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Questions and Answers
How is one newton defined?
How is one newton defined?
- The force required to hold a mass of 1 kg at rest
- The force of gravity on a 1 kg mass
- The force required to increase the speed of a 1 kg mass by 1 m/s in one second (correct)
- The force required to accelerate a 1 kg mass by 10 m/s²
What is the SI unit of force?
What is the SI unit of force?
- Newton (correct)
- Joule
- Watt
- Pascal
What term is used to describe the axis through a pivot point about which a body turns?
What term is used to describe the axis through a pivot point about which a body turns?
- Axis of revolution
- Axis of inertia
- Axis of symmetry
- Axis of rotation (correct)
In the context of force, what happens when a stationary rigid body is acted upon by a force?
In the context of force, what happens when a stationary rigid body is acted upon by a force?
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Which scenario best describes the turning effect of a force?
Which scenario best describes the turning effect of a force?
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What happens when the handle of a door is either pushed or pulled?
What happens when the handle of a door is either pushed or pulled?
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Study Notes
Unit of Force
- The SI unit of force is the newton (N).
- The unit is named after Sir Isaac Newton, an English scientist who researched force.
- One newton is the force that increases the speed of a 1 kg object by 1 m/s when applied in the direction of its motion.
Turning Effect of a Force
- When a force is applied to a stationary rigid body, it moves in a straight line in the direction of the force.
- If the body is pivoted at a point and a force is applied, it rotates about that point, known as the axis of rotation.
- Examples of turning effect include:
- A wheel turning about its pivoted point when pushed or pulled.
- A door turning about its hinges when the handle is pushed or pulled.
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