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What is difference between an object moving with uniform acceleration and an object moving with a constant velocity?
A motion with a constant speed will always be moving the same speed A motion with a constant acceleration will constantly be gaining speed, and does not remain moving at the same speed.
When will a net force increase an object's velocity?
Assuming zero friction, the object will increase in velocity as long as an unopposed force is applied. So long as the net force has a magnitude to overcome the static friction (and is constantly applied once the object is in motion) then the object will accelerate with respect to the difference between the force of kinetic friction and net force. Force is measured in Newtons ((kg*(m/(s^2)) which is mass*acceleration) so the equation for force is F=m*a. To find the acceleration, the net force, F, divided by mass, m, will leave you with Newtons/mass on one side of the equation and acceleration on the other (m/(s^2)). Example: A 2kg block is pushed with a net force of 6N in one direction on a horizontal plane. The static friction constant between the block and the surface is 0.3 and the kinetic friction constant is 0.1. The block has a weight of 19.6N (mass*gravity) and will have a normal force of the same value (Fn=W). The force required to put the object into motion will be (static friction constant)*Fn, or 19.6N*0.3 = 5.88N. Since this number is less than the net force applied to the block, the block will begin to move. From this point on, if the force is constant, the net force in that direction will be higher (as the kinetic friction constant is smaller than the static friction constant). The new frictional force will be 19.6N*0.1 = 1.96N. Thus, the net force in the direction of motion is 4.04N. (4.04N)/(2kg) = 2.02 m/(s^2). The block will be moving at 2.02m/s at one second, 4.04 at two seconds and so on.
What is the Difference between Uniform motion and uniform acceleration?
Uniform motion is when an object moves with a constant speed in a straight line. Uniform acceleration is when an object's velocity changes at a constant rate. In uniform acceleration, the speed of the object increases or decreases by the same amount over equal time intervals.
What horizontal force P is required to drag a sack of rice weighing 110 pounds. in a horizontal floor if the coefficient of friction between the floor on the sack of rice is 0.25?
The force of friction acting on the sack of rice is the product of the coefficient of friction and the normal force, which in this case is the weight of the sack (110 pounds). Therefore, the force of friction is 0.25 * 110 = 27.5 pounds. The horizontal force required to overcome this friction and drag the sack of rice is equal to the force of friction, so a force of 27.5 pounds (P = 27.5 pounds) is required.
If an object is moving at unifrom acceleration what is its velocity?
A body moving at a uniform speed may have a uniform velocity, or its velocity could be changing. How could that be? Let's look. The difference between speed and velocity is that velocity is speed with a direction vector associated with it. If a car is going from, say, Cheyenne, Wyoming to the Nebraska state line at a steady speed of 70 miles per hour, its velocity is 70 miles per hour east. Simple and easy. Uniform speed equals uniform velocity. (Yes, I-80 isn't perfectly straight there. Let's not split hairs.) But a car moving around a circular track at a uniform speed is constantly changing direction. Its speed is constant, but its velocity is changing every moment because the directionit is going is changing. Speed is uniform, but velocity isn't. As asked, uniform speed is a uniform distance per unit of time. And this will yield a uniform distance per unit of time in its velocity, but the direction vector may be uniform or it may be changing each moment, as illustrated.
How much force do you need to keep a block at a constant velocity why?
To keep a block at a constant velocity, you need to apply a force equal in magnitude but opposite in direction to the force of friction acting on the block. This force is called the kinetic friction force and is dependent on the coefficient of friction between the block and the surface it's on.
What is steady friction?
Steady friction refers to the constant resistance that occurs when two surfaces slide against each other at a constant velocity. The friction force remains consistent as long as the relative motion between the surfaces is constant. This type of friction is important in engineering applications where precise control of motion is necessary.
How can frictional force be experimentally determined?
Frictional force can be experimentally determined by measuring the force required to overcome the friction between two surfaces in contact using a spring balance or a force sensor. By gradually increasing the force until motion starts, the static friction can be determined. For determining kinetic friction, the force required to keep the surfaces in motion at a constant velocity can be measured.
What is the different between constant velocity and constant speed?
constant velocity is when you maintain speed and direction, this usually is in a straight line, and constant speed means that your speed is always constant at all times.
What force is needed to slide a 250-kg crate across the floor at constant velocity if the coefficient of sliding friction between a crate and a horizontal floor is 0.25?
The force needed to slide the crate at constant velocity is equal in magnitude but opposite in direction to the force of friction. The force of friction can be calculated as the product of the coefficient of friction and the normal force acting on the crate (weight of the crate). Therefore, the force needed would be 250 kg * 9.8 m/s^2 * 0.25 = 612.5 N.
State laws of friction?
Static friction: the force that resists the initial movement of an object at rest. Kinetic friction: the force that opposes the motion of an object already in motion. The coefficient of friction: a constant that measures the friction between two surfaces.
What is the difference between uniform velocity and constant velocity?
Uniform velocity means that an object is moving in a straight line at a constant speed, while constant velocity adds the additional condition of moving with a constant speed and direction. In other words, constant velocity implies both uniform speed and no change in direction.
A block is dragged at constant velocity in a straight-line path across a level surface by a force of 6 N what is the force of friction between the block and the surface?
'Constant velocity' means constant speed and direction. If the speed of the block is constant along the level block, then the net force on it in the forward direction must be zero. (It isn't accelerating.) You're pulling it in the forward direction with a force of 6 N. So the force of friction in the opposite direction must also be 6 N, for a total of zero.
How does friction affect the velocity of a train?
Friction between the train wheels and the tracks can slow down the velocity of a train by converting its kinetic energy into heat. Higher friction can cause more resistance, which can decrease the train's velocity. Conversely, lower friction or well-lubricated tracks can reduce the impact of friction on the train's velocity.
What is the relationship between velocity, time, and displacement when acceleration is constant?
When acceleration is constant, the relationship between velocity, time, and displacement can be described by the equations of motion. The velocity of an object changes linearly with time when acceleration is constant. The displacement of the object is directly proportional to the square of the time elapsed.
Why is kinetic friction independent of velocity?
Kinetic friction is independent of velocity because it arises from the interactions between two surfaces in contact, rather than the motion of the objects. As the objects slide past each other, the microscopic roughness of the surfaces at the contact point results in resistance that remains constant regardless of how fast the objects are moving.
What is the difference between constant velocity and variable velocity?
Constant velocity has speed always constant along the direction with respect to time. Variable velocity changes its speed with respect to time. Constant velocity has zero acceleration. Variable velocity has non-zero acceleration . An object moving at a constant velocity maintains both the same speed and direction. An object moving at a variable velocity can be changing speed or direction of travel or both.
