Question

3. Answer the following questions.
(a) Define force. List three effects of force,
(b) Define work.
(c) Mention any four types of force.
(d) What would happen if Earth had no gravity?
(e) Give some examples of simple machines.
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Answer 1

Answer:

A- 1.force can change the shape of an object

2.it can change the direction of an moving object

3.it can either increase or decrease the speed of an object

B.

C. Gravitational force, electrostatic force, magnetic force, muscular force

D.

E.

Answer 2

Answer:

(a):Define force. List three effects of force?

Ans: A force is a push or pull upon an object resulting from the object's                                  interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects.

    A force can move a stationary object.

   A force can stop a moving object.

   A force can change the speed of a moving object.

   A force can change the direction of a moving object.

   A force can change the shape and size of an object.

(b): Define Work?

Ans: In physics, work is defined as a force causing the movement—or displacement—of an object. In the case of a constant force, work is the scalar product of the force acting on an object and the displacement caused by that force.

(c):Mention any four types of force?

Ans: Applied Force.

   Gravitational Force.

   Normal Force.

   Frictional Force.

   Air Resistance Force.

   Tension Force.

   Spring Force.

(d):What would happen if Earth had no gravity?

Ans: A lack of gravity would eventually take its toll on our very planet, writes Masters. "Earth itself would most likely break apart into chunks and float off into space." ... Without the force of gravity to hold it together, the intense pressures at its core would cause it to burst open in a titanic explosion.

(e):Give some examples of simple machines?

Ans: Machine.

   Screw.

   Wheel and axle.

   Lever.

   Pulley.

   Inclined plane.

   Wedge.