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Review questions

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This activity contains 20 questions.

Question 1.
Identify which of the following is not a contact force.

 
End of Question 1


Question 2.
ch7a.jpg

This diagram shows the four forces involved and their direction of 'action' as a person is skateboarding.
Identify which of the four forces corresponds to weight force.

 
End of Question 2


Question 3.
ch7a.jpg

Assuming that the skateboarder shown in the diagram is not moving, identify the correct statement about the forces.

 
End of Question 3


Question 4.
Recall the term scientists use to describe a change in the speed of an object.

 
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Question 5.
If forces in one direction are the same size as the forces in the opposite direction, they will balance. Identify the correct statement about when forces are balanced on an object.

 
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Question 6.

ch7b.jpg

Friction is a force between two sliding or rolling objects that acts to slow the object down. The diagram shows the direction of friction as a girl goes down a slide. Identify the correct statement about friction.

 
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Question 7.
ch7c.jpg

Identify the correct statement about the air pressure on the aircraft wing, as shown in the diagram.

 
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Question 8.
Explain what you could do to help reduce the effects of friction on a surface.

 
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Question 9.
Sometimes friction is useful and necessary for the operation of a device. Identify the most useful example of friction on a bike.

 
End of Question 9


Question 10.
Identify the main difference between mass and weight.

 
End of Question 10


Question 11.
On Earth, you would need a force greater than 10 N to lift a 1 kg mass. Calculate the force needed to lift a 10 kg mass.

 
End of Question 11


Question 12.
Explain why a ship could sink.

 
End of Question 12


Question 13.
Recall the name of the force that prevents a boat from sinking in water.

 
End of Question 13


Question 14.
Due to cohesion, water has the tendency to form a 'skin' at its surface, allowing small organisms to move across the water without sinking. Recall the scientific name given to this 'skin'.

 
End of Question 14


Question 15.
The first magnets were simply lumps of rock that were naturally magnetic. These rocks contained a lot of iron. Name these rocks.

 
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Question 16.
The magnetic power of a bar magnet appears to be concentrated at certain points. Recall the name given to these points.

 
End of Question 16


Question 17.
Identify the metals magnets attract.

 
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Question 18.
ch7d.jpg

Identify what the blue lines in the diagram represent.

 
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Question 19.
ch7e.jpg

A magnet is placed onto a watch-glass as shown. If another magnet is held and moved to the right, predict the movement of the first magnet.

 
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Question 20.
ch7f.jpg

This diagram shows an iron nail floating on a piece of foam. The nail has been magnetised by stroking it with another magnet in one direction. Identify what the iron nail would do in this situation.

 
End of Question 20





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