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SocraticPhysics > 3. Newton's laws > Flashcards

3. Newton's laws Flashcards

1
Q

What are the contact forces?

A

Push or pull.

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2
Q

What does push or pull require?

A

Touch.

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3
Q

Which type of force does not require touch?

A

Field force.

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4
Q

What is an example of a field force?

A

Gravity or electric fields.

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5
Q

What is Newton’s first law?

A

An object will stay at rest until acted upon by an unbalanced force. An object will stay in motion until acted upon by an unbalanced force.

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6
Q

What is Newton’s first law also known as?

A

The law of inertia.

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7
Q

What gives an object more inertia?

A

More mass - this makes it harder to change its motion.

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8
Q

What type of diagrams show the forces acting on an object?

A

Free Body Diagrams.

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9
Q

What is Newton’s second law?

A

The net force that acts on an object is directly proportional to the object’s mass and acceleration.

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10
Q

What is the formula for Newton’s second law?

A

F=MA

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11
Q

What can a net force do to an object?

A

Increase or decrease an object’s speed, or change its direction.

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12
Q

What does Newton’s third law state?

A

For every action force there is an equal and opposite reaction force.

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13
Q

What is normal force?

A

Normal force is the contact force that surfaces exert to prevent solid objects from passing through each other.

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14
Q

How do normal forces usually act?

A

Perpendicular to the surface.

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15
Q

What is friction?

A

A force that resists motion of objects past each other.

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16
Q

What is the force of friction directly proportional to?

A

The coefficient of friction and the normal force.

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17
Q

What are the two types of friction?

A

Static (stationary) and kinetic (