3914312
| Pregunta | Respuesta |
| P2.1 Forces can change the shape of an object. True or false? | True- they can change the shape and the motion. |
| P2.1 What happens when two objects interact? | The forces they exert on each other are equal and opposite. |
| P2.1 Name the force that sums up all forces acting on an object. | The resultant force. |
| P2.1 If the resultant force on an object is 0, what will happen to it? | It will remain stationary or stay at a constant speed (terminal velocity). |
| P2.1 If the resultant force on an object is not 0, what will happen to it? | It will accelerate in the direction of the resultant force. |
| P2.1 What are the two equations for acceleration? | a=f/m OR a=(v-u)/t |
| P2.1 What does the gradient of a distance-time graph represent? | speed. |
| P2.1 What does the gradient of a velocity-time graph represent? | Acceleration. |
| P2.1 As the speed of a vehicle increases, what will happen to the breaking force needed? | It will be higher. |
| P2.1 What is the stopping distance of a vehicle? | The sum of the thinking distance and the braking distance. |
| P2.1 Name two factors that can affect a driver's reaction time. | -alcohol influence -drug influence -tiredness |
| P2.1 Name two factors that can affect a vehicle's breaking distance | -adverse road -poor weather conditions -poor condition of the vehicle (worn tires, etc) |
| P2.1 The faster an object moves through a fluid, what happens to the frictional force acting on it? | It will increase. |
| P2.1 Describe fully the motion of an object falling through fluid. | It will accelerate at first as gravity is the stronger force, but then it will reach a terminal velocity as the resultant force becomes zero. |
| P2.1 What is the equation for the weight (in Newtons) of an object? | W=mxg |
| P2.1 What happens when a force is applied to an elastic object? | It will stretch and store elastic potential energy. |
| P2.1 Name the point where extension and force stop being directly proportional. | The limit of proportionality. |
| P2.2 What happens when a force causes an object to move through a distance? | Work is done. |
| P2.2 Which equation relates work done, force and distance? | W=Fxd |
| P2.2 What actually happens when work is done? | Energy is transferred. |
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