[2](a)A resultant force of 3000 N acts on a car of mass 1200 kg. Calculate the acceleration produced.

[2](b)State Newton's Third Law of Motion.

[2](a)A spring has a spring constant of 250 N/m. Calculate the force needed to extend it by 6.0 cm.

[2](b)State Hooke's Law and give the condition under which it applies.

[2](a)A box of weight 400 N rests on a horizontal floor. Draw and label the two vertical forces acting on the box (describe them).

[2](b)State the size of the normal contact force from the floor on the box, and explain your reasoning using Newton's First Law.

[3](a)Explain, in terms of forces, why a skydiver eventually reaches a constant (terminal) velocity while falling.

[2](a)A resultant force of 500 N acts on an object of mass 250 kg. Calculate its acceleration.

[2](a)A spring extends 4.0 cm when a force of 20 N is applied. Calculate the spring constant, in N/m.

[2](a)Two forces, 30 N and 40 N, act at right angles to each other on an object. Calculate the resultant force.

[2](a)A 500 N crate sits on a ramp inclined at 30° to the horizontal. Calculate the component of its weight acting down the slope.

[2](a)A resultant force of 150 N gives an object an acceleration of 3 m/s². Calculate the mass of the object.

[1](a)State what is meant by 'equilibrium' for an object acted on by several forces.

[2](a)Explain why a coffee cup on a stationary table does not accelerate, using Newton's laws.