In maths, we have been focusing on Kinematics. This week we have lean about Acceleration, Newton's 3 Laws and Mass and Weight.
Acceleration
The following equation links the acceleration of an object, it's change in speed and the time taken.
The following equation links the acceleration of an object, it's change in speed and the time taken.
The formula that is used to find the acceleration is;
a=Δv ➗ t
Eg. A runner accelerates from 0m/s to 8m/s in 10s.
a=Δv ➗ t
= 8➗10
= 8➗10
= 0.8 m/s2
Newton's 3 Laws
- An object will either remain at rest or moving with constant speed if no unbalanced force acts on it.
- If an unbalanced force acts on an object it will accelerate.
- Every action has an equal and opposite reaction.
Mass and Weight
An object's mass and its weight are two different things. Mass is the amount of matter in an object, measured in kg. We often (mistakenly) call this our weight. Weight is a force of gravity which acts on an object, measured in N.
Formula:
Fw = mg
Where: Fw is the weight force of an object (in N)
m is the mass of the object (in kg)
g is the acceleration due to gravity (10 m/s2)
Eg. A car with mass 1500kg accelerates at 7m/s2.
F= ma
= 1500 x 7
= 10 500N
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