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大学物理教程第二章(Second chapters of College Physics)
大学物理教程第二章(Second chapters of College Physics)
Problem 2
2-1 the mass of 16KG particles in the plane movement, by a constant force, force component, at that time,,,. At that time, begged:
(1) the vector of particles;
(2) the velocity of particles.
Solution: Yes, there is:,
(1),
.
So the velocity of the particle at the time:
(2)
2-2 the mass of 2kg particles in the XY plane movement, subject to external force, t=0, its initial velocity is t=1s, the particle velocity and the normal force.
Solution: because of the motion in plane, so the vector is considered.
By: there are two points on both sides:
Hence,
Considering, there are
Because in the natural coordinates, and, (when), in that, so the tangential velocity direction is the direction, the normal force is the direction of use, will fit into a star.
Figure 2-3., A, B object B in the same quality, smooth level desktop. The pulley and the rope as well as the quality of the air resistance are neglected, the friction between the shaft and the pulley are neglected. The system without initial release, the number of objects is A the whereabouts of the acceleration?
Solution: stress analysis of A and B is carried out respectively:
Can be calculated:.
Figure 2-4., with the quality of the car carrying a quality wooden board and the bottom friction coefficient between the rolling friction between vehicle and pavement, the calculation can be ignored, pulling force is how to ensure the box does not slide?
Method: according to the problem, to make the box not to slip, must have the same acceleration and wooden floor board, and the upper limit for the maximum friction and bottom.
That is:
Available:
Solution two: set the wooden box, not to slide the maximum pulling force for the column type:
Simultaneous:,
Have:.
2-5. as shown in the diagram, an inclined plane is placed on the horizontal surface and a block is placed on the slope. The friction coefficient between them is. In order to keep the block relative to the slope at rest, the
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