Forces and Matter

Which force acts on an object when it is placed on a flat surface?

• a) Frictional force

• b) Tension force

• c) Gravitational force

• d) Electrostatic force

What happens to the spring constant when the spring is stretched?

• a) The spring constant remains the same

• b) The spring constant increases

• c) The spring constant decreases

• d) The spring constant becomes zero

What is the limit of proportionality?

• a) The maximum force that a spring can withstand without breaking

• b) The point at which the spring stops obeying Hooke's law

• c) The point at which the spring constant changes

• d) The point at which the spring reaches its maximum length

What is the SI unit of pressure?

• a) Newton

• b) Pascal

• c) Joule

• d) Watt

A force of 20 N is applied to an object with an area of 2 m2. What is the pressure exerted on the object?

• a) 10 Pa

• b) 20 Pa

• c) 40 Pa

• d) 60 Pa

When a force of 10 N is applied to an object, the object moves with a constant velocity. What can you say about the forces acting on the object?

• a) There is no net force acting on the object

• b) The object is accelerating

• c) The force is unbalanced

• d) The object is moving in a circular path

A spring has a spring constant of 5 N/m. What is the extension of the spring when a force of 20 N is applied to it?

• a) 4 m

• b) 5 m

• c) 10 m

• d) 25 m

Which of the following is not an application of pressure in everyday life?

• a) Using a nail to hang a picture on a wall

• b) Using a pen to write on paper

• c) Using a knife to cut vegetables

• d) Using a syringe to inject medicine

What is the pressure exerted by a force of 50 N on an area of 5 m2?

• a) 10 Pa

• b) 25 Pa

• c) 50 Pa

• d) 250 Pa

A spring has a spring constant of 100 N/m. What is the extension of the spring when a force of 20 N is applied to it?

• a) 0.2 m

• b) 0.5 m

• c) 2 m

• d) 5 m