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HIA International — Grade 8

Unit 1: Photosynthesis and the carbon cycle

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Unit 2: Properties of materials

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Unit 3: Forces and energy

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Unit 4: Maintaining life

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Unit 5: Reactivity

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Unit 6: Sound and space

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Unit 7: Genes and inheritance

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Unit 8: Rates of reaction

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Quiz

Checkpoint Grade 8 Unit 3 – 3.1 Gravity Weight And Mass

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Gravity Weight And Mass Checkpoint Earth and Space quiz set 2: free practice for Cambridge Checkpoint Earth And Space 0893. Work through this Gravity Weight And Mass Checkpoint Earth and Space quiz set 2 and get instant feedback on every answer. If you get stuck, review the 4.1 Gravity weight and mass lesson. More practice: Cambridge Checkpoint Earth And Space 0893 — all units. Syllabus: Cambridge Lower Secondary programme.

  • Questions count: 50
  • Passing grade: B+
  • Time limit:
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1.
A 400 kg lander has legs that can safely support a weight of up to 2000 N. Using the table, on how many of the five bodies could it land without its legs failing?
Three – Mars, the Moon and Titan
Two – the Moon and Titan only
Four – all except the Earth
Five – mass is the same everywhere
2.
The diagram shows four pairs of metal spheres. Every pair attracts by gravity. In which pair is the gravitational force between the spheres the strongest?
Dr Dabour Hub Academy - figure 1
Pair A (2 kg, 1 m)
Pair B (2 kg, 3 m)
Pair D (5 kg, 3 m)
Pair C (5 kg, 1 m)
3.
Which practical work belongs to Gravity Weight And Mass?
Evaluate a model of Solar System formation and distinguish evidence from speculation
Interpret tidal-range information and relate it to the positions of the Earth, Moon and Sun
Use force diagrams and compare motion in air with motion in a vacuum
Measure or calculate weight using W = m × g and use correct units
4.
Tariq wants to measure the weight of a 700 g pencil case on Earth as precisely as possible. Which newton meter should he choose?
A 0–1 N meter, the most sensitive
A 0–5 N meter, the closest range
A 0–10 N meter
A 0–100 N meter, the strongest
5.
A space agency built a probe with a mass of 120 kg. Its legs will collapse if its weight is more than 500 N. Using the table, where could it land safely?
On the Moon only
On the Moon and Mars only
On all three, as mass never changes
On Earth and Mars only
6.
Which definition should be paired with mass?
the units used to measure force
the quantity of matter measured in kilograms
the force of gravity measured in newtons
the attractive force between masses
7.
Which statement correctly describes mass?
the force of gravity measured in newtons
the attractive force between masses
the units used to measure force
the quantity of matter measured in kilograms
8.
Which statement correctly describes m x g?
the quantity of matter measured in kilograms
the force of gravity measured in newtons
the attractive force between masses
weight is the force of gravity measured in newtons and is calculated using W
9.
Each observation is paired with an explanation. Which pairing is correct?
A satellite stays in orbit – there is no gravity at that height
An astronaut jumps higher on the Moon – her weight there is smaller
A suitcase is hard to lift on Earth – its mass is larger on Earth
A parcel weighs less on a mountain – its mass has dropped
10.
A Mars rover weighs the same rock four times. Using the table, what is the best value for the rock's mass?
About 4.2 kg
About 54.8 kg
About 1.5 kg
About 4.0 kg
11.
A probe drops the same ball on Earth and on Planet Q, where there is no air. The graph shows the ball's speed as it falls. Which conclusion is supported by the graph?
Dr Dabour Hub Academy - figure 2
The ball has a smaller mass on Planet Q
Planet Q has no gravity after 2 seconds
Planet Q has a weaker gravitational field
The ball falls faster on Planet Q than on Earth
12.
Four sets of mass and weight readings were taken in different places. Which pairing is correct?
0.6 kg, 2.2 N – on the Moon
2 kg, 50 N – on Mars
5 kg, 8 N – on Jupiter
0.6 kg, 6 N – on Earth
13.
Leon must plan an investigation to show that g on Earth is about 10 N/kg. Which plan is best?
Weigh one 1 kg mass once and write down the reading in kg
Drop masses of different sizes and see which lands first
