Science year 6 FORCE

Created by
Nishant a/l Ravinderan

6 KAMBAR
SJK(T) RAMAKRISHNA

FORCE

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.
When the interaction ceases, the two objects no longer experience the force. Forces only exist
as a result of an interaction.

Concepts related to force include: thrust, which increases the velocity of an object; drag, which
decreases the velocity of an object; and torque, which produces changes in rotational speed of
an object.

Pressure, the distribution of many small forces applied over an area of a body, is a simple type
of stress that if unbalanced can cause the body to accelerate. Stress usually
causes deformation of solid materials, or flow in fluids.

PG 2

Force

 What is force
 Effects of forces
 Frictional force
 Effects of fictional

force

PG 3

PUSH FORCE PULL FORCE

MEANS IS THE FORCE THAT MEANS THE FORCE THAT
MOVES THE OBJECT AWAY MOVES THE OBJECT CLOSER

FROM US TO US

 Pushing a car that has been stalled.  PULLING A SLINGSHOT
 Pushing a lawn mower  PULLING A FISHING LINE
 Pushing a cart  PULLING A ROPE
 Pushing furniture
PG 4

Effects of Force

Force acting on an object causes the object to
change its shape or size, to start moving, to stop
moving, to accelerate or decelerate. When there's the
interaction between two objects they exert a force on
each other, these exerted forces are equal in size but
opposite in direction.

PG 5

Examples

Pressing a record or other object made by the
application of force or weight.

Bending force or be forced to submit.

A Frictional force is the force generated when two surfaces
are in contact. A Frictional force can also cause a moving
object Frictional to slow down and finally stop. A moving
ball is stopped by a hockey stick.

PG 6

The frictional force can also
prevent a resting object from
moving. For example, the
frictional force between the
surface of sofa and the
surface of the carpet makes
it difficult for the sofa to be
pushed.

PG 7

Direction of the movement of object The direction of the
frictional force is always
Direction of fictional opposite to the direction
force of the movement of the

object

PG 8

PULL FORCE PUSH

EFFECT OF A FORCE

CHANGES THE CHANGES CHANGES THE STOPS A MOVED A
SHAPE OF AN THE SPEED OF AN MOVING STATIONARY
OBJECT
OBJECT DIRECTION OF OBJECT OBJECT
MOTION OF
AN OBJECT

ADVANTAGES OF FRICTIONAL FORCE DISADVATAGES OF FRICTIONAL FORCE

 Produces Heat  Produces unwanted noise
 Slows down a moving object and stops it  Makes movement difficult
 Holds an object  causes the soles of shoes and tyres of
 Makes an object stay static
 Sharpens tools vehicles to be worn out

PG 9

FRICTIONAL FORCE

WAYS TO INCREASE AFFECTING FACTORS WAYS TO REDUCE
FRICTIONAL FORCE FRICTIONAL FORCE
 type of surface
 Use patterned  Mass of object  Use lubricants
soles and  Use grease
surfaces  Use rollers

 Make the surface &ball bearing
rougher  Use wax
 Use boric acid
 Use anti-slip
mats powder

 Use magnesium PG10
carbonate chalk
powder