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A level Physic 3.1
Mechanics Facts
| Question | Answer |
|---|---|
| What quantity can be calculated from the gradient of a velocity time graph? | Acceleration |
| What quantity can be calculated from the area under a velocity time graph? | Displacement |
| What are the 4 equations of uniform motion? | v = u + at s = ut + ½ at2 s = ½ (u+v)t v2= u2+ 2as |
| Which equation of uniform motion can be derived from the gradient of a velocity time graph? | v = u + at |
| What equation of uniform motion can be derived from the area under a velocity time graph? | s = ut + ½ at2 |
| What does the term acceleration of free fall refer to? | The only force causing the motion is gravity, so the acceleration is g |
| In projectile motion what can you state about the horizontal motion? | The horizontal velocity is constant |
| In projectile motion what equations govern the vertical motion | The 4 equations of uniform motion |
| Describe the motion of a horizontal projectile. | The horizontal velocity is constant throughout the journey. The vertical velocity increases due to the acceleration of gravity |
| Describe and explain the values of the vertical and horizontal velocities when a ball is kicked at its greatest height. | Vertical velocity = 0 Object momentarily at rest as it changes direction due to being decelerated by gravity. Horizontal velocity same as initial, as there is no force action in this plane |
| Define stopping distance | stopping distance= thinking distance+ braking distance |
| Define thinking distance | The distance travelled (by the car) from when the driver sees a problem and the brakes are applied |
| Define braking distance | The distance travelled by the car after the brakes are applied until the car stops |
| What is the relationship between thinking distance and speed? | Thing distance = speed x reaction time Thinking distance is directly proportional to speed |
| What is the equation for the work done by the brakes? | Work done = braking force x braking distance |
| What type of energy does a car have before braking? | Kinetic energy |
| What is the conservation of energy equation for a car braking? | Kinetic energy lost by car = work done by brakes |
| What is the relationship between braking distance and initial speed? | Braking distance is proportional to the speed squared? |
| How does a light gate work calculate velocity? | The value of the length of the card is inputted. The light gate measures the time for the light gate to be interrupted. The software then calculates the velocity from = length of card/ interrupt time |
| Define acceleration | Acceleration is the rate of change of velocity |
| Define instantaneous velocity | The speed of an object at a given moment of time |
| Define displacement | The distance travelled in a particular direction |
| Define average speed | The rate of change of distance |
| Define velocity | Rate of change of displacement |
| Which equation of uniform motion comes from the definition of average velocity | s/t = ½ (u+v) |
| What does uniform motion mean | constant acceleration |
| How do you calculate speed from a curved distance time graph? | Draw a tangent to the curve and then calculate the gradient of the curve |
| How would a deceleration appear on a velocity time graph? | Negative gradient |
| If an object is moving with a constant velocity, what would be the gradient of a velocity time graph be at this point? | Zero, as acceleration is zero. |
| Which suvat quantity links horizontal and vertical motion | time is the same for both motions |
| How is the final velocity calculated from the horizontal and vertical velocities | Using pythagrous for magnitude and tan for angle, |
Created by:
Davenant Foundation Physics