ACTIVITY BOOK ANSWERS

 Click on the link and download the answers for the activity book.

Activity book’s answers

FINAL REVIEW QUESTIONS updated with answers

Answer these questions in your notebook when you think that you are ready.

You can take it as a mock exam.

Unit 5 Review: Forces

1. What is the difference between a contact and non contact force?

2. Is a push force a contact, non-contact or both?

3. What is an example of a non-contact force?

4. Magentism is a contact force. (True or False)

5. What happens when two opposite equal forces are applied to a table? 

6. Write an example of an object that changes shape forever when a force isapplied. 

7. What is the definition of magnetisim?

8. What is a natural magnet?

9. What is a man-made magnet?

10. What do magnets create around them?

11. Why does the needle on a compass point North?

12. Opposite poles ____________ eachother.  (repel/attract)

13. Same poles of a magnet _______________. (push apart/pull together)

14. How many poles does a magnet have?

15. What is the definition of gravity?

16. Because of gravity we can lift objects of a large mass. (True or False)

17. What is mass?

18. How do we measure mass?

19. What is the equation for weight?

20. How do we measure weight?

21. What is upthrust?

22. Because of upthrust, a bird can fly. (True or False)

23. What two components influence the amount of upthrust?

24. An object with a __________ mass and a __________ volume has a lot ofupthrust. (Small or big)

25. What is buoyancy?

1. The difference between a contact force and a non contact force is that with contact forces one object orperson moves another by touch whereas  in non-contact forces the force moves objects without touch.

2. Both

3. Magnetism

4. False

5. The forces are balanced and the table doesn´t move.

6. Smashing a can, chocolate breaking

7. Magnetism is a non-contact force that pushes or pullsand object

8. Magnetite

9. Iron & Steel

10. A magnetic field

11. Magnetism

12. Attract

13. Push apart

14. Two

15. Gravity is a non-contact force that pulls towards thecenter of objects.

16. False

17. Mass is the amount of matter in an object.

18. In kilograms.

19. Mass(kg) x Gravity = Newtons

20. In Newtons

21. A contact force applied by water and air. It pushesobjects in air and water up. 

22. True

23. Mass and volume

24. Small , Big

25. The ability of an object to float in a liquid

QUIZ ON KAHOOT

UPDATED WITH NEW QUESTIONS 17-3-2020

Find out how  much you know about magnetism and gravity!!!

You need your parents premission to install kahoot on a tablet or mobile phone.

Follow the link below to find our kahoot!

It is called forces, created by LUISCIENCE, sure you can find it and get a great score!!!

https://create.kahoot.it/share/forces/51f0b4e4-0158-4e6c-8164-7d0ad46e0f69

Upthrust and buoyancy: updated with answers

Read page 93.

Write in your notebook:

What is buoyancy?________________

Buoyancy is the ability of an object to float in a liquid.

Exercise 4 page 93

You have to indicate the direction of the different forces depicted on your drawing with arrows.

Review 1 updated with solutions

Complete  exercises 1, 2, 3  form page Page 94

Write 3 questions about the topic and answer the with full sentences.
What type of force is upthrust? Upthrust is a contact force applied by water or air.
What is the name of the force that pulls objects towards the centre of the earth? The force that pulls towards the centre of the earth is gravity.
Why the gravity of the earth is bigger than the gravity from the moon? Because earth’s mass is bigger than moon’s.


These are the answers for the exercises on pages 94 and 95.

Upthrust 2

Time to review!!

Write down in you notebook the definition of this words.
You can look for information in you book or in the blog’s dictionary.

• Mass
• Volume
• Density
• Upthrust

Now complete exercise 3 from page 93, draw a  picture in a white paper that you will paste later on your notebook. This is going to be our ARTS  work for this week

You have to draw a situation where the opposite forces of gravity and upthrust  pull against other, for example something that is floating in a river.

Draw nice details and color it nicely, remember to apply the background color softly.

Upthrust 1

Hi! Today you are going to watch 2 videos to understand what upthrust means.

Now its time   to read page 92 and  copy the orange box.

Gravity and weight 2-updated with solutions

Firstly we are going to revise a little:

Answer in your notebook:

What is gravity:___________________

Why is the moon attracted towards the earth?__________________

Is it easier to walk on the moon or on the earth? ____________

Why?_______________

What is gravity: is a non contact force, it also a pull force.

Why is the moon attracted towards the earth? because the earth’s gravity force is stronger due to is larger mass

Is it easier to walk on the moon or on the earth? it is easier to walk over the earth

Why? the force that pulls towards the centre of the moon is smaller, so when someone tries to walk over the moon floats and lands slowly.

 Now copy the orange box from page 89 and read the explanation.

Finally complete exercise 3 from page 89, exercise 4 is optional.

Gravity and weight 1

Now complete you summary of page 88 in your notebook.

VOCABULARY

COMPLETE USING THE WORDS FROM THE BOX+SOLUTIONS

VOCABULARY REVIEW

Attract: pull towards.
Atraer: tirar hacia uno mismo.
Balanced force: force that is opposite and
equal.
Fuerza equilibrada: fuerza opuesta e igual.
Contact force: visible force that touches the
object it’s acting on.
Fuerza de contacto: fuerza visible que toca
el objeto sobre el que está actuando.
Magnetism: invisible non-contact, push or pull
force, created by a magnet.
Magnetismo: fuerza invisible y sin contacto,
de empujar o tirar, creada por un imán.
Non-contact force: invisible force that doesn’t
touch the object it's acting on.
fuerza sin contacto: fuerza invisible que no
toca el objeto sobre el que está actuando.
Repel: push away.
Repeler: empujar.