Work and energy

Calculate the work done when a weight of 40 N is raised by a height of 5.0 m.

Calculate the work done when a spring is stretched to an extension of 0.45 m by a force of 20 N.

Calculate the energy transferred by a force of 12 N when it moves an object by a distance of 4.0 m in the direction of the force.

Calculate the energy transferred by a force of 12 N when it moves an object by a distance of 4.0 m in a direction at 60 degrees to the direction of the force.

Calculate the energy transferred by a force of 12 N when it moves an object by a distance of 4.0 m in a direction at right angles to the direction of the force.

A luggage trolley of total weight 400 N is pushed at a steady speed 20 m up a slope, by a force of 50 N acting in the same direction that the object moves. At the end of this distance, the trolley is 1.5 m higher than at the start. Calculate the work done pushing the trolley up the slope.

A luggage trolley of total weight 400 N is pushed at a steady speed 20 m up a slope, by a force of 50 N acting in the same direction that the object moves. At the end of this distance, the trolley is 1.5 m higher than at the start. Calculate the gain of potential energy of the trolley.

A luggage trolley of total weight 400 N is pushed at a steady speed 20 m up a slope, by a force of 50 N acting in the same direction that the object moves. At the end of this distance, the trolley is 1.5 m higher than at the start. Use your last two answers to calculate the energy wasted due to friction.

A spring that obeys Hooke's Law requires a force of 1.2 N to extend it to an extension of 50 mm. Calculate the force needed to extend it to an extension of 100 mm.

Calculate the work done with this spring is stretched to an extension of 100 mm from zero extension.