1. a) Define vector and scalar quantities.
b) Classify the following quantiles into two groups, scalars and vectors. Momentum distance time velocity acceleration power force and energy.
2. Using Newton’s Laws of motion and given the information below answer the following questions:
a) A shuttle is launched into space The shuttle produces a lift force of approximately 10,000N. The resistive force on it is 7,000N. Draw a diagram to represent this.
b) Once the shuttle has escaped the atmosphere, it jettisons its rockets. Explain why the shuttle will carry on moving with a constant velocity at this stage, even though it is no longer generating any force.
Explain how you reach your answer and which of Newton’s Laws you use.
3. a) Identify and define K.E. and G.P.E and explain the conservation of energy
b) Which of the following has more kinetic energy:
A car of mass 500 kg moving at 15 m s-1 or a motorcycle of mass 250 kg moving at 30 m s-1? Show the calculations you used to answer the question.
c) What is the potential energy of a 10kg mass:
i) 100m above the surface of the earth? ii) 300m above the surface of the earth?
d) A constant force of 2kN pulls a crate along a level floor a distance of 10m in 50s. What is the power used?
e) If a 2Kg mass is held 10m above the ground. What is the potential energy? If the 2Kg mass is dropped, what is the velocity of the mass just before it hits the ground?
