Y11 INTERVENTION : Resultant force, braking, Mains

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Presentation transcript:

1. 2. 3. Y11 INTERVENTION : Resultant force, braking, Mains 5 mins EXAM CONDITIONS demand 1 Question (grade 4/5) 5 mins go through mark scheme 2. 10 mins Walking talking demand 2 Question (grade 6/7) 3. 5 mins EXAM CONDITIONS demand 3 Question (grade 8/9) 5 mins go through mark scheme

1. The force needed to accelerate the boat will be greater than 102 N because you have to overcome drag forces An equal and opposite force from the water pushes on the boat in the forward direction 1. 5 mins Acceln = change in velocity = time taken 16 - 4 = 12 8 8 Acceln = 1.5 m/s/s F = ma = 68 x 1.5 = 102 N

1. 2. 3. Y11 INTERVENTION : Resultant force, braking, Mains 5 mins EXAM CONDITIONS demand 1 Question (grade 4/5) 5 mins go through mark scheme 2. 10 mins Walking talking demand 2 Question (grade 6/7) 3. 5 mins EXAM CONDITIONS demand 3 Question (grade 8/9) 5 mins go through mark scheme

2. Distance car travels during the drivers reaction time Work done = Fs = 320,000 8000 N x s = 320,000 40 m Tiredness, alcohol, drugs, speed, age 2. 10 mins s = 320,000 = 8,000 Icy roads, worn tyres, road surface, mass of car, efficiency of brakes KE = 1 x mass x ( velocity )2 2 Work done by friction KE = 1 x 1600 x ( 20 )2 = 320,000 J 2 decreases the Kinetic energy and increases the thermal energy Work done = Fs = KE = 320,000J

1. 2. 3. Y11 INTERVENTION : Resultant force, braking, Mains 5 mins EXAM CONDITIONS demand 1 Question (grade 4/5) 5 mins go through mark scheme 2. 10 mins Walking talking demand 2 Question (grade 6/7) 3. 5 mins EXAM CONDITIONS demand 3 Question (grade 8/9) 5 mins go through mark scheme

3. 5 mins The max current is 26 A with all 4 hobs on full power. This exceeds the safe current for a thin cable of 2.5mm2. The cable will overheat. Current in one element = 26 / 4 = 6.5 A The cable has LIVE, NEUTRAL, EARTH The cable will have 6mm2 cross sec area V = I R V = R I 230 = R 6.5 35 ohms The cable will be insulated V = R I AC is constantly changing direction DC flows is one direction

1. 2. 3. Y11 INTERVENTION : Resultant force, braking, Mains 5 mins EXAM CONDITIONS demand 1 Question (grade 4/5) 5 mins go through mark scheme 2. 10 mins Walking talking demand 2 Question (grade 6/7) 3. 5 mins EXAM CONDITIONS demand 3 Question (grade 8/9) 5 mins go through mark scheme