newton´s laws and forces Flashcards

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1
Q

What is newton’s first law of motion

A

An object will remain at rest or move at a constant velocity unless acted upon by a resultant/net force.The object in motion continues in motion with same speed and in same direction unless acted upon by a non-zero resultant force.

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2
Q

What is the condition needed for constant velocity

A

The resultant force must be 0 for constant velocity, according to newton’s first law.

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3
Q

what does magnitude mean

A

size or quantity

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4
Q

what is newton’s third law of motion and what are the forces on each interacting object?

A

When two objects interact, they exert equal and opposite forces on each other.The forces acting on the interacting objects are always of the same type.

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5
Q

What happens when two electrons interact

A

Electrons have a negative charge, so they exert an electrostatic repulsive force on each other.The two electrons experience same magnitude of force but in opposite directions

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6
Q

What happens when a North and South pole in magnet interact

A

They exert magnetic forces on each other, same magnitude but opposite direction.

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7
Q

What happens when someone jumps off a building towards bottom

A

The force exxerted by the person on earth is their weight.The force exerted by earth on the person is gravitational force.Both forces have same magnitude, but opposite directions.

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8
Q

What are the 4 fundamental forces used to describe interactions

A

4 Types of fundamental forces:1. gravitational2. electromagnetic3. strong nuclear4. weak nuclear

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9
Q

What is the range of the nuclear forces

A

extremely short range

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10
Q

What force is exerted from pushing hands together

A

electrostatic repulsive forces between the electron clouds around the atomic nuclei in hands.

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11
Q

Explaing how newton’s laws can be used to explain how a person runs on a road

A

The runner exerts a backward force on the earth.According to newton’s third law the Earth exerts an equal Forward force on the person.

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12
Q

Define a newton

A

force required to accelerate a one-kilogram mass by one meter per second squared

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13
Q

What is newton´s 2nd law of motion

A

The resultant force on an object is equal to its rate of change of momentum

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