To introduce F=ma Recap our test from before half term Carry out an experiment to investigate the relationship between acceleration and mass, acceleration and force Start solving problems involving F=ma

Recap our test

Linear air track experiment Investigate the relationship between acceleration and force Investigate the relationship between acceleration and mass Plot a graph Draw conclusions

From your graph you have found a ∝ F a ∝ 1 𝑚 Thus a ∝ 𝐹 𝑚 , and choosing an appropriate constant a= 𝐹 𝑚 , and F = ma. Resultant force = mass x acceleration

Key definitions Define resultant force Define the newton A resultant force is a single force which has the same effect as the sum of all the forces acting on a body Define the newton 1 newton is the force required to accelerate an object of mass 1kg by 1ms-2

Weight Weight in N = mass x acceleration due to gravity Weight = mg

Example A go kart has a rocket attached to it of mass 78kg (with driver). The go kart is travelling at a constant speed of 4ms-1, at which point the rocket fires and the go kart experiences a driving force of 450N and drag forces of 280N. Calculate The resultant force acting on the go-kart The acceleration of the go-kart The final speed of the go-kart if it continues to accelerate at this rate for 5 seconds

You try Questions from the sheet

Homework Make notes on the types of force from page 51 of your text book ready for the lesson tomorrow, include a diagram.