Worksheets1120 Circular Motion & Universal Gravitation Review
Total questions: 20
Worksheet time: 2hrs 40mins
A record with a radius of 0.4 m is spinning at a rate of 1 m/s. What would the centripetal acceleration be for a piece of gum stuck to the outside edge of the record?
2.5 m/s/s
-9.8 m/s/s
0.4 m/s/s
0.16 m/s/s
A 30 kg child is on the merry-go-round which has a radius of 1.5 m. Her sister spins her at a velocity of 9 m/s. What is the centripetal force?
180 N
405 N
1,620 N
54 N
A tin can whirled on the end of a string moves in a circle because __________.
once the can starts moving, that is its natural tendency.
gravity acts on the can.
there is a force on the can pulling it away from the center.
there is a force acting on the can toward the center of the circle.
An object moving in a circle at a constant speed is accelerating because _____.
a centrifugal force is acting on it
net forces are acting outward
the direction of its velocity is changing
the length of its radius is changing
A car travels in a circle with constant speed. The net force on the car __________.
is directed forward, in the direction of travel.
is directed toward the center of the curve.
is zero because the car is not accelerating.
none of these are correct
A steel ball is attached to a string and is swung in a circular path as illustrated in the attached figure. At the point P, the string suddenly breaks. Which path would the ball most closely follow after the string breaks?
A
B
C
D
In what direction does centripetal force point?
toward the center of the circle
outwards
tangent to the circle
nowhere
In what direction does centripetal acceleration point?
toward the center
outwards
tangent to the circle
nowhere
What does centripetal force depend on?
mass
velocity
radius of the circle
all of these are correct
What would happen to the gravitational force felt between two objects if the radius between them were doubled?
Fg would double
Fg would cut in half
Fg would divide by four
Fg would stay the same
What provides the centripetal force for a ball on a string being twirled in a circle?
Friction force
Inertia
Tension force
Air resistance
What would happen to the gravitational force felt between two planets if the mass of one planet were doubled?
Fg would cut in half
Fg would double
Fg would stay the same
Fg would be divided by four
A ball is tied to a string and swung in a circle. If the speed of the ball is doubled _________.
Fc would double
Fc would cut in half
Fc would quadruple
Fc would stay the same
Newton found that the gravitational force between two masses is inversely proportional to the square of ____.
the distance between them
the sum of the masses
the product of the masses
the strength of the gravitational field
An increase in the strength of the gravitational field surrounding an object results from an increase in that object’s ____.
orbit
mass
density
radius
The factors that affect the gravitational force between two objects are _____.
size and distance
mass and size
density and distance
mass and distance
An object with mass experiences a force when placed in a(n) ________________________.
gravitational field
state of free fall
gravitational acceleration
orbital velocity
As an astronaut travels from the surface of the earth to a position that is four times as far away from the center of the earth, the astronaut’s
mass decreases
mass remains the same
weight increases
weight remains the same
A student is performing an experiment where he is able to measure the force of gravity between two masses (m1 and m2). Based on the data in the table, what claim can he make about how the force of gravity is related to the size of the masses?
Mass one is directly proportional to the force
Mass two is inversely square proportional to the force
Both masses are inversely proportional to the force
Both masses are directly proportional to the force
Mars has two moons, Phobos and Deimos, which both have about the same mass. The force of gravity between Mars and Phobos is much stronger than the force of gravity between Mars and Deimos. Which of the following statements is true about the two moons?
Deimos is much closer to Mars than Phobos
Phobos is much closer to Mars than Deimos
The moons are the same distance away from Mars
The gravity between the two moons makes it impossible to determine which is closer to Mars
