6. jim wishes to push a 100. n wood crate across a wood floor. what is the minimum horizontal force that would be required to start the crate moving?

50 N

Explanation:

The minimum horizontal force required to start the crate moving must be equal to the maximum force of static friction that acts between the floor and the crate.

The maximum force of static friction is given by:

where

is the coefficient of static friction

is the normal reaction exerted by the floor on the crate.

For wood-wood, as in this case, the maximum coefficient of static friction is about .

For a horizontal surface, the normal reaction is equal to the weight of the object, so in this case . Therefore, the minimum horizontal force required will be:

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the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.