IGCSE Physics: Work – Numerical Practice Problems

Practice Problems:
1.  Calculate the amount of work done when moving a 567N crate a distance of 20 meters.
2.  A fallen tree is lifted 2.75 meters.  How much work is done?
3.  If it took a bulldozer 567.6 joules of work to push a mound of dirt 30.5 meters, how much force did the bulldozer have to apply?
4.  A frontend loader needed to apply 137 newtons of force to lift a rock.  A total of 223 joules of work was done.  How far was the rock lifted?
5.  A young boy applied a force of 2,550 newtons on his St. Bernard dog who is sitting on the boy’s tennis shoes.  He was unable to move the dog.  How much work did he do trying to push the dog?
6.  If it takes 68 joules of work to push a desk chair across a floor, what force would be needed?
7.  If a long distance runner with a weight of 596.82 newtons does 35,674.7 joules of work during a portion of a race, what distance will she cover during that portion?
8.  If a weight lifter raises a barbell with a mass of 125.7 grams doing 5,023 joules of work, what distance did he move the barbells?   Remember that you need a force, not a mass.  You must first calculate the force in order to complete your solution. HINT: Weight is a force.  Weight on earth is determined by multiplying an object’s mass times earth’s gravitational pull (9.8m/s2   ).
9.  Children are sled riding on a hill.  One little girl pulls her sled back up the hill and does 379.5 joules of work while pulling it back up the 17.3 meter hill.  What amount of force did she exert on the sled?
10.  A large semi-truck is moving a house from one lot to another. The amount of force required to move the house horizontally a distance of 73.2 meters is 3,500 newtons. How much work will be done on the house?