types of forces

• Science
• Secondary Education

SCIENCE 

GRADE-9 OCT 4, 2020

Grade-9

OCT 4, 2020

INSTRUCTIONS 

Keep the mic muted do not on unless instructed

 Turn on your camera

Raise your hands while talking 

write names in chat section 

Maintain the online class decorum 

What do you already know about force?

Objectives

Describe force

Analyse different  types of forces 

Force

A push or pull on an object is a force 

force changes object's speed and also its direction 

COMPARE ??

Contact force- Is applied by one object into another that is touching it

Non contact force - not touching it 

TENSION 

ELASTIC 

electrostatic force 

gravity 

which is a contact force?

1. A girl pulls the plug of an hair dryer from the socket
2. A leaf falls to the ground
3. A magnet pulls an a nail 2cm away
4. A small bit of paper is pulled towards an charged comb

Identify the given force

1. Gravity
2. magnetic
3. elastic
4. static

Gravity depends on which of the factor

1. mass of the object
2. shape of the object
3. motion of the object
4. all the above

An apple falls from a tree branch

A person uses a rope to pull a friend on a sled

A magnet holds a picture on a fridge

A person pulls a bow back and shoots the arrow

When a person stops pedalling, the bicycle slows down

Elastic 

Tension

Friction 

Magnetic 

Gravity 

For this image given identify the force and predict whether it is contact or non -contact force

For this image given identify the force and predict whether it is contact or non -contact force

describe as a contact or non-contact forces-air resistance, friction, static electricity

The force that stops the cyclist from skidding is

1. gravity
2. elastic
3. friction
4. magnetic

Josh is learning to dive. he is seen floating in the water. label the two forces

1. gravity and upthrust force of water
2. elastic and kinetic
3. magnetic and elastic
4. static and gravity

name two words learnt today