IGCSE Physics - Mass & Weight

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IGCSE Physics Paper 1 revision notes

Text of IGCSE Physics - Mass & Weight

MASS & WEIGHTJUNE 2002

1

What are correct units used for mass and for weight? mass A B C D kg kg N N weight kg N kg N

2

Two objects X and Y are placed on a beam as shown. The beam balances on a pivot at its centre. Y X

pivot

What does this show about X and Y? A B C D They have the same mass and the same density. They have the same mass and the same weight. They have the same volume and the same density. They have the same volume and the same weight.

NOVEMBER 20023 Which of the following statements is correct? A B C D Mass and weight are different names for the same thing. The mass of an object is different if the object is taken to the Moon. The weight of a car is one of the forces acting on the car. The weight of a chocolate bar is measured in kilograms.

1

4

In an experiment, six identical bags of flour are balanced by a 9 kg mass.

six bags of flour pivot

9 kg mass

Two bags of flour are removed. What mass will balance the remaining bags? A 3 kg B 6 kg C 7 kg D 9 kg

JUNE 2003

5

Which statement is correct? A B C D Mass is a force, measured in kilograms. Mass is a force, measured in newtons. Weight is a force, measured in kilograms. Weight is a force, measured in newtons.

6

Three children, X, Y and Z, are using a see-saw to compare their weights. X Y Y Z X Z

Which line in the table shows the correct order of the childrens weights? heaviest A B C D X X Y Y

Y Z X Z

lightest Z Y Z X

2

NOVEMBER 2003

7

A beam is pivoted at its centre. Two masses are suspended at equal distances from the pivot as shown in the diagram.

pivot

block X Which statement is correct? A B C D 8 If X has a mass of exactly 2 kg, it will rise. If X has a mass of less than 2 kg, it will fall. If X has a mass of more than 2 kg, it will fall. If X has a mass of more than 2 kg, it will rise.

2 kg mass

The mass of a full bottle of cooking oil is 1.30 kg. When exactly half of the oil has been used, the mass of the bottle plus the remaining oil is 0.90 kg. What is the mass of the bottle? A 0.40 kg B 0.50 kg C 0.65 kg D 0.80 kg

JUNE 20049

Which statement about the mass of a falling object is correct? A B C D It decreases as the object falls. It is equal to the weight of the object. It is measured in newtons. It stays the same as the object falls.

3

10 The weights of four objects, 1 to 4, are compared using a balance.

2 1 3

2

4 2

Which object is the lightest? A object 1 B object 2 C object 3 D object 4

NOVEMBER 200411 A spring is stretched by hanging a piece of metal from it.

spring

metal

What is the name given to the force that stretches the spring? A B C D friction mass pressure weight

JUNE 200512 Which statement is correct? A B C D The mass of a bottle of water at the North Pole is different from its mass at the Equator. The mass of a bottle of water is measured in newtons. The weight of a bottle of water and its mass are the same thing. The weight of a bottle of water is one of the forces acting on it.

4

13 Two blocks X and Y are placed on a beam as shown. The beam balances on a pivot at its centre.Y X

pivot

What does this show about X and Y? A B C D They have the same mass and the same density. They have the same mass and the same weight. They have the same volume and the same density. They have the same volume and the same weight.

NOVEMBER 200514 What is the gravitational force that the Earth exerts on an object? A B C D the density of the object the mass of the object the volume of the object the weight of the object

15 In an experiment, five identical bags of rice are balanced by a 10 kg mass.

five bags of rice pivot

10 kg mass

Two bags of rice are added to the other five. What mass will now balance the bags? A 3.5 kg B 7.0 kg C 10 kg D 14 kg

5

JUNE 2006

16 Below are four statements about the effects of forces on objects. Three of the statements are correct. Which statement is incorrect? A B C D A force can change the length of an object. A force can change the mass of an object. A force can change the shape of an object. A force can change the speed of an object.

17 A simple balance has two pans suspended from the ends of arms of equal length. When it is balanced, the pointer is at 0. pivot arm

pointer 0

pan X

pan Y

Four masses (in total) are placed on the pans, with one or more on pan X and the rest on pan Y. Which combination of masses can be used to balance the pans? A B C D 1 g, 1 g, 5 g, 10 g 1 g, 2 g, 2 g, 5 g 2 g, 5 g, 5 g, 10 g 2 g, 5 g, 10 g, 10 g

6

NOVEMBER 200618 A newton is a unit of force. Which quantity is measured in newtons? A B C D acceleration density mass weight

JUNE 200719 The diagram shows a bird in flight. In which direction does the weight of the bird act?B

A

C

D

7

20 The mass of a full bottle of cooking oil is 1.30 kg. When exactly half of the oil has been used, the mass of the bottle plus the remaining oil is 0.90 kg.

