Repetion exercises I
1) List five different types of energy.
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2) Give three different examples of energy transformations.
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3) State the golden rule of mechanics. For which machines does it apply?
4) State the formula that describes levers and make a drawing, showing the quantities that enter the equation.
5) State the formulas that describe pulleys and explain them with words.
6) State the formula that describes inclined planes and make a drawing, showing the quantities that enter the equation.
7) Jasper has a mass of 55 kg. What is the gravitational force that acts on him?
Repetion exercises II
1) An eagle is flying 500 m above the ground. It has a mass of 4200 g.
a) Calculate the potential energy (Lageenergie) of the bird relative to the ground.
b) The eagle is flying with 50.4 km/h. Show that this amounts to 14 m/s.
c) Calculate the kinetic energy (Bewegungsenergie) of the eagle.
2) You have a kettle to boil water. It uses 3000 J per second but only 1000 are used to heat the water. The rest is wasted.
a) Calculate the efficiency of the kettle.
b) Calculate the amount of energy that is wasted every hour.
3) You pull your sled 200 m, using a force of 60 N. Calculate the Work done on the sled.
4) Fill out the table writing the missing quantities, symbols and units. Use standard (SI) units – for instance, the standard unit of mass is kg and not g.
Quantity (Größe) Symbol Standard unit (Einheit) Mass
Length Time Energy
Power Force
