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Questions and Answers
Which one of these is an example of a contact force?
Which one of these is an example of a contact force?
- Electromagnetic force
- Nuclear force
- Frictional force (correct)
- Gravitational force
When a body slides or rolls over a rough surface, a force starts acting on the body in a direction opposite to the motion of the body. What is this force called?
When a body slides or rolls over a rough surface, a force starts acting on the body in a direction opposite to the motion of the body. What is this force called?
- Gravitational force
- Frictional force (correct)
- Electromagnetic force
- Normal reaction force
What force resists the motion of a book on a table top when it tends to move?
What force resists the motion of a book on a table top when it tends to move?
- Normal reaction force
- Electromagnetic force
- Frictional force (correct)
- Gravitational force
Which one of these is an example of a contact force?
Which one of these is an example of a contact force?
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When does the force of friction come into play?
When does the force of friction come into play?
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What is the direction of the force of friction when a book placed on a table top is pushed to the right?
What is the direction of the force of friction when a book placed on a table top is pushed to the right?
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Study Notes
Contact Forces
- A force that acts on a body in a direction opposite to its motion when it slides or rolls over a rough surface is an example of a contact force.
Friction
- Friction is the force that resists the motion of a book on a table top when it tends to move.
- Friction comes into play when there is motion or tendency of motion between two surfaces in contact.
- When a book is placed on a table top and pushed to the right, the direction of the force of friction is to the left, opposing the motion.
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