7K — Forces Flashcards

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1
Q

What is the unit for measuring:

1) Force
2) Mass
3) Weight

A

1) Newtons (N)
2) Kilograms (Kg)
3) Newtons (N)

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2
Q

1) Define mass.

2) Define weight.

A

1) Mass is the amount of matter that something is made from.

2) Weight is the amount of force with which gravity pulls things.

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3
Q

What is a force?

A

A force is a push or pull.

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4
Q

What is friction?

A

Friction is a force caused by two things rubbing together.

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5
Q

1) What is a contact force?

2) What is a non-contact force?

A

1) A contact force is a force that only acts when two objects are touching.
2) A non-contact force is a force that can have an effect without objects touching.

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6
Q

What happens when a force is applied to an elastic material?

A

Elastic materials will stretch with a force and then return to their original shape when the force is taken away.

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7
Q

1) What is Hooke’s Law?

2) What is an elastic limit?

A

1) Hooke’s Law is the law that says the extension of a spring is proportional to the force on it.
2) The elastic limit is how far a spring can be stretched before it is permanently stretched and no longer elastic.

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8
Q

1) Examples of contact forces

2) Examples of non-contact forces

A
1) — Friction
— Air resistance
— Water resistance
— Upthrust
2) — Magnetism
— Gravity
— Static electricity
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