1. Open up your notes at page 15, note 24, Newton’s Laws and Space Travel. Work in pairs - Attempt to fill in the blank space in note 24. weight W = ? m = 2000 kg g = 9.8 N/kg W = mg = 2000 x 9.8 = 19600 N

2. Fu = thrust – weight = 32000 – 19600 = 12400 N Fu = 12400 N m = 2000 kg a = ? a = Fu m = 12400 2000 = 6.2 ms -2

3. Fu = 8000 N m = 2000 kg a = ? a = Fu m = 8000 2000 = 4 ms -2

4. v = ? u = 0 ms -1 a = 4 ms -2 t = 3 s v = u+at = 0 + (4x3) = 12 ms -1 The probe will be travelling at a constant speed of 12 ms -1. An object (the probe) will travel at a constant speed unless acted on by an unbalanced force.

5. Continue with the problems on page 35 to 39