Cambridge Primary 5 Science: Forces and Motion This lesson quiz helps learners interpret pushes and pulls, balanced and unbalanced forces, and changes in motion.
Use the model. What is a force?
A
a state of matter
B
a push or a pull
C
a type of light
D
a sound only
Explanation
Forces are pushes and pulls.
Which force can start an object moving?
A
a balanced pair of equal forces
B
no force at all
C
an unbalanced push
D
a shadow
Explanation
Unbalanced forces can change motion.
What can forces change?
A
only mass
B
only age
C
only colour
D
speed, direction or shape
Explanation
Forces can affect motion and shape.
If two equal forces act in opposite directions, what are they called?
A
balanced forces
B
light rays
C
magnetic colours
D
evaporating forces
Explanation
Equal opposite forces have zero resultant force.
What happens when forces on a moving object are balanced?
A
It must speed up
B
Its motion does not change
C
It must stop instantly
D
It becomes a gas
Explanation
Balanced forces do not change velocity.
What happens when forces are unbalanced?
A
The object must be transparent
B
Matter disappears
C
Motion may change
D
Nothing can ever change
Explanation
Unbalanced resultant force causes acceleration or deceleration.
Which force pulls objects toward Earth?
A
air resistance only
B
magnetism always
C
friction
D
gravity
Explanation
Gravity pulls masses together.
Which force opposes sliding motion?
A
friction
B
sound
C
gravity only
D
light
Explanation
Friction acts against relative motion between surfaces.
Which force opposes motion through air?
A
upthrust only
B
air resistance
C
magnetism
D
weight
Explanation
Air resistance is drag from air.
Which is a contact force?
A
gravity
B
electrostatic force at a distance
C
friction
D
magnetic force at a distance
Explanation
Friction needs surfaces touching.
Which is a non-contact force?
A
push by hand
B
normal contact force
C
friction
D
gravity
Explanation
Gravity acts at a distance.
What is weight?
A
the force of gravity on an object
B
how shiny it is
C
the same as volume
D
the amount of space it takes
Explanation
Weight is a force measured in newtons.
What unit is commonly used for force?
A
litre
B
newton
C
gram per centimetre only
D
degree Celsius
Explanation
Force is measured in newtons.
Which instrument measures force?
A
thermometer
B
measuring cylinder
C
force meter
D
stopwatch only
Explanation
A force meter or newton meter measures force.
A cyclist pedals harder and speeds up. What caused the speed change?
A
balanced forces only
B
no force
C
condensation
D
unbalanced forward force
Explanation
The forward force exceeded opposing forces.
A ball changes direction when kicked. What did the force change?
A
direction of motion
B
colour only
C
mass directly
D
state of matter only
Explanation
Forces can change direction.
A spring stretches when pulled. What did the force change?
A
chemical identity
B
shape
C
transparency
D
temperature only
Explanation
Forces can deform objects.
Why does a heavier object often need a larger force to accelerate the same amount?
A
It has no gravity
B
It is always magnetic
C
It has more mass
D
It is transparent
Explanation
More mass requires more force for the same acceleration.
Which diagram would show a larger resultant force to the right?
A
no arrows
B
only a downward arrow
C
equal arrows both ways
D
a long right arrow and short left arrow
Explanation
The right force is larger than the left force.
Which summary is correct?
A
Unbalanced forces change motion; balanced forces do not
B
Forces cannot change shape
C
Forces only work on living things
D
All forces are visible
Explanation
This is the core idea for motion.