Tutorial World Primary 5
 
Name:_________________________ Date:_______________
 

Forces (4.2)

A. Write the number of the correct answer in the brackets.
1. When a force is applied to a moving object and in the same direction as the moving object, the object will ________. ()
(1)
(2)
(3)
(4)

 
stop
move faster
move slower
change its direction
2. It is tiring to climb up a flight of stairs because ________. ()
(1)
(2)
(3)
(4)

 
of atmospheric pressure
of friction forces
the steps are too wide
it is against the direction of gravity
3. The strength of a magnet will decrease when it is ________. ()
(1)
(2)
(3)
(4)

 
placed under the sun for a long time
properly stored
not being used regularly
kept in a cool place
4. Ball bearings are being used in many machines because they help to ________. ()
(1)
(2)
(3)
(4)

 
reduce heat and noise
magnetise the machines
increase friction
slow down the motion of machine parts
5. When a weight is hung at one end of a spring, the spring ________. ()
(1)
(2)
(3)
(4)

 

compresses
becomes crooked
extends
causes the weight to become lighter
B. Write "T" for true and "F" for false.
1. When a ball is rolling down a slope, no work is done.
 
()
2. The unit of weight is kilometre.
 
()
3. The strength of a natural magnet cannot be increased by any means.
 
()
4. The greater the force, the lesser the energy required.
 
()
5. Wax can be used as a lubricant to reduce friction.

 

()
C. Fill in the blanks with the most suitable word.
1. There are different types of motion. The rotating blades of an electric fan is best described as ____________ motion.
 
2. A car does work by carrying people from one place to another. The car gets its energy from the burning of ____________.
 
3. The strength of a magnet is strongest at its ____________.
 
4. The spring balance is a ____________ machine.
 
5. The gravitational pull on the moon is ____________ than that on the Earth.

 

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