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

Which statement best explains why a “wet saw” used to cut through fine optical crystals is constantly lubricated with oil?

A box is pushed to the right across a classroom floor. The force of friction on the box is directed toward the

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

When an object moves at a constant speed against friction on a horizontal tabletop, there is an increase in the object's

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 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?

Sand is often placed on an icy road because the sand

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

As the surface area of a block increases, what happens to the force of friction?

An object travels in a circular orbit. If the speed of the object is doubled, its centripetal acceleration will be

If the mass of the cart was doubled, the magnitude of the centripetal acceleration of the cart would be

While the object is undergoing uniform circular motion, its acceleration

Centripetal acceleration of a ball moving at constant speed around a flat horizontal circle is

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?

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