4.17 use the relationship between power, work done (energy transferred) and time taken:
4.16 describe power as the rate of transfer of energy or the rate of doing work
power is the rate of transfer of energy, or the rate of work done. so p = E/t
4.12 know that work done is equal to energy transferred
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Work done = energy transferred |
4.11 know and use the relationship between work done, force and distance moved in the direction of the force: W = F × d
Work Done (J) = Force (N) x distance moved (m)
4.03 use the principle of conservation of energy
In any process energy is never created or destroyed. (It is just transferred from one store to another.)
1.21 describe the forces acting on falling objects (explain why falling objects reach a terminal velocity)
Initially the only force is weight as drag is proportional to velocity. So the object accelerates downwards. As it accelerates the velocity so the drag increases as well. meaning there is a smaller resultant force downwards so a smaller acceleration. Until the object reaches a speed where the drag is equal to the weight meaning there is no acceleration, this velocity is know as terminal velocity.
1.17 know and use the relationship between unbalanced force, mass and acceleration : F = M x A
Force = Mass x Acceleration.
the force refers to the resultant force or the combined forces as seen in 1.15
1.14 understand that force is a vector quantity
Force has a magnitude measured in (N) but it also has a direction, a push or a pull, up, down, left or right. So force is a vector.
1.13 understand how vector quantities differ from scalar quantities
scalars are quantities with only magnitude (size)
vectors are quantities with magnitude (size) and direction
1.12 identify different types of force such as gravitational or electrostatic
different types of forces include:
Gravitational, weight, friction, electrostatic, air resistance (drag), tension (force in a spring), up thrust, lift, thrust
1.11 describe the effects of forces between bodies such as changes in speed, shape or direction
Forces can act on a body to change the velocity, so the speed, direction or both.
Or forces can change the shape of a body, stretching it squishing it or twisting it.
1.01 use the following units: kilogram (kg), metre (m), metre/second (m/s), metre/second^2(m/s^2), newton (N), second (s) and newton/kilogram(N/kg)
Make sure you are familiar with units for
Mass: kilogram (kg)
Distance: metre (m)
Speed: metre per second (m/s)
Acceleration: metre per second squared (m/s^2)
Force: newton (N)
Time: second (s)
Gravity: newton/kilogram (N/kg)