What is the mass of the empty bottle? A 0.40 kg B 0.50 kg C 0.65 kg D 0.80 kg

NOVEMBER 200721 What are the correct units for force and for weight? force A B C D kg kg N N weight kg N kg N

8

22 The table shows the weight of a 10 kg mass on each of five planets. planet Mercury Venus Earth Mars Jupiter weight of a 10 kg mass / N 40 90 100 40 250

On which planets would an astronaut have a smaller weight than on Earth? A B C D Mercury, Mars and Jupiter Mercury, Venus and Mars Mercury, Venus and Jupiter Venus, Mars and Jupiter

JUNE 200823 The force of gravity acting on an astronaut in an orbiting spacecraft is less than when she is on the Earths surface. Compared with being on the Earths surface, how do her mass and weight change when she goes into orbit? mass in orbit A B C D decreases decreases unchanged unchanged weight in orbit decreases unchanged decreases unchanged

9

24 When two blocks X and Y are placed on a uniform beam, the beam balances on a pivot at its centre as shown.Y X

pivot

What does this show about X and Y? A B C D They have the same mass and the same density. They have the same mass and the same weight. They have the same volume and the same density. They have the same volume and the same weight.

NOVEMBER 200825 What is the meaning of the weight of an object? A B C D the density of the material from which it is made the force exerted on it by gravity the mass of the matter it contains the pressure it exerts on the floor

10

26 The weight of an object is to be found using the beam balance shown in the diagram.

object

?The object is put in the left-hand pan and various standard weights are put in the right-hand pan, with the following results. weights in the right hand pan 0.1 N, 0.1 N, 0.05 N, 0.02 N 0.2 N, 0.1 N, 0.01 N effect balance tips down slightly on the left-hand side balance tips down slightly on the right-hand side

What is the best estimate of the weight of the object? A 0.27 N B 0.29 N C 0.31 N D 0.58 N

JUNE 200927 Which statement about the masses and weights of objects on the Earth is correct? A B C D A balance can only be used to compare weights, not masses. Heavy objects always have more mass than light ones. Large objects always have more mass than small ones. Mass is a force but weight is not.

11

28 The table shows the weight in newtons of a10 kg mass on each of four planets. planet Earth Jupiter Mercury Venus weight of a 10 kg mass / N 100 250 40 90

The diagram shows a force meter (spring balance) being used.

18 N

2.0 kg

On which planet is the force meter (spring balance) being used? A B C D Earth Jupiter Mercury Venus

NOVEMBER 200929 Which property of a body can be measured in newtons? A B C D density mass volume weight

12

30 A cup contains hot liquid. Some of the liquid evaporates as it cools. What happens to the mass and to the weight of the liquid in the cup as it cools? mass A B C D decreases decreases stays the same stays the same weight decreases stays the same decreases stays the same

JUNE 2010

31 Two blocks of metal X and Y hang from spring balances as shown in the diagram.

N0 1 2 3 4 5

N0 1 2 3 4 5

X Y

What does the diagram show about X and Y? A B C D They have the same mass and the same volume but different weights. They have the same mass and the same weight but different volumes. They have the same mass, the same volume and the same weight. They have the same weight and the same volume but different masses.

13

32 The graph shows how weight varies with mass on planet P and on planet Q.400 weight / N 300 planet Q planet P

200

100

0 0 20 40 60 80 mass / kg

An object weighs 400 N on planet P. The object is taken to planet Q. Which row is correct? mass of object on planet Q / kg A B C D 40 40 80 80 weight of object on planet Q / N 200 400 200 400

14

NOVEMBER 201033 The reading on a spring balance with a holder and eight identical discs is 3.0 N. Six discs are removed and the reading becomes 1.2 N.

N0 1 2 3 4

spring balance

N0 1 2 3 4

holder for discs eight discs

two discs

What is the weight of one disc? A 0.2 N B 0.3 N C 0.5 N D 0.6 N

JUNE 2011

34 Which statement about mass and weight is correct? A B C D Mass and weight are both forces. Neither mass nor weight is a force. Only mass is a force. Only weight is a force.

NOVEMBER 201135 The weight of an object