Hang six masses, record each weight, plot W against m and find the gradient
Measure the mass of six objects on a balance and find the mean
14.
The blue arrow is a scale drawing of the 500 N weight of a crate on Earth (g = 10 N/kg). The crate is taken to Mars, where g = 3.7 N/kg. Which red arrow, A to D, correctly shows its weight on Mars to the same scale?
Dr Dabour Hub Academy - figure 3
Red arrow A
Red arrow B
Red arrow C
Red arrow D
15.
Which statement correctly describes newtons?
the quantity of matter measured in kilograms
the attractive force between masses
the units used to measure force
the force of gravity measured in newtons
16.
An astronaut takes the beam balance, the rock and the three 1 kg masses shown to the Moon, where g = 1.6 N/kg. What will the balance show there?
Dr Dabour Hub Academy - figure 4
It stays level, as both sides get lighter equally
The rock side rises, as rock weighs less on the Moon
The masses side rises, as metal weighs less on the Moon
Nothing, because a balance will not work in low gravity
17.
Farah uses her results in the table to work out the gravitational field strength in her laboratory. Which is the best value from her data?
About 0.01 N/kg
About 9.8 N/kg
About 0.1 kg/N
About 0.98 N/kg
18.
Which step comes immediately after "identify gravitational field strength"?
record mass in kilograms
state weight in newtons
multiply m by g
19.
Which statement correctly describes weight?
the quantity of matter measured in kilograms
the attractive force between masses
the units used to measure force
the force of gravity measured in newtons
20.
A camera weighs 400 N on Earth (g = 10 N/kg) and 150 N on Planet Y. What is the gravitational field strength on Planet Y?
g = 3.75 N/kg
g = 0.375 N/kg
g = 15 N/kg
g = 26.7 N/kg
21.
Each object is paired with its weight. Which pairing is correct?
20 kg dog on Earth (g = 10 N/kg) – 2 N
5 kg bag on Jupiter (g = 25 N/kg) – 30 N
5 kg bag on the Moon (g = 1.6 N/kg) – 8 N
3 kg rock on Mars (g = 3.7 N/kg) – 3.7 N
22.
Omar wrote the table about a 75 kg astronaut. One row contains a recording mistake. Which row is it, and why?
The Mars row – her weight there should be 750 N
The Sun row – no weight can be that large
The Moon row – mass cannot change with place
The Earth row – weight should be in kilograms
23.
A spacecraft travels from the Earth to the Moon along the dashed line. At one of the points P, Q, R or S the Earth's pull and the Moon's pull on the spacecraft are equal in size. Which point is it most likely to be?
Dr Dabour Hub Academy - figure 5
Point P, close to the Earth
Point Q, exactly halfway
Point R, a little past halfway
Point S, close to the Moon
24.
A robot arm can lift a load only if the load's weight is 1200 N or less. Using the table, where could it lift a 300 kg crate?
On Venus and Mars
On Mars only
On Earth and Neptune
Nowhere, as 300 kg > 1200 N
25.
Mars can come within about 55 million km of the Earth, while the Sun is about 150 million km away. Why is the Sun's gravitational pull on the Earth still far stronger than Mars's pull?
Gravity gets stronger with greater distance
The Sun's mass is enormous compared with Mars
Mars is too small to have any gravity
The Sun's heat adds to its pull
26.
A skier stands still on a slope. The dot marks the skier's centre of mass. Which arrow, P, Q, R or S, correctly shows the skier's weight?
Dr Dabour Hub Academy - figure 6
Arrow labelled P
Arrow labelled Q
Arrow labelled R
Arrow labelled S
27.
A satellite orbits the Earth clockwise. At point X, the Earth's gravity suddenly stops acting on it. Which path, A to D, would the satellite then follow?
Dr Dabour Hub Academy - figure 7
Path A, the same circle around the Earth
Path B, a straight line along its direction of motion
Path C, straight down towards the Earth
Path D, pushed diagonally away from the Earth
28.
Each change to a 5 kg metal block is paired with its effect. Which pairing is correct?
Taken to Jupiter – weight goes up, mass unchanged
Cut in half on Earth – mass halves, weight unchanged
Taken to the Moon – mass and weight both fall
Taken into deep space – mass becomes zero
29.
Which of these is the FIRST step in the correct order?
identify gravitational field strength
multiply m by g
state weight in newtons
record mass in kilograms
30.
Which statement correctly describes gravity?
the quantity of matter measured in kilograms
the units used to measure force
the attractive force between masses
the force of gravity measured in newtons
31.
Hana notices in the table that Saturn has 95 times the mass of the Earth but almost the same surface g. Which conclusion is best supported?
g also depends on the distance to the planet's centre
The table is wrong, as g depends only on mass
