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Force Diagrams

• Force diagrams show which forces are acting on an object in specific directions. You can deduce if the forces are balanced or unbalanced.
• E.g. book on a table

• If the forces are balanced on moving object it carries on moving in the same direction with a steady speed
• E.g. an accelerating car

The orange arrow = driving force of 1500N which makes the car same directionmove forward

The yellow arrow= same directionopposite frictional force of 500N

Unequal sized arrows = unbalanced forces = car accelerates in direction of orange arrow.

• If in a force diagram the forces are acting on the same line (forward and backwards OR up and down), adding and subtracting forces gives you the overall force.
• This helps you to see if an object is: accelerating, decelerating or staying at steady speed.
• Forces acting in opposite directions = subtract
• Forces acting in same direction= add

How long have you…? (present perfect 4) Exercises

Use the information given to create questions beginning with ‘How long…?’

• It is snowing.

• The weather is shining.

• John and Kate are married.

• My brother has gone on holiday.

• My aunty and uncle live in Canada.

• My sister is a teacher.

• I work at the chemist.

• I’ve known Susan since I was a baby.

• Jonathan is learning to speak to Mandarin.

Fill in the missing gaps in the sentences using the present perfect (=has/have + past participle)

• I have known Kate a long time.

• My brother has been playing the piano he was 11 years old.

• My mum and dad on holiday to America. They

gone since last Sunday.

• I Ben and Emma since primary school.

We to the same primary and secondary school.

• My sister learning to speak French because she
is going to France next month.

Use the appropriate words in the missing gaps.

have you lived       lives      to

has been       works        have known

I have bought       have worked.

• My sister in Spain. She is studying Spanish

with her friend Rosie. I Rosie since I was 5.

• Spencer like with Jamie. They have worked

together for 2 years.

• How long in Australia?

• a new dress for prom.

• He to Thorpe park.

Challenge: Create 4 of your own questions beginning with ‘How long……?’

1.

2.

3.

4.

1 2 3 4 5 6

“Every accomplishment starts
With the decision to try.” Gail Dever

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