Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>End of Chapter Review>Q 10

EASY

Lower Secondary Stage 9

IMPORTANT

Earn 100

Explain, using particle theory, Why solids and liquids are denser than gases.

Important Questions on Moments, Pressure and Density

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>Exercise 1>Q 2

Use the term pivot, effort and load to explain why it is easier to turn a nut using a wrench rather than your hand. Compare the similarities and differences between the pivot, effort and load in each case.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>Exercise 2>Q 3

Nori uses a wrench to turn a nut. He uses a force of

20 N

to turn a wrench that is

0.2 m

long. What moment does he apply? Give the answer in

N m

.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>Exercise 2>Q 4

Chandra uses a hammer to pull a nail out of some wood. The hammer is

0.3 m

long and the moment she applies is

4.5 N m

. What force (in newton) does she apply?

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 1

Copy and Complete this table.

Force (N)	Area( $m^{2}$ )	Pressure( $N / m^{2}$ )
$10$	$2$
$25$		$5$
	$3$	$5$
$30$	$12$
$40$		$4$
	$5$	$6$

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>Exercise 4>Q 3

Abel cuts a slice of bread with a knife. He decides that because it was so easily cut, he must have used a lot of force. Is this correct?

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>End of Chapter Review>Q 11

Mandeep decided to investigate how much pressure exert on different shoes.

What is Mandeep going to change?

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>End of Chapter Review>Q 12

Explain why snowshoes help people to walk over snow without sinking into it.

EASY

Lower Secondary Stage 9

IMPORTANT

Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>End of Chapter Review>Q 13

When gases become hot, their particles move further apart. Explain why hot air balloons float.