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Is work done if you lift a brick?
Yes, work is done when you lift a brick against gravity because you are exerting a force over a distance in the direction of the force of gravity. Work is defined as force multiplied by distance in the direction of the force, so lifting the brick requires work to be done.
How much work is done if a force of 20 N is applied on an object that remains stationary?
No work is done because work is the product of force applied and displacement in the direction of the force. Since the object remains stationary, there is no displacement in the direction of the force, so no work is done.
If a force of 100 newtons was exerted on an object and no work was done the object must have?
If no work was done, the object must not have moved in the direction of the force. This could happen if the force was applied perpendicular to the object's motion or if the object remained stationary.
If you push for an hour against a stationary wall you do no work?
That's correct. Work is only done when a force causes an object to move in the direction of the force, so pushing against a stationary object, like a wall, does not result in any work being done.
What is the work done on the 10N of brick when it is pushed by a 70N of horizontal force over a distance of 10m?
The work done on the brick is 700 J. Work is calculated as force multiplied by distance, so 70 N * 10 m = 700 J.
Is work done if you lift a brick?
Yes, work is done when you lift a brick against gravity because you are exerting a force over a distance in the direction of the force of gravity. Work is defined as force multiplied by distance in the direction of the force, so lifting the brick requires work to be done.
How much work is done if a woman is pushing a cart with 500N force along the 7m aisle?
Just multiply the force times the distance. This assumes the force is applied in the direction of the movement.
How much work is done if a force of 20 N is applied on an object that remains stationary?
No work is done because work is the product of force applied and displacement in the direction of the force. Since the object remains stationary, there is no displacement in the direction of the force, so no work is done.
If a force of 100 newtons was exerted on an object and no work was done the object must have?
If no work was done, the object must not have moved in the direction of the force. This could happen if the force was applied perpendicular to the object's motion or if the object remained stationary.
If you push for an hour against a stationary wall you do no work?
That's correct. Work is only done when a force causes an object to move in the direction of the force, so pushing against a stationary object, like a wall, does not result in any work being done.
What is the work done on the 10N of brick when it is pushed by a 70N of horizontal force over a distance of 10m?
The work done on the brick is 700 J. Work is calculated as force multiplied by distance, so 70 N * 10 m = 700 J.
Can work be done if there is no motion?
Yes, work can still be done even if there is no motion. Work is defined as the force applied over a distance, so as long as there is a force acting on an object in the direction of the force, work is being done. If an object is stationary but has a force applied to it, work is still being done even though there is no motion.
Why is it easy to push a brick gently but gets hurt when kick it?
Inertia. It takes force to overcome the brick's weight and friction. If applied slowly, the work can be done with deforming your foot. Done quickly, and the fleshy part of your foot will be squashed, before the brick starts to move.
What is an example in which a force is exerted on an object without doing work on the object?
Pushing against a stationary wall is an example where a force is exerted on the wall, but no work is done on the wall since it does not move. Work is only done when a force causes an object to move over a distance in the direction of the force.
Calculate the work done in lifting a 500-N barbell 2.2m above the floor what is the potential energy of the barbell when it is lifted to this height?
The work done in lifting the barbell is given by the formula: Work = force x distance = 500 N x 2.2 m = 1100 J. The potential energy of the barbell at this height is equal to the work done, so it would also be 1100 J.
If you push for an hour against a stationary wall you do no work why?
Work is calculated as force multiplied by displacement in the direction of the force. In this scenario, since the wall doesn't move, there is no displacement in the direction of the force. Therefore, no work is done on the wall.
How much work is done by a weight lifter when he holds a weight of 80kgs on his shoulder for two minutes?
none. work is done when a force is applied thru a distance. holding something stationary does no work.
