which 2 conditions should be fulfilled for a body to move with constant velocity
Answers
Answer:
Newton's first law states that an object at rest tends to remain at rest, and an object in motion tends to remain in motion with a constant velocity (constant speed and direction of motion), unless it is acted on by a nonzero net force. Note that the net force is the sum of all the forces acting on an object
Answer:
The first condition of equilibrium is that the net force in all directions must be zero.
First Condition of Equilibrium
For an object to be in equilibrium, it must be experiencing no acceleration. This means that both the net force and the net torque on the object must be zero. Here we will discuss the first condition, that of zero net force.
In the form of an equation, this first condition is:
F
net
=
0
.
In order to achieve this conditon, the forces acting along each axis of motion must sum to zero. For example, the net external forces along the typical x– and y-axes are zero. This is written as
net
F
x
=
0
and
net
F
y
=
0
.
The condition
F
net
=
0
must be true for both static equilibrium, where the object’s velocity is zero, and dynamic equilibrium, where the object is moving at a constant velocity.
Below, the motionless person is in static equilibrium. The forces acting on him add up to zero. Both forces are vertical in this case.
image
Person in Static Equilibrium: This motionless person is in static equilibrium.Second Condition
The second condition of static equilibrium says that the net torque acting on the object must be zero.child’s seesaw, shown in, is an example of static equilibrium. An object in static equilibrium is one that has no acceleration in any direction. While there might be motion, such motion is constant.
image
Two children on a seesaw: The system is in static equilibrium, showing no acceleration in any direction.
If a given object is in static equilibrium, both the net force and the net torque on the object must be zero. Let’s break this down:
Net Force Must Be Zero
The net force acting on the object must be zero. Therefore all forces balance in each direction. For example, a car moving along a highway at a constant speed is in equilibrium, as it is not accelerating in any forward or vertical direction. Mathematically, this is stated as Fnet = ma = 0.
Net Torque Must Be Zero
The second condition necessary to achieve equilibrium involves avoiding accelerated rotation (maintaining a constant angular velocity ). A rotating body or system can be in equilibrium if its rate of rotation is constant and remains unchanged by the forces acting on it.