A body is said to be in motion when it changes its position with respect to its immediate sorroundings and it is at rest when it does no changes its position with respect to its sorroundings (immediate).
A body that is not moving is said to be at rest.
A body at rest and a body in motion have completely different velocities.Magnitude of velocity:At rest . . . zeroMoving . . . not zeroDirection of velocity:At rest . . . no directionMoving . . . some direction
yes!A2. The real problem is deciding when a body is at rest - or is it just the rest of the universe that is moving?
A body is in complete equilibrium when the net force acting on it is zero and the net torque around any point is also zero. This means the body is at rest or moving at a constant velocity with no rotations occurring.
the slope of distance time graph gives us velocity but when the body is at rest it will be zero
A body that is not moving is said to be at rest.
At rest.
A body at rest and a body in motion have completely different velocities.Magnitude of velocity:At rest . . . zeroMoving . . . not zeroDirection of velocity:At rest . . . no directionMoving . . . some direction
Static inertia is when a body at rest wants to stay at rest, or a body that is moving at a constant speed stays at the constant speed.
about a hour
It means there are no unbalanced forces, or the net force is zero. That means if a t rest it will stay at rest, or if in motion it will stay in motion with no acceleration.It means that there is no net force acting on the object(s). A body moving at constant velocity is in mechanical equilibrium. A body that is not moving is in static equilibrium.
Any body in the universe is never said to be rest as the electrons inside it keeps moving to and fro and thus no matter on the universe is in standard rest.
That means that it is moving.
yes!A2. The real problem is deciding when a body is at rest - or is it just the rest of the universe that is moving?
acceleration is a relative quantity . state of rest or motion is also relative . if two body is in rest or moving with same velocity and having same acceleration then one is in state of rest with respect to other . suppose a person sitting in a train then he is in rest with respect to train but he is moving with the acceleration of train with respect to the ground.
All motion is relative. The question "is this object moving?" is in fact meaningless unless we specify "moving relative to what other object". Similarly, there is no such thing as "absolute rest": it's just as true to say that the road is moving at 50 km/h relative to your car as it is to say that your car is moving at 50 km/h relative to the road.
Balanced forces occur when a body is at rest, and when a body is moving at a constant speed in a constant direction.