7 Grade Science ppt on a basic topic Added transitions and animations

1. FORCES AND THEIR
EFFECTS
By: Muhammad Ibrahim Akmal
Class: 7th-Orange
Date: 1st February, 2018

2. WHAT IS A FORCE?
 A force is a push or pull.
 The size of force is measured in
Newtons (N).
 Forces always act in opposite pairs.
 There are two types of forces;
• Contact forces
• Non-contact

3. MEASURING FORCES
Newton (N) is the SI unit (International System of units) of
force.
The size of force is measured in newton (N).
1 Newton = 100 grams.
Forces can be measured using forcemeters or spring
balences.

4. FORCEMETERS AND SPRING
BALENCES

5. IN OPPOSITE PAIRS?
Forces always act in opposite direction in a pair.

7. GRAVITATIONAL FORCE
 Gravitational force or gravity is the between two masses
force of attraction like magnetic force it is non-contact force.
 It always pull objects to the center of the earth.
 This force is observed easily between large masses

8. WEIGHT VS. MASS
The weight of an object Is the gravitational force acting on the
object.
An object on Earth has weight because of the gravitational force
between the object and the Earth.
SI unit of Force is Newton (N).
Whereas, Mass is the amount of matter in an object.
This means that the mass will remain the same but weight will
change according to gravitational force.
SI unit of mass is Kilogram (Kg).