Saturn's large mass makes its gravity repel objects
Mars must have more mass than Saturn has
32.
Which term is described as: the attractive force between masses?
mass
newtons
gravity
weight
33.
Which term is described as: weight is the force of gravity measured in newtons and is calculated using W?
mass
gravity
m x g
weight
34.
Which term is described as: the units used to measure force?
mass
gravity
newtons
weight
35.
Which term is described as: the force of gravity measured in newtons?
mass
gravity
newtons
weight
36.
Which term is described as: the quantity of matter measured in kilograms?
weight
gravity
newtons
mass
37.
Gravitational field strength, g, is the _____ acting on each kilogram of mass, measured in N/kg.
amount of matter
gravitational force
speed of falling
air resistance
38.
Kiran increases the mass hanging on a newton meter from 0.3 kg to 0.9 kg. The weight reading becomes _____ as large.
six times
the same size
three times
one-third
39.
A space rover weighs 2400 N on Earth, where g = 10 N/kg. Its mass is _____.
240 kilograms
24 000 kilograms
2400 kilograms
240 newtons
40.
Statement: "With no air on either, a stone dropped on the Moon speeds up more slowly than a stone dropped on the Earth." True or false?
True – the Moon's gravity is weaker
False – all objects fall at the same rate everywhere
False – stones float on the Moon
True, because the stone's mass is smaller there
41.
Statement: "The gravitational pull between two parked lorries is much weaker than the pull of the Earth on either lorry, because the Earth's mass is so much greater." True or false?
False – the lorries do not attract each other at all
False – the lorries are closer, so their pull is larger
True, but only if the lorries are touching
True – the Earth's mass is far greater
42.
In an investigation of how weight depends on mass, Sara says: "The newton meter I use and the place where I take readings are control variables." True or false?
False – they are the dependent variables
True – both must stay the same
False – the place is the independent variable
True, but only the newton meter matters
43.
Statement: "On any planet, the gradient of a graph of weight (N) against mass (kg) is equal to that planet's gravitational field strength." True or false?
False – the gradient equals the mass
False – the gradient is always 10 N/kg
True – gradient = W ÷ m = g
True, but only on the Earth
44.
The Sun has g ≈ 274 N/kg at its surface. Statement: "An astronaut would weigh about 27 times more there than on Earth, but her mass would not change." True or false?
True – 274 ÷ 10 ≈ 27
False – her mass would also be 27 times more
False – the Sun has no gravity as it is a gas
True, and her mass would be 27 times less
45.
Statement: "A newton meter that was checked on Earth would give a wrong value for the weight of an object on the Moon." True or false?
True – it would still show the Earth weight
True – springs do not stretch on the Moon
False – it would show the mass instead
False – it measures force, so it reads the Moon weight
46.
Statement: "A climber's weight is very slightly smaller at the top of a high mountain than at sea level." True or false?
False – her weight is larger, being nearer the Sun
False – weight is the same everywhere on Earth
True – she is further from Earth's centre
True, because her mass is smaller up there
47.
A rock with a mass of 2 kg is brought back from the Moon. On Earth its mass is still 2 kg, but its weight is about 6 times larger than on the Moon. True or false?
False – the statement is wrong
True – the statement is correct
False – its mass is 6 times larger on Earth
False – its weight is the same in both places
48.
Statement: "Weight is a non-contact force, because gravity acts between objects even when they are not touching." True or false?
False – weight only acts when you stand on a surface
False – weight is a contact force from the ground
True – gravity acts at a distance
True, but only in air, not in space
49.
Use the table. Statement: "In the first 60 s the rocket's weight falls by 1 500 000 N because it burns 150 000 kg of fuel." True or false? (Ignore the small change in g with height.)
False – weight only changes with the planet
True – 150 000 kg × 10 N/kg
False – it falls by 150 000 N
True, but only once it reaches space
50.
Statement: "A 1 kg bag on Jupiter (g = 25 N/kg) weighs more than a 2 kg bag on Earth (g = 10 N/kg)." True or false?
False – the 2 kg bag always weighs more
True – 25 N is more than 20 N
False – both bags weigh the same, 10 N
True, because the 1 kg bag gains mass
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Part of Unit 3: Forces and energy — see every lesson and quiz in this unit.
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