Work
Take g as 9.8 ms-2 or 9.8 Nkg-1
How much work is done if you push a shopping trolley with a constant force of 60N and it moves 5m in a direction parallel to the force?
A delivery driver lifts a mass of 6.5kg onto the back of a lorry 1.5m from the ground. How much work is done in this energy transfer?
How much work is done lifting a 5kg bag 1.2m and place it on the table. In your calculation you assume all the work is done against what?
How much work is done pulling a bag of rubbish 10m across a field by pulling on a string at 400 to the horizontal with a force of 250N?
A toy car has a mass of 110g and its clockwork engine exerts a force of 0.12N. Unfortunately it is not well made and its wheels are at a 130 angle to its direction of motion. What work does it do in travelling 25cm along a heavily carpeted floor?
A pyramid builder is organising his gang of acolytes to pull a large stone block up a ramp. The stone weighs 2.5t and the ramp has a height of 7m. The ramp is 15m long and the acolytes exert a force of 1.2 kN. How much work to they do? How much work is done on the stone to lift it through a height of 7m? How much work is done against friction?
An 80kg baseball player slides to a halt from a speed of 8 ms-1 in a distance of 4m. What is the average stopping force exerted on him by the ground? How much work is done on him? Where does the energy come from?
A 50g ball bearing is dropped from a height of 50cm into a tray of fine sand and embeds itself to a depth of 1.5cm. What was the average vertical force exerted on the ball bearing by the sand? How much work is done on the ball bearing?
