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Definition
| Some combination of the base units. The base units may be multiplied together or divided by one another, but never added or subtracted. |
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Definition
| When each term has the same base units, the equation is said to be homogeneous or 'balanced'. |
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| How close a reading is to its true value. When readings are accurate, the peak / average value moves towards the true value. |
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Definition
| Smallest change in value that can be measured by an instrument. OR Spread of values / measurements (scatter between each data is relatively small / lines are closer together / sharper peak). |
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Definition
| Readings have positive and negative values around the peak value / values are scattered / wide range. To reduce errors, take several readings to get an average value. |
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Definition
| The average / peak is not the true value / the readings are not centred around the true value. Look/check for zero error to avoid systematic error. |
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Term
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Definition
| The range of value within which a measurement is likely to be in. |
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Definition
| A quantity that has magnitude/size. |
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| A quantity that has magnitude/size and direction. |
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Definition
| Rate of change of velocity. |
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Definition
| The straight line distance between start and finish points (in that direction) / minimum distance. |
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Term
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Definition
| The actual path travelled. |
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Term
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Definition
| Distance travelled per unit time taken. |
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Definition
| Rate of change of displacement. |
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Definition
| The downward motion of an object under the influence of force of gravity with a constant acceleration (g = 9.81 ms⁻²). |
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Term
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Definition
| Effect due to a resistive / drag force that opposes the direction of motion. This drag force will affect acceleration of object. |
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Term
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Definition
| A type of resistive force that is proportional to speed of the object, and opposes direction of motion. Drag due to friction of object with air particles can cause kinetic energy to be dissipated as heat. |
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Term
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Definition
| Objects acted upon by a force with vector at perpendicular to its horizontal velocity. Assume zero frictional forces. Trajectory of the object will result in a parabola. |
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Definition
| Constant speed of object when resultant force is zero due to large air resistance. |
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Term
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Definition
| Rate of change of momentum. |
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Term
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Definition
| A measure of inertia of a body, or the property of a body that resists change in motion. |
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Term
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Definition
| A body remains at rest or constant velocity unless acted on by a resultant (external) force. |
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Term
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Definition
| The (resultant) force is proportional to the rate of change of momentum. |
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Term
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Definition
| If one body exerts a force on another, it will experience a force by the other body, which is equal in magnitude & opposite in direction. Both forces are of the same kind. |
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Term
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Definition
| Total momentum of (an isolated) system (of interacting bodies) remains constant, provided there are no resultant external forces (e.g. friction). |
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Term
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Definition
| Total momentum and total Kinetic Energy of a system is conserved. Relative speed of approach is equal to the relative speed of separation. |
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Term
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Definition
| The product of a force & the time during which the force is applied. |
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Definition
| Total momentum of a system is conserved, but the total Kinetic Energy is not conserved. Speed before impact is not equal to speed after. |
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Definition
| Product of an object's mass & velocity, with its direction always being the same as the direction of velocity. |
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Term
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Definition
| The gravitational force on a mass due to the gravitational field (W = mg). |
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