Forces Flashcards

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1
Q

What is a force?

A

A force is an influence that causes an object to change. Gravity is an example of a force. Pushes and pulls are examples of forces but they are not the only ones.

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2
Q

Which force did Charles-Augustin de Coulomb first describe?

A

Charles-Augustin de Coulomb first described the electrostatic force. Isaac Newton first described gravity.

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3
Q

What does Newton’s First Law of Motion state?

A

Newton’s First Law states that objects with balanced forces acting on them will stay at rest or in constant motion. F = ma is an equation which summarises Newton’s Second Law.

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4
Q

What are the units of force?

A

The units of all forces are newtons. A bag of sugar has a gravitational force (weight) of 10 newtons.

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5
Q

Newton’s Second Law of Motion can be summarised by which equation?

A

Newton’s Second Law of Motion can be summarised as F = ma. It relates to unbalanced forces

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6
Q

What is friction?

A

Friction is a force that opposes motion. It acts when two or more surfaces slide past each other.

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7
Q

How do you calculate resultant force?

A

The resultant force is calculated by adding together all the forces that act upon an object. Dividing these forces will not give you a useful value.

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8
Q

What happens if the resultant force on a car is in the direction in which it is travelling?

A

If the resultant force on a car is in the same direction as the car is travelling it will speed up.

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9
Q

What is the gravitational field strength of the Moon?

A

The gravitational field strength of the Moon is 1.6 N/kg. 10 N/kg is the gravitational field strength of Earth.

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10
Q

If a person has a weight of 600 N, how much will they weigh on the Moon?

A

Weight is mass multiplied by gravitational field strength. A weight of 600 N is equivalent to a mass of 60 kg. So 60 kg x 1.6 N/kg is 96 newtons (N). 600 N is their weight on Earth

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