a bowling ball and a baseball accelerate equally when falling in a vacuum because...
answer
the ratio of their weights to mass is the same.
question
if you double the net force on an object, you'll double its...
answer
acceleration.
question
if an apple experiences a constant net force, it will have a constant...
answer
acceleration.
question
a feather and a coin will have equal accelerations when falling in a vacuum because...
answer
the ratio of both the feather's and coin's weight to mass is the same.
question
a constant net force on a rail-road car produces constant...
answer
acceleration.
question
a rock weighs 30N on earth and another rock weights 30N on the moon. which has greater mass?
answer
the one on the moon.
question
which has zero acceleration?
answer
moving at constant velocity, mechanical equillibrium, at rest.
question
a heavy rock and a light rock of the same size are falling through the air from a tall building. the one that encounters the greatest air resistance is the...
answer
heavy rock.
question
an apple at rest weighs 1N. the net force on the apple when it is in free fall is...
answer
1N
question
when a constant and sustained upward force acts on a rocket, its acceleration increases mainly because...
answer
the mass of the rocket decreases as fuel is burned.
question
a ball is thrown vertically into the air. because of air resistance, its speed when it returns to its starting level compared with its inital speed is...
answer
less.
question
a 300-kg bear grasping a vertical tree slides down at constant velocity. the friction force between the tree and the bear is...
answer
3000N.
question
the human body can withstand an acceleration of 10g under certain conditions. what net force would produce this acceleration for a 50-kg person?
answer
5000N.
question
an object's weight is properly expressed in units of...
answer
newtons.
question
compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much...
answer
volume, mass, inertia.
question
suzie skydiver, who weighs 500N, reaches terminal velocity of 90 km/h. the air resistance on suzie is then...
answer
500N.
question
a skydiver steps from a helicopter and falls for a few seconds until terminal velocity is reached. thereafter until he opens his parachute, his acceleration...
answer
is zero.
question
two tennis balls fall through the air from a tall building. one of them is filled with lead pellets. the ball to reach the ground first is the...
answer
led filled.
question
compared to the mass of an apple on earth, the mass of an apple on the moon is...
answer
the same.
question
compared to a 1-kg block of solid iron, a 2-kg block of iron has the same...
answer
nothing.
question
your weight as measured on your bathroom scale is..
answer
the force due to gravity on you.
question
which has the greater mass...
answer
an automobile battery.
question
the mass of a lamb that weighs 110N is about...
answer
11kg.
question
an object with twice as much mass as another object has twice as much...
answer
inertia.
question
a heavy ball hangs by a string, with a second string attatched to its bottom. a quick pull on the bottom string breaks the...
answer
bottom string.
question
suzie skydiver jumps from a high flying plane. as her velocity of fall increases, her acceleration...
answer
decreases.
question
a newton is a unit of...
answer
force.
question
a 10-kilogram block with an initial velocity of 10m/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...
answer
50N.
question
the force of friction on a sliding object is 10N. the applied force needed to maintain the constant velocity is...
answer
10N.
question
when the bottom string is pulled slowly in the ehavy ball and string demonstration, tension...
answer
in the top string is due to your pull plus the weight of the ball.
question
if the mass of a cart is quickly loaded to have twice the mass while a propelling force remains constant, the cart's acceleration...
answer
halves.
question
an apple weights 1N. when the apple is held at rest above your head, the net force on the apple is...
answer
0N.
question
if you are driving at 20m/s and slam on your brakes and skid at 0.5g to a full stop the skidding time is about...
answer
4 seconds.
question
two factors that greatly affect air resistance on falling objects are frontal area and...
answer
speed.
question
when a falling object has reached its terminal velocity, its acceleration is...
answer
zero.
question
when you stand at rest with your left foot on one bathroom scale and your right foot on a similar scale, each of scales will..
answer
show readings that when added equal your weight.
question
a light woman and a heavy man jump from an airplane with the same time and open their same size parachutes at the same time. which person will get to the ground first?
answer
heavy man.
question
a kilogram is a measure of an objects...
answer
mass.
question
the mass of a pet turtle that weighs 10N is about...
answer
1kg.
question
at equillibrium on a bathroom weighing scale, the downward pull of gravity on you is balanced by...
answer
an upward support force.
question
a heavy ball hangs by a string, with a second string attached to its bottom. a slow pull on the bottom string breaks...
answer
the top string.
question
a car by itself is capable of a certain maximum acceleration. when it tows a car of the same mass, its maximum acceleration is...
answer
one half.
question
phil stands at rest with both feet on a scale that reads 500N. when he gently lifts one food, the scale reads...
answer
500N.
question
a car has a mass of 1000kg and accelerates at 2m/s^2. what net force is exerted on the car?
answer
2000N.
question
a 500N parachutist opens his chute and experiences an air resistance force of 800N. the net force on the parachutist is then...
answer
300N upward.
question
a 10N falling object encounters 4N of air resistance. the net force on the object is...
answer
6N.
question
a 10N falling objects encounters 10N of air resistance. the net force on the object is...
answer
0N.
question
a tow truck exerts a force of 3000N on a car, which then accelerates at 2m/s^2. what is the mass of the car?
answer
1500kg.
question
whenever the net force on an object is zero, its acceleration is...
answer
zero.
question
A rock band's tour bus, mass (M), is accelerating away from a STOP sign at rate (a) when a piece of heavy metal, mass (M/6), falls onto the top of the bus and remains there.
a. Show that the bus's acceleration is now 6/7a.
b. If the initial acceleration of the bus is 1.2 m/s^2, show that when the bus carries the heavy metal with it, the acceleration will be 1.0m/s^2.
answer
Initially:
F = ma
Finally:
F = (m + m/6)a'
Therefore:
ma = (m + m/6)a'
a = (7/6)a'
(6/7)a = a'
(6/7)(1.2) = 1.0 m/s²
question
When a 20-N falling object encounters 5 N of air resistance, its acceleration of fall is
answer
less than g.
question
If a 50-N person is to fall at terminal speed, the air resistance needed is
answer
50 N.
question
As the skydiver falls faster and faster through the air, air resistance
answer
increases.
question
As the skydiver continues to fall faster and faster through the air, net force
answer
decreases.
question
As the skydiver continues to fall faster and faster through the air, her acceleration
answer
decreases.
question
Consider a heavy and a light person jumping together with same-size parachutes from the same altitude. Who will reach the ground first?
answer
heavy person.
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