________ is all about the interaction between objects.
force
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Are forces that act between two objects that are physically touching each other.
contact forces
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Two objects sliding past each other experience ___________ forces.
friction
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An object moving through the air experiences ______ __________. For example, a skydiver falling through the air.
air resistance
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______________forces are forces that act between two objects that are not physically touching each other.
non-contact
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Examples of non-contact forces include:
Magnetic force, Electrostatic force, Gravitational force
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Like charges
repel
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opposite charges
attract
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Calculate the gravity force (weight) of a skydiver with a mass 70 kg falling towards the Earth? (Remember that gravitational field strength = 10 N/kg on Earth).
700 N
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The force that the Earth exerts on objects.
weight
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It is important to remember that weight is not the same as mass. The weight of a person of the same mass is larger on earth due to the
earth's stronger gravity
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If the force of gravity (weight) of a person on earth is 600 N, what will be his weight on the moon? Remember: The moon has 1/6 gravity of the earth.
100 N
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The ____________ is an instrument that is used to measure force.
spring balance
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The force of gravity (weight) ________________ as the mass increases. [increases or decreases]
increases
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What happens to your mass on the moon? [increases, remains the same, decreases]
remains the same
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The hair on our arms are attracted to the plastic wrap. What type of force is this?