EVS4_CH13_FORCE, WORK AND ENERGY

EVS4_CH13_FORCE, WORK AND ENERGY

By Angelita Comilang

STEPPING STONE: PAGE 139

By Angelita Comilang

Multiple Choice

What is force?

• is a push and a pull of an object

• is when you push an object to move

• is when you pull an object to move

• When you apply energy to an object at rest only

STEPPING STONE: PAGE 139

By Angelita Comilang

Multiple Select

Force can? Choose more than 1 answer

• change shape

• make an object move

• Stop the moving object

• change direction

• none of these

RECALL:

Force is a push or a pull​.

RECALL: Force can:

-make things move

-stop the moving object

-change direction

-​change shape

Learning Objectives:

Chapter 13: Force. Work and Energy

1. Distinguish between the different kinds of forces

2. ​State some examples of each of the kinds of forces

3. Relate the importance of the different king of forces ​

What Force is applied?

1. Muscular Force

​-The force which is exerted by our muscles.

--Any kind of movement done by our body is an example of muscular force.​​

1. Muscular Force

​​-Examples:

We use muscular force to lift our school bag or to turn the page of this book. ​

-kick the football​

What is the applied Force below?

2. Mechanical Force

​-The force used by machines.

-The force generated by the means of a machine.​

​

2. Mechanical Force

​-The force used by machines.

​Example, when a car gets started, its engine creates a mechanical force on the tires that help the car to accelerate.

• ​We use cranes to lift heavy things.

What is the applied Force below?

3. ELASTIC Force

​-is to stretch or compress an object an elastic material.

-The force that allows some materials to return to its original shape
after being stretched
or compressed.​

3. ELASTIC Force

​-examples:

An archer uses elastic force of the bow string to shoot an arrow.

-A pole vaulter uses the elastic force of a flexible pole to
jump high.​

What is the applied Force below?

4. Gravitational Force

​-the force with which the Earth pulls things towards its center​.

​​-Everything that has mass is pulled towards the Earth due to the force of gravity. That is why all objects fall on the ground.​

​

4. Gravitational Force

​

-Examples: ​When trees shed their leaves and ripe fruits fallen on the ground, they fall down.

​

-The earth revolve around the sun.

​

What is the applied Force below?

5. Frictional Force

​-is a force that acts on an object to slow it down.

-It always acts opposite to the direction of

motion of the object.​

​

5. Frictional Force

Examples: A bicycle slows down and stops after a distance if you stop pedaling it​.

-The ball slow down to stop.

What is the applied Force below?

6. Magnetic Force

• A magnet attracts some metals and metal objects.

  ​

• Examples:​ We often stick beautiful fridge magnets on our refrigerators. The iron nails attracted to the magnet

Isaac Newton

-he discovered force.​

Unit of force

-Newton(N)​

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