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Newton's First Law

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Physics 100A Homework 4 – Chapter 5
Newton’s First Law
A)
If a car is moving to the left w ith constant velocity then the ne t force applied to the car is zero.
B)
An object cannot remain at rest unless the net fo rce acting on it is zero.
C)
An object has constant acceleration if the net force acting on it is constant.
Understanding Newton’s Laws
A)
An object cannot remain at rest unle ss the net force acting on it is zero.
B)
If a block is moving to the left with constant ve locity the net force applied to the block is zero.
C)
A block of mass 2 kg is acted upon by two forces: 3N (d irected to the left) and 4N (directed to the right). What can you say about the block's motion?
The net force is point to th e right, so the object could
- be moving to the right and acceler ating to the right (speeding up)
- be moving to the left and acceler ating to the right (slowing down)
- be at rest and on the ve rge of moving to the right
D)
A block pulled with a constant force will have a constant acceleration in th e same direction as the force. E)
Two forces, of magnitude 4N and10N, are applied to an obj ect. The relative direction of the forces is unknown.
The two limits for adding the forces give that the magnitude of the net force must be
NFN
net
14
6
≤≤
So 5N is excluded
Free-Body Diagrams
Chadwick is pushing a piano across a level floor (see the figure). (
Intro 1 figure
) The piano can slide across the floor without friction. If Chadwick applies a horizontal fo rce to the piano, what is the piano's…...

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