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Why does a person do no work if he or she pushes against a car that is too heavy to move?
The equation for work is:
work = force x displacement or W = Fd
Since the car isn't moving, it has a displacement of zero. This therefore means that even though the force applied by the person on the car may be extremely large, the work done will be equal to zero.
For example, if the person exerts a force of 15000 N, the equation will look like this:
W = Fd
W = (15000 N) x (0 m)
W = 0 J
What else can I help you with?
Is physical work requiring energy being done if a person pushes on a locked door?
Yes because work is using energy to move something. Anytime we push-pull, work (energy) is used.
What is true of a real machine that enables a person to move a heavy object with little applied force?
I'd go with simple machines. Specifically, probably a pulley (or pulley system).
Do convergent plates move away from each other?
they move against one another
What happens to force when mass increases?
Say someone weighing 50 lbs sits down on a chair. Gravity pushes down on the person while the chair pushes upwards with enough force to keep the person up. Gravity pushes down with the same force all the time, it doesn't change.
2 examples of sliding friction?
1) If you push an eraser across a desk, the eraser will move for a short distance and then stop. 2) When you move a heavy dresser by pushing it along the floor.
What form of energy is being used when a person pushes heavy boxes across the floor?
Mechanical energy is being used when a person pushes heavy boxes across the floor. The person's muscles convert chemical energy into mechanical energy to move the boxes.
What from of energy is being used when a person pushes heavy boxes across the floor?
The energy being used is mechanical energy. When the person pushes the boxes, they are converting the chemical energy stored in their muscles into kinetic energy to move the boxes.
What is the name of the force that pushes agisnt an aireplane as it tries to move forward through the aire?
'Thrust' pushes against it from the rear, and 'drag' pushes against it from the front.
Why does a person move forward when he or she pushes on the sidewalk?
When a person pushes against the sidewalk, they exert a force in the opposite direction. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. This means the sidewalk exerts an equal and opposite force on the person, propelling them forward.
What makes piston move against gravity?
In the combustion process, the explosion pushes the piston down
When an object pushes against an object that cannot be squashed we get?
When an object pushes against an object that cannot be squashed, we get an increase in pressure. This increased pressure can lead to a reaction force that pushes back on the object, causing it to either move or stay in place, depending on the forces involved.
Is work done if a person pushes against a car and it doesn't move?
yes didnt you pay attention in physics? Actually this answer is wrong. You only do work if the car moves according to the laws of chemistry.
Why is the earths crust always moving?
Simple- Convection in the mantle causes mantle to slowly move, and it pushes against the crust. As it does this, the tectonic plates move.
Why a person who sits on the right hand sit making a left turn slides over the right?
The reason is Centrifugal force. If a car swerves around a corner, a passenger's body seems to move towards the outer edge of the car and then pushes against the door. It's because the car is changing direction and the person is is still going somewhat straight. The force causes the person to move against the door.
Why is it hard to move heavy things in space?
This question can be answered by considering law of consrevation of momentum, m1v1=m2v2. If a person pushes an object double his weight he will be sent with double the velocity in the opposite direction. on earth the person transfers the shoch to the ground so he doesnt move. that's why its hard to move heavy objects in space.
Example of what a force is applied but nothing happens?
When a person pushes against a solid brick wall, the force is applied but the wall does not move or respond. This is because the wall exerts an equal and opposite force back on the person, resulting in no change in the wall's position.
Why is the wind's energy able to move objects?
Because of friction. The kinetic energy in the wind pushes against the particles of the object.
