Flashcards
P2.2 Flashcards
Flashcards do conjunto (27)
- 1What is the SI unit of force?Newton, N
- 2In what direction does the force of weight always act?Downwards (or towards (the centre of) the Earth)
- 3What is the unit of resultant force?Newton, N
- 4What is the resultant force of a 4N force and a 3N force acting in the same direction?7N in the same direction as the two forces
- 5What happens to the acceleration of an object as the resultant force on it decreases?Acceleration decreases
- 6What is the resultant force on a car of mass 1000kg if its acceleration is 2m/s2?2000N
- 7What is the resultant force on a car travelling at a steady speed on a straight horizontal road?Zero
- 8What is the relationship between stopping distance, thinking distance and braking distance?Stopping distance = thinking distance + braking distance
- 9Why does an object dropped in a fluid initially accelerate?There is a resultant force acting on it
- 10What eventually happens to an object falling in a fluid?It will reach a terminal velocity because the resultant force becomes zero
- 11What is an inelastic object?An inelastic object is one that does not regain its original shape when the forces deforming it are removed
- 12A spring has a spring constant of 30 N/m. If the extension is 0.30m, what is the force applied?9N
- 13How can we tell when a spring has exceeded its limit of proportionality?The graph of extension against force applied is no longer a straight line
- 14Why does making a vehicle more streamlined improve fuel economy?Less engine and less power are needed to maintain a certain speed. Less fuel is needed so fuel costs are reduced
- 15When a vehicle is travelling along a straight road at a steady speed what can you say about the engine force and the air resistance?The vehicle is not accelerating, so the resultant force on it is zero. So the engine force and air resistance are balanced
- 16If you push on a wall with a horizontal force of 15N to the right, what force will the wall exert on you?15N to the left
- 17What happens to an object moving at a steady speed if the resultant force on it is zero?The object continues to move at a steady speed in the same direction
- 18When will a resultant force cause a deceleration?When the force is in the opposite direction to the motion
- 19What happens to the acceleration of an object as the resultant force on it increases?The acceleration increases
- 20What is the resultant force on a car of mass 1500 kg if its acceleration is 0.5m/s2?750N
- 21What is the acceleration of a car of mass 2000kg if the resultant force acting in its direction of motion is 800N?0.4m/s2
- 22What is the effect of the speed of a vehicle on its stopping distance?The faster the speed the greater the stopping distance
- 23What is terminal velocity?The final steady speed of an object falling freely through a fluid
- 24What is the weight of a person of mass 70kg?700N
- 25What is an elastic object?One that goes back to its original size and shape when the force applied to it is removed
- 26What does Hooke's law state?The extension is directly proportional to the force applied, provided the limit of proportionality is not exceeded
- 27When a force of 10N is applied to a string it extends by 2.0cm. What is the spring constant of the spring?500N/m
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- GCSE Physics (Unit 2) FlashCards sobre P2.2 Flashcards, criado por Mel Hughes em 26-08-2016.
- Criado por
- Mel Hughes
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