Which of the following physical quantities affect gravitational potential energy?
Mass and height
Near the Earth's surface, the gravitational potential energy of a body is given by U = mgh, where m is its mass, g is the acceleration due to gravity, and h is the height above a chosen reference.
Hence the two variable physical quantities that decide the value of U for a given body on Earth are its mass and its height above the reference level.
Temperature, colour, volume, shape, and speed do not appear in this expression; speed relates to kinetic energy, not gravitational potential energy.
Hence, mass and height are the quantities that affect gravitational potential energy.
A box is raised to the same height either by lifting it vertically or by pushing it up an ideal inclined plane. Which quantity is the same in both cases?
The work done to increase the kinetic energy of a 4 kg object from 50 J to 98 J is:
What form of energy does a glowing bulb emit?
According to the work-energy theorem, if the net work done on an object is zero, then its kinetic energy ________.
A car with a mass of 1000 kg is moving at a speed of 25 m/s. If the driver applies the brakes and brings the car to a stop, how much kinetic energy is lost during this process?
If a force of 1 N displaces an object by 1 m along the line of force, the work done is:
A trolley is pulled along a straight track by a constant force of 40 N. If the work done on the trolley is 240 J, what distance does the trolley travel?
An athlete of mass 60 kg runs at 5 m/s. What is the kinetic energy gained compared to standing still?
Which statement about power is correct?
A force of 45 N causes an object to move 3 m in the direction of the force. Calculate the work done.