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Friction And Circular Motion
Test Description: Friction and the factors that affect it.
Instructions: Answer all questions to get your test result.
1) Compared to the force needed to start sliding a crate across a rough level floor, the force needed to keep it sliding once it is moving is
A
greater
B
less
C
the same
2) Which statement best explains why a “wet saw” used to cut through fine optical crystals is constantly lubricated with oil?
A
Lubrication increases friction and minimizes the increase of heat energy.
B
Lubrication decreases friction and maximizes the increase of heat energy.
C
Lubrication increases friction and maximizes the increase of heat energy.
D
Lubrication decreases friction and minimizes the increase of heat energy.
3) A box is pushed to the right across a classroom floor. The force of friction on the box is directed toward the
A
floor
B
right
C
left
D
ceiling
4) When a 12N horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of static friction acting on the box is
A
12N
B
greater than 12N
C
0N
D
between 0N and 12N
5) When an object moves at a constant speed against friction on a horizontal tabletop, there is an increase in the object's
A
potential energy
B
temperature
C
momentum
D
acceleration
6) A 50.-Newton horizontal force is needed to keep an object weighing 500. Newtons moving at a constant velocity of 2.0 meters per second across a horizontal surface. The magnitude of the frictional force acting on the object is
A
0N
B
50N
C
450N
D
500N
7) A wooden block is at rest on a horizontal steel surface. If a 10.-Newton force applied parallel to the surface is required to set the block in motion, how much force is required to keep the block moving at constant velocity?
A
less than 10N
B
greater than 10N
C
10N
8) Sand is often placed on an icy road because the sand
A
decreases the force of friction between the tires of a car and the road
B
decreases the gravitational force on a car
C
increases the force of friction between the tires of a car and the road
D
increases the normal force of a car on the road
9) In order to keep an object weighing 20 Newtons moving at constant speed along a horizontal surface, a force of 10 Newtons is required. The force of friction between the surface and the object is
A
20N
B
0N
C
30N
D
10N
10) As the surface area of a block increases, what happens to the force of friction?
A
increases
B
remains the same
C
decreases
11) An object travels in a circular orbit. If the speed of the object is doubled, its centripetal acceleration will be
A
halved
B
doubled
C
quartered
D
quadrupled
12) If the mass of the cart was doubled, the magnitude of the centripetal acceleration of the cart would be
A
halved
B
doubled
C
unchanged
D
quadrupled
13) While the object is undergoing uniform circular motion, its acceleration
A
is directed toward the center of the circle
B
is directed away from the center of the circle
C
has a magnitude of zero
D
increases in magnitude
14) Centripetal acceleration of a ball moving at constant speed around a flat horizontal circle is
A
constant in magnitude, but changing in direction
B
constant in direction, but changing in magnitude
C
changing in both magnitude and direction
D
zero
15) A ball of mass M at the end of a string is swinging in a horizontal circular path of radius R at constant speed V. Which combination of changes would require the greatest increase in the centripetal force acting on the ball?
A
halving V and doubling R
B
doubling V and halving R
C
doubling V and doubling R
D
halving V and halving R
*select an answer for all questions
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