4.2: Contact Forces

QuizÂ by Macie Morris

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10 questions
• Q1
What is the contact force that opposes motion between two surfaces?
Frictional force
Normal force
Tension force
Gravitational force
30s
• Q2
What is the contact force exerted by a stretched or compressed object?
Gravitational force
Elastic force
Frictional force
Normal force
30s
• Q3
Which contact force arises between two objects in contact and depends on the roughness of their surfaces?
Normal force
Electromagnetic force
Frictional force
Gravitational force
30s
• Q4
What is the SI unit of force?
Joule
Newton
Ampere
Watt
30s
• Q5
Which of the following factors does NOT affect frictional force?
surface roughness
temperature
type of material
weight of an object
30s
• Q6
Which of the following statements about frictional force is true?
Frictional force has no effect on motion
Frictional force sometimes opposes motion
Frictional force always opposes motion
Frictional force always increases motion
30s
• Q7
Which of the following surfaces would generally have a higher coefficient of friction?
smooth surface
rough surface
oily surface
wet surface
30s
• Q8
Which of the following statements is true about elastic force?
Elastic force only acts on solid objects.
Elastic force is always in the opposite direction of the displacement.
Elastic force restores an object to its original shape or position.
Elastic force causes objects to permanently deform.
30s
• Q9
Which of the following is an example of a contact force?
Friction
Magnetism
Electricity
Gravity
30s
• Q10
What is the relationship between force and motion?
Motion causes force
Force and motion are interchangeable
Force and motion are unrelated
Force causes motion
30s

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