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Year 10 Science Name_____________________________________ Newton’s Laws of Motion 1. Which force prevents a bus falling through the road? 2. List two forces that act against the forward motion of a car. 3. Describe your motion (as a passenger on a bus) if the bus... a) Does a quick right turn? b) A slow left turn? c) An emergency stop at 60 km/hr? 4. The gravity on Mars is only 3.7 m/s2. What would your weight be on Mars? 5. Explain in terms of Newton’s First law of Motion why you should wear a seat belt in a vehicle. 6. What total force would cause a 1.5 kg glass bowl to accelerate across a table at 0.2 m/s2? 7. List 3 pairs of action and reaction forces. 8. Who invented the first rockets and what were they used for? Using Newton’s Second Law of Motion Name_________________ 1. How much horizontal net force is required to accelerate a 1000 kg car at 2 m/s2? (N) Solution: 2. What total force would cause a 1.5kg salad bowl to accelerate across the table at 0.30 m/s2? (N) Solution: 3. A net force of 10 Newtons acts on a box which has a mass of 2 kg. What will be the acceleration of the box? (m/s2) Solution: 4. A jet airplane accelerates on the runway at 3.0 m/s2. It has two engines which exert a total thrust of 3.0 x 105 N. What is the mass of this airplane? (tonnes) Solution: 5. A 10 kg sled is pulled across the snow so that the total force acting on it is 12 N. What is the size of the acceleration of the sled? (m/s2 ) Solution: 6. Two identical toy carts A and B each with a mass of 1.0 kg are pushed across a smooth level table with the same force. One of them carries a heavy brick. Cart A accelerates more rapidly than Cart B. Solution: a) Which toy cart contains the brick? How do you know? b) If the acceleration of Cart A is 2.0 m/s2 what is the total force acting on each cart?