P2.1.2 |
Forces and motion |
a) The acceleration of an object is determined by the resultant force acting on the object and the mass of the object.
a = F/m
F = m x a |
F is the resultant force in newtons, N
m is the mass in kilograms, kg
a is the acceleration in metres per second squared, m/s2
This is Newton's Second Law of Motion |
b) The gradient of a distance–time graph represents speed. |
Candidates should be able to construct distance–time graphs for an object moving in a straight line when the body is stationary or moving with a constant speed. |
c) Calculation of the speed of an object from the gradient of a distance–time graph. |
- gradient of the graph |
d) The velocity of an object is its speed in a given direction. |
Velocity is the vector version of speed. |
e) The acceleration of an object is given by the equation:
|
a is the acceleration in metres per second squared, m/s2
v is the final velocity in metres per second, m/s
u is the initial velocity in metres per second, m/s
t is the time taken in seconds, s |
| f) The gradient of a velocity–time graph represents acceleration. |
|
| g) Calculation of the acceleration of an object from the gradient of a velocity–time graph. |
- gradient of the graph |
| h) Calculation of the distance travelled by an object from a velocity–time graph. |
- area under the graph line. |
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