EASY
Lower Secondary Stage 9
IMPORTANT
Earn 100

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.

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 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 2>Q 5
Olamide uses a screwdriver to open a tin of paint. She applies a force of 15 N and moment of 3 N m. How long is the screwdriver (in m)?
MEDIUM
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>Exercise 2>Q 6
Inga and Mazin sit on a see-saw. Inga weighs 60 N and sits 1.2 m from the pivot. Mazin sits 0.9 m from the pivots and the see-saw is balanced. How much does Mazin weigh?
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(m2) Pressure(N/m2)
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 2
Isidor decides to measure the pressure of some object by pressing each one into some modelling clay to measure the area it has. What must Isidor keep the same to measure the pressure?
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>Exercise 4>Q 4
Agnar wants to measure the pressure two of his classmates exert on the floor when they stand in their bare foot. He measures Rupinder's foot area and her weight when she takes her shoes off; and he measures Kauri's foot area and his weight when he is wearing shoes. Why is this not a fair test?