Friction And Circular Motion Question Preview (ID: 48710)


Friction And The Factors That Affect It. TEACHERS: click here for quick copy question ID numbers.

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) 0N
b) 10N
c) 20N
d) 30N

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) increases the force of friction between the tires of a car and the road
c) decreases the gravitational force on a car
d) increases the normal force of a car on the road

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
d)

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) 500N
b) 450N
c) 50N
d) 0N

When an object moves at a constant speed against friction on a horizontal tabletop, there is an increase in the object's
a) momentum
b) acceleration
c) potential energy
d) temperature

A box is pushed to the right across a classroom floor. The force of friction on the box is directed toward the
a) ceiling
b) left
c) right
d) floor

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) 0N
b) 12N
c) between 0N and 12N
d) greater than 12N

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 increases friction and maximizes the increase of heat energy.
c) Lubrication decreases friction and minimizes the increase of heat energy.
d) Lubrication decreases friction and maximizes the increase of heat energy.

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) less
b) greater
c) the same
d)

As the surface area of a block increases, what happens to the force of friction?
a) increases
b) decreases
c) remains the same
d)

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

If the mass of the cart was doubled, the magnitude of the centripetal acceleration of the cart would be
a) unchanged
b) halved
c) doubled
d) quadrupled

While the object is undergoing uniform circular motion, its acceleration
a) has a magnitude of zero
b) increases in magnitude
c) is directed toward the center of the circle
d) is directed away from the center of the circle

Centripetal acceleration of a ball moving at constant speed around a flat horizontal circle is
a) zero
b) constant in magnitude, but changing in direction
c) changing in both magnitude and direction
d) constant in direction, but changing in magnitude

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) doubling V and doubling R
b) halving V and doubling R
c) doubling V and halving R
d) halving V and halving R

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