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What is the minimum work needed to push a 380-kg car 170 m up a 7.5º incline with friction?
The work done against gravity is given by: W = mgh = (380 kg)(9.8 m/s^2)(170 m)sin(7.5º) The work done against friction is given by: W_friction = f_friction * d = µ * m * g * d, where d is the distance moved. The total work done is the sum of the work against gravity and friction: Total work = W + W_friction.
When is work said to be done against the force of gravity?
All bodies with mass are attracted to the Earth by gravity, so when a body is raised you must do work to raise it. This work is equal to force x height, if force is in Newtons and height in meters, the work is in units of Joules.
Is friction produced when work is done?
Yes, friction is produced when work is done. When two surfaces rub against each other, heat is generated due to the resistance caused by friction. This results in the conversion of some of the work done into thermal energy.
How to calculate the work done by friction in a given system?
To calculate the work done by friction in a system, you can use the formula: Work Force of friction x Distance. First, determine the force of friction acting on the object. Then, multiply this force by the distance the object moves against the frictional force. This will give you the work done by friction in the system.
What is amount of work done by a locomotive against gravity if it is travelling in a level of plane.?
If the locomotive is traveling on a level plane, the amount of work done against gravity is zero. This is because the force of gravity is acting perpendicular to the direction of motion. Work is only done when the force and displacement are in the same direction.
What is the minimum work needed to push a 380-kg car 170 m up a 7.5º incline with friction?
The work done against gravity is given by: W = mgh = (380 kg)(9.8 m/s^2)(170 m)sin(7.5º) The work done against friction is given by: W_friction = f_friction * d = µ * m * g * d, where d is the distance moved. The total work done is the sum of the work against gravity and friction: Total work = W + W_friction.
Why when you push an object across a desk the work done is not equal to the change in gravitational potential energy?
In this case, you are not doing work against the force of gravity, but against the force of friction.
How do you know when work is being done and when its not?
The object may move against a force, for example be raised against gravity, or it may accelerate ie go faster, or it may get warmer for example by friction.
When is work said to be done against the force of gravity?
All bodies with mass are attracted to the Earth by gravity, so when a body is raised you must do work to raise it. This work is equal to force x height, if force is in Newtons and height in meters, the work is in units of Joules.
What is a sign that work is being done?
The object may move against a force, for example be raised against gravity, or it may accelerate ie go faster, or it may get warmer for example by friction.
Is friction produced when work is done?
Yes, friction is produced when work is done. When two surfaces rub against each other, heat is generated due to the resistance caused by friction. This results in the conversion of some of the work done into thermal energy.
How to calculate the work done by friction in a given system?
To calculate the work done by friction in a system, you can use the formula: Work Force of friction x Distance. First, determine the force of friction acting on the object. Then, multiply this force by the distance the object moves against the frictional force. This will give you the work done by friction in the system.
What is amount of work done by a locomotive against gravity if it is travelling in a level of plane.?
If the locomotive is traveling on a level plane, the amount of work done against gravity is zero. This is because the force of gravity is acting perpendicular to the direction of motion. Work is only done when the force and displacement are in the same direction.
Can work be done by friction?
Yes, work can be done by friction. When an object moves against a surface due to friction, work is done to overcome the resistance offered by the frictional force. This work results in heat production and can cause the object to experience a change in its kinetic energy.
What is the work done against the gravity when a body is moved horizontally along a frictionless surface?
No work is done against gravity when a body is moved horizontally along a frictionless surface because the force of gravity acts perpendicular to the direction of motion. Work is only done when a force is exerted in the direction of motion.
When a force moves objects over a rough horizontal surface at a constant velocity the work done against friction must?
When a force moves objects over a rough horizontal surface at a constant velocity, the work done against friction must be equal to the work done by the applied force to maintain the constant velocity. This is because the force of friction opposes the motion of the object, so the work done by the applied force must overcome the work done by friction to keep the object moving at a constant speed.
How does the work done on a sliding block with friction affect its potential energy?
When work is done on a sliding block with friction, it can either increase or decrease the block's potential energy, depending on the direction of the force applied. If the work is done against the force of friction, the potential energy of the block increases. Conversely, if the work is done in the direction of the force of friction, the potential energy of the block decreases.
