3688366
Description
Flashcards by Adham Rataba, updated more than 1 year ago
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Created by Adham Rataba
about 10 years ago
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| Question | Answer |
| Force | A push or pull experienced by an object when it interacts with another |
| Interaction | What happens when two objects collide or influence each other at a distance |
| Interaction pair | Two forces that arise from the same interaction (equal size- opposite direction) |
| Contact forces | Forces that arise from two objects touching |
| Friction | The force exerted on an object due to the interaction between it and another object it is sliding over. Caused by roughness of both surfaces at a microscopic level |
| Resultant force | The sum of all the forces acting on an object (taking direction into account) |
| Reaction of a surface | The force exerted by a hard surface on an object that presses on it |
| Air resistance | The force exerted on an object by the air when it moves through it |
| Distance | The length of the path along which an object has moved |
| Displacement | The length and direction of the straight line from the initial position of an object to its position at a later time |
| Average speed | The distance moved by an object divided by the time taken for this to happen |
| Instantaneous speed | The speed of an object at a particular instant |
| Velocity | The speed of an object in a given direction |
| Acceleration | The rate of change of an object’s velocity (its change of velocity per second) |
| Distance-time graph | A graph showing the distance an object has moved along its path at each moment during its journey |
| Slope | The slope of a graph is a measure of its steepness |
| Velocity-time graph | Way of summarising the motion of an object by showing its velocity at every instant during its journey |
| Momentum | A property of any moving object. Momentum = Mass x Velocity |
| Risk | The probability of an outcome that is seen as undesirable associated with some behaviour ot process |
| Driving force | The force pushing something forward |
| Counter-force | A force in the opposite direction to something’s motion |
| Work | Work is done whenever a force makes something move. Work = force x distance moved in the direction of the force. Equal to the amount of energy transferred |
| Gravitational potential energy | The energy stored when an object is raised to a higher point in the Earth’s gravitational field |
| Kinetic energy | The energy that something has owing to its motion |
| Conservation of energy | The total amount of energy at the end of any process is always equal to the total amount of energy at the beginning |
| What is speed? | Distance travelled in a certain time |
| What is the formula for speed (including the units)? | Speed (m/s) = Distance travelled (m) / Time taken (s) |
| What does this line represent in a Distance-Time Graph? | Constant speed |
| What does this line represent in a Distance-Time graph? | Stationary |
| What does this line represent in a Distance-Time graph? | Acceleration |
| What does this line represent in a Distance-Time Graph? | Constant speed in the other direction (returning to start) |
| How to calculate the speed from a distance-time graph? | Gradient = Change in x / Change in y |
| What does the gradient tell you in a Distance-Time graph? | Larger Gradient = Steeper Slope = Faster Speed Smaller Gradient = Gradual Slope = Slower speed |
| What is the only exception in Displacement -Time Graph that differentiate from a distance-time graph? | The gradient tells you the velocity |
| What is the difference between speed and velocity? | Speed is just a number, velocity tells you both the speed AND direciton |
| What is the formula for Acceleration (with units) ? | |
| What does the gradient tell you in a Velocity-Time Graph? | Steeper Gradient = Acceleration / Deceleration |
| What does this line represent in a Velocity-Time graph? | Acceleration |
| What does this line represent in a Velocity-Time Graph? | Constant speed |
| What does this line tell you in a velocity-time graph? | Increasing acceleration |
| What does this line tell you in a velocity-time graph? | Deceleration |
| What is the formula for Momentum? | |
| What is the formula for the Change in Momentum? | |
| 4 Car-Safety Features that reduce forces | Crumple zones, airbags, Seat-Belts, Cycle and Motorcycle Helmets, |
| What is the formula for the Work Done by a Force? | |
| What is the formula for Kinetic Energy? | |
| What is the formula for Gravitational Potential Energy? | |
| What is the formula that connects both KE and GPE? | KE gained = GPE lost |
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