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Questions and Answers
What unit is used to measure force?
What unit is used to measure force?
- Pascals
- Kilograms
- Newtons (correct)
- Joules
Weight is measured in kilograms.
Weight is measured in kilograms.
False (B)
What is the formula to calculate weight?
What is the formula to calculate weight?
weight = mass x g
On Earth, 1 kilogram of matter weighs _____ N.
On Earth, 1 kilogram of matter weighs _____ N.
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Match the following types of forces with their definitions:
Match the following types of forces with their definitions:
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If an object has a mass of 50kg, what is its weight on Earth?
If an object has a mass of 50kg, what is its weight on Earth?
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What is the gravitational field strength on Earth?
What is the gravitational field strength on Earth?
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The force exerted by a jet engine can be measured as _____ N.
The force exerted by a jet engine can be measured as _____ N.
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Study Notes
Forces
- A force is a push or pull and is measured in newtons (N).
- A spring balance (newtonmeter) can be used to measure small forces.
- The greater the force, the further the spring is stretched.
Types of Forces
- Tension: The force in a stretched material.
- Weight: The downward pull of gravity.
- Friction: The force that resists motion between surfaces in contact.
- Air Resistance: A type of friction caused by air.
Gravitational Force
- The Earth exerts a downward pull on objects.
- This pull is called a gravitational force.
- All masses attract each other.
- The stronger the mass, the stronger the force.
- The closer the masses, the stronger the force.
Weight and Gravitational Field Strength
- Weight is the gravitational force from the Earth.
- Weight is measured in newtons (N).
- On Earth, each kilogram (kg) of matter weighs 10 N.
- The gravitational field strength on Earth is 10 N/kg, represented by g.
- The formula to calculate weight is: weight = mass x g
- Where g is 10 N/kg on Earth.
- For example, a person with a mass of 50kg weighs 500N (50kg x 10 N/kg).
Question 3
- The diagram should show a climber swinging on a rope, with three forces labelled:
- Tension: The upward force from the rope.
- Weight: The downward force due to gravity.
- Air Resistance: The force opposing the climber's movement through the air.
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