Force , mass and acceleration & springs

What is the force required to produce an acceleration 0.3m/s^2 on an object of weight 10 N.

• 0.3 N

• 3 N

• 10 N

• 2 N

What happens when force applied on object is doubled?

• Acceleration remains constant

• Velocity doubles

• Acceleration becomes half

• Acceleration doubles

What happens when load on a spring is made three times provided it does exceed the elastic limit of the spring?

• Length of the spring doubles

• Length of the spring becomes three times

• Extension of the spring becomes three times

• No change

If a load of 10 N produces an extension of 2cm, what load is needed to produce an extension of 8cm provided the load is in the elastic limit of the spring

• 5N

• 40 N

• 8N

• 20 N

A weight of 12 N is supported by 2 springs in series, with spring constant 15 N/m and 60 N/m respectively. How far will the spring extend?

• 2m

• 1m

• 1.5m

• 3m

A weight of 30 N is supported by 2 springs in parallel, with spring constant 20 N/m and 40 N/m respectively. What is the extension of the spring system?

• 2m

• 0.5m

• 8m

• 1.5m

What happens when an aircraft is overloaded?

• Increased acceleration

• No effect on acceleration

• Reduced acceleration requiring longer take off run