Advertisements
Advertisements
Question
Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
Advertisements
Solution
- If the net external force on the cabinet is zero, it will move at a constant velocity.
- Because a horizontal force of 200 N acts on the cabinet in the forward direction, a frictional force of 200 N will act on it, resulting in a net external force of zero.
- Thus, a frictional force of 200 N will be applied to the cabinet.
APPEARS IN
RELATED QUESTIONS
If action is always equal to the reaction, explain how a horse can pull a cart.
If action is always equal to reaction, explain why a cart pulled by a horse can be moved.
Explain how a rocket works.
Do action and reaction act on the same body or different bodies ? How are they related in magnitude and direction ? Are they simultaneous or not ?
Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to go backward.
Give a scientific reason.
Even though the magnitudes of action force and reaction forces are equal and their directions are opposite, their effects do not get cancelled.
While catching a cricket ball the fielder lowers his hands backwards. Why?
Consider a frame that is made up of two thin massless rods AB and AC as shown in the figure. A vertical force `vec"P"` of magnitude 100 N is applied at point A of the frame.
Suppose the force is `vec"P"` resolved parallel to the arms AB and AC of the frame.
The magnitude of the resolved component along the arm AC is xN.
The value of x, to the nearest integer, is ______.
[Given: sin(35°) = 0.573, cos(35°) = 0.819, sin(110°) = 0.939, cos(110°) = –0.342]
In a hose pipe ejecting water, what is the reaction force?
What is the main characteristic of action and reaction forces?
