Forces 5º

FORCES

4- FRICTION

3- HOW FORCES ACT.

2-EFFECTS OF FORCES

1- WHAT IS FORCE?

TABLE OF CONTENTS

1- WHAT IS FORCE?1.1- Definition.1.2 -Classify

TABLE OF CONTENTS 1

What is force?

It is a push or pull applied on objects.

PUSH OR PULL?

EFFECTS OF FORCES

2. EFFECTS OF FORCES2.1 Start moving2.2 Stop moving2.3 Change direction.2.4 Change shape temporarily. 2.5 Change shape permanently2.6 Break2.7 Repaso en español.2.8 Read your Science book2.9 Complete the diagram

TABLE OF CONTENTS 2

In this video you can see that the football player Roberto Carlos kicks the penalty. The ball is still until the football player kicks the ball. FORCE IS APPLIED TO THE BALL AND THE BALL STARTS MOVING.

In this video you can see that the goalkeeper Iker Casillas saved the penalty. The ball was moving towards the goal but the goalkeeper stopped it. FORCE IS APPLIED TO STOP THE BALL

In this video Rafa Nadal and Federer are playing tennis. They hit the tennis ball and the tennis ball changes direction. FORCE IS APPLIED TO CHANGE THE DIRECTION OF THE TENNIS BALL.

In this video you can see Pilar Rubio. She is doing sport with an elastic band. The elastic band changes shape. PILAR RUBIO APPLIES FORCE TO THE ELASTIC BAND AND THE ELASTIC BAND CHANGES SHAPE TEMPORARILY.

FORCE IS APPLIED TO PLAY DOUGH AND IT CHANGES ITS SHAPE PERMANENTLY.

In this video you can see how to crack an egg. FORCE IS APPLIED TO BREAK THE SHELL OF THE EGG.

Repasamos en español para asegurarnos de que tenemos todas las ideas principales sobre LOS EFECTOS DE LAS FUERZAS.

REPASO Libro de 4ºBook page 74

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Read your book page 88

Read your book page 88

Read your book page 89

1 Copy and complete this diagram in your notebook

3. HOW FORCES ACT3.1 When two objects come into contact vs when there is no contact between objects.

TABLE OF CONTENTS 3

WHEN THERE IS NO CONTACT BETWEEN OBJECTS

WHEN TWO OBJECTS COME INTO CONTACT

HOW FORCES ACT

VS

CONTACT FORCES VS NON- CONTACT FORCES

4. FRICTION4.1 What is friction?4.2 Activity 14.2 Activity 24.3 Activity 34.4 Activity 44.5 Air resistance

TABLE OF CONTENTS 4

FRICTION

FRICTION IS THE FORCE THAT SLOWS DOWN A MOVING OBJECT WHEN IT IS IN CONTACT WITH ANOTHER OBJECT.

FRICTION: EXAMPLES

FRICCIÓN ES: una fuerza que disminuye la velocidad de un objeto que se mueve. FRICCIÓN NECESITA: contacto entre dos superficies/objetos.FRICCIÓN CAMBIA: cuanto más lisa sea una superficie/objeto menor será la fricción o cuanto más rugosa sea la superficie/ el objeto mayor será la fricción. -

1. Title of the activity: Friction2 Identify the two surfaces/ objects that are in contact in these four images.

ACTIVITY 1: Do it in your notebook.

ACTIVITY 2:

Sort the images of the next two pages

4.

3.

2.

1.

NOT MUCH FRICTION

4.

3.

2.

1.

A LOT OF FRICTION

A lot of friction or Not many friction

A lot of friction or Not many friction

Activity 3: COMPLETE IN YOUR NOTEBOOK

Friction is a _______ caused by two------- moving over each other. ------- surfaces produce more friction than _________ surfaces.

SURFACES FORCE ROUGH SMOOTH

Activity 4: Este ejercicio está en vuestro libro en la página 88. Tenéis que escribir dos frases que comiencen por "When the girl kicks the .... the ... will....."

AIR RESISTANCE

SPEED tells us how fast an object moves. To calculate speed, we divide a distance by the time it takes to travel this distance.

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Speed problem 1

A car leaves Madrid at 8.00 am and arrives in Salamanca at 11.00 am. If the distance is 240 km, what was the average speed of the car?

Speed problem 2

A car takes 4 hours to travel 244 km. Calculate the average speed of this car.

Speed problem 4

Mª José Martín runs 50 kilometres in 2 hours. Calculate Mª Jose´s average speed .

Speed problem 3

The distance from Salamanca to Orense by rail is 420 km. At what average speed must a train travel to cover this distance in 4 hours?

La chica no está pedaleando, sólo hay fricción -- speed decreases.

La fuerza del pedaleo es igual que la fricción -speed remains constant.

La fuerza del pedaleo es mayor que la fricción -- speed increases

Depending on the forces acting on the bike its speed increases, remains constant or decreases.

• La flecha azul: fuerza de pedalear.
• La flecha roja: fricción.

La chica no está pedaleando, sólo hay fricción -- speed decreases.

La fuerza del pedaleo es igual que la fricción -speed remains constant.

La fuerza del pedaleo es mayor que la fricción -- speed increases

Depending on the forces acting on the bike its speed increases, remains constant or decreases.

• La flecha azul: velocidad
• La flecha roja: fricción.
• La flecha morada: fuerza de pedalear.

Draw arrows to show ALL the forces acting on the ice skater.

Draw arrows to show ALL the forces acting.

Draw arrows to show ALL the forces acting.