Tutorial World Primary 5
 
Name:_________________________ Date:_______________
 

Forces (4.1)

A. Write the number of the correct answer in the brackets.
1. All objects have weight because ________. ()
(1)
(2)
(3)
(4)

 
they are heavy
they have forces
of the Earth's gravity
of the atmosphere
2. Which of the following action requires the most energy? ()
(1)
(2)
(3)
(4)

 
Sitting on a bench.
Walking on level ground.
Walking down a slope.
Walking up a slope.
3. If we want to slow down a moving object, we need to apply a force ________ the moving object. ()
(1)
(2)
(3)
(4)

 
in the same direction as
in the opposite direction to
to the right side of
on top of
4. When we are flying a kite, the kite is able to float in the air because ________. ()
(1)
(2)
(3)
(4)

 
we are pulling the string
the atmosphere is supporting it
the kite has forces of its own
the wind is pushing against it
5. Which one of the following cannot directly create a force? ()
(1)
(2)
(3)
(4)

 

Heat from the Sun.
Wind.
Flowing water.
Compressed air.
B. Write "T" for true and "F" for false.
1. A non-living thing cannot move by itself unless a force is applied to it.
 
()
2. We cannot see a force but we can see the effects of a force.
 
()
3. A magnet exerts a pushing force on non-magnetic substances.
 
()
4. When work is done, some energy has been used up.
 
()
5. Smooth surfaces produce more friction than rough surfaces when rubbed together.

 

()
C. Fill in the blanks with the most suitable word.
1. When we are pushing or pulling an object, we are applying a ____________ on the object.
 
2. The Earth exerts a pulling force known as ____________ on all the things in this world.
 
3. When two surfaces are rubbed against each other, ____________ is produced.
 
4. ____________ is used to reduce friction produced by moving parts in an engine.
 
5. A moving object can do work because it possesses ____________.

 

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