2512853
Description
Flashcards by Ben Goetze, updated more than 1 year ago
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Created by Ben Goetze
almost 10 years ago
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| Question | Answer |
| For a projectile (in absence of air resistance) | Horizontal Component of Velocity is constant Acceleration is in the vertical direction and is the same as that of a vertically free-falling object |
| The time of flight of a projectile is determined by | The change in vertical component of velocity and the acceleration |
| The range of a projectile is calculated by | multiplying the horizontal component of velocity and the time of flight. |
| The maximum height of a projectile can be calculated from | The vertical component of the initial velocity and the acceleration or the time of flight and the acceleration |
| Air Resistance | A resistive force that acts in the opposite direction to the velocity of a projectile at any instant |
| The magnitude of the force of air resistance on an object depends on | shape, size, speed and the surface texture and the density of the air |
| The velocity of an object moving with uniform circular motion | continually changes direction and hence accelerates. (The speed remains constant) |
| The direction of the acceleration of an object undergoing UCM | is towards the centre of the circle (centripetal) |
| When a vehicle travels round a banked curve at the correct speed for the banking angle, the centripetal acceleration is caused by: | The horizontal component of the normal force on the vehicle (not the frictional force on the tyres) |
| Newtons Law of Universal Gravitation | Any two particles experience mutually attractive gravitational forces along the line joining them. The magnitude of these forces is directly proportional to the product o the masses and inversely proportional to the square of the distance between them. |
| The centres of circular orbits of Earth satellites must coincide with the centre of the Earth because: | For uniform circular motion to occur the only force acting should be a force inward (or down). If the centre of the circle does not coincide with the centre of the Earth, there will be a sideways component of the force acting, and so UCM cannot occur. |
| Law of Conservation of Momentum | In an isolated system (one where no unbalanced external forces act) the total momentum of the system remains the same regardless of any interactions between objects. |
| Impulse | The change in momentum |
| Newtons Second Law in terms of momentum | The net force is the rate of change of momentum with time. |
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