Force and pressure Worksheet-14

Force and pressure Worksheet-14

 

  1. Force of friction is an example of non-contact force.

 

  1. If two forces act in opposite directions on an object, the net force is the difference between the two forces.

 

  1. The forces of friction can be reduced by using lubricants.

 

  1. The force exerted per unit area is called magnitude.

 

  1. A force can change the state of motion of an object.

 

  1. A push or pull on an object is called force.

 

  1. In order to stop any moving body one has to apply force in same direction of the motion of the moving body.

 

  1. Forces that do not need physical contact are non contact forces.

 

  1. Friction is a type of non contact force.

 

  1. The force with which objects pull each other is gravitational force.

 

  1. Gravitational force applied by smaller objects is higher as compared to massive objects.

 

  1. In electric air purifiers dust and smoke gets attracted due to electrostatic force.

 

  1. Magnetic force can attract nickel.

 

  1. SI unit of force is pascal.

 

  1. The branch of science which deals with the study of friction is tribology.

 

  1. The forces used with our hands, legs, etc. are collectively called applied forces.

 

  1. Friction is the resistance to motion experienced when two surfaces in contact move with respect to each other.

 

  1. Force is a push, but not a pull on an object.

 

  1. The weight of an object is because of the Earth’s electrostatic force.

 

  1. The Earth’s gravitational force keeps us bound to Earth.

 

Answer:

  1. False

 

  1. True

 

  1. True

 

  1. False

 

  1. True

 

  1. True

 

  1. False

Explanation: In order to stop any moving body one has to apply force in opposite direction to the motion of body.

 

  1. True

 

  1. False

Explanation: Friction is a type of contact force.

 

  1. True

 

  1. False

Explanation: Gravitational force applied by massive objects is higher as compared to smaller objects.

 

  1. True

 

  1. True

 

  1. False

Explanation: SI unit of force is Newton.

 

  1. True

 

  1. True

 

  1. True

 

  1. False

Explanation: Force is a push or pull on an object.

 

  1. False

Explanation: The weight of an object is because of the Earth’s gravitational force.

 

  1. True