Force and pressure Worksheet-7

Force and pressure Worksheet-7

 

  1. What is force?

 

  1. What is the requirement for a force to come into play?

 

  1. What is the resultant force when two forces act in same direction?

 

  1. What will be the resultant force when two forces act in opposite directions on an object?

 

  1. What happens in tug of war when two teams pull equally hard?

 

  1. Name the term used to express the strength of a force.

 

  1. When does the net force become zero?

 

  1. A ball is in rest. Push it gently. Does the ball begin to move?

 

  1. What happens when we push again while the ball is moving?

 

  1. Place you palm in front of the moving ball. Does your palm apply any force on the ball?

 

  1. What happens to the speed of the ball when you place your palm is front of the moving ball?

 

  1. What are the two states of motion?

 

  1. Does the application of a force would always result in the change in the state of motion of an object?

 

  1. What is muscular force?

 

  1. Give two examples of muscular force.

 

  1. Does the force can change the speed of a moving object?

 

  1. What effect does a force put on the shape of an object?

 

  1. Is muscular force a type of contact force?

 

  1. What is force of friction?

 

  1. What kind of force is friction?

 

  1. Why does force of friction called contact force?

 

  1. Give two examples of contact forces.

 

  1. What are non-contact forces?

 

  1. Give an example of non-contact force.

 

  1. What is magnetic force?

 

  1. What is the interaction of poles of two magnets?

 

  1. What do you mean by electrostatic force?

 

  1. What kind of electrostatic force?

 

  1. What is gravitational force?

 

  1. Is the gravity a property of earth only?

 

Answer:

  1. A push or a pull

 

  1. Interaction between two objects.

 

  1. They are added and the resultant force is more than the individual force.

 

  1. When two forces act in opposite directions on an object then the net force will be the difference between two forces and if magnitude of both the forces is same then the resultant force will be zero.

 

  1. When two teams pull equally hard then the rope does not move in any direction. If magnitude of both the forces is same then the resultant force will be zero.

 

  1. Magnitude.

 

  1. When two forces acting on an object in opposite directions are equal then the net force becomes zero.

 

  1. Yes

 

  1. Its speed increases.

 

  1. Yes

 

  1. The speed of the ball is decreased.

 

  1. There are two states of motion:

(i)The state of rest, (ii) The state of motion.

 

  1. No.

 

  1. The force resulting due to the action of muscles

 

  1. Bending of our body and kicking the ball.

 

  1. Yes.

 

  1. The force which comes in action when objects are in contact is called contact force.

 

  1. Yes

 

  1. The force acts on all moving objects in opposite directions of the motion of body is called force of friction.

 

  1. Contact force.

 

  1. Since the force of friction arises due to contact between surfaces of moving body and other Surfaces, so it is called contact force.

 

  1. (i) Muscular force, (ii) Force of friction

 

  1. The forces acting from a distance without making contact are called non-contact forces. For example gravitation forces.

 

  1. Magnetic force.

 

  1. The force exerted by a magnet on any magnetic object is called magnetic force.

 

  1. (i) Like poles repel each other.

(ii) Unlike poles attract each other.

 

  1. The force exerted by a charged body on another charged or non-charged body is called electrostatic force.

 

  1. It is non-contact force.

 

  1. The force by which earth or any other object attracts objects towards itself is called the gravitational force.

 

  1. No