.8 meters per second per second.C) less than 9.8 meters per second per second.
If you drop an object, it will accelerate downward at arate of 9.8 meters per second per second. If you insteadthrow it upwards, its acceleration (in the absence of airresistance) will beA) 9.8 meters per second per second.B) greater than 9.8 meters per second per second.C) less than 9.8 meters per second per second.
Answer: A Acceleration due to gravity is always this.
If an object falling freely were equipped with an odometer tomeasure the distance it travels, then the amount of distanceit travels each succeeding second would beA) constantB) less and less each secondC) greater than the second beforeD) doubledAnswer: CThe distance covered by a falling object increases as t
2
A man pulls a sled with a force of 100 N on ice,
accelerating it at 4 meters per second per second.What is the mass of the sled? A)100 kgB) 50 kgC) 40 kgD) 25 kgE) 20 kg
If no external forces are acting on a moving object it willA) move slower and slower until it finally stops.B) continue moving at the same velocity.C) continue moving at the same speed.
If no external forces are acting on a moving object it willA) move slower and slower until it finally stops.B) continue moving at the same velocity.C) continue moving at the same speed.
B) By Newton’s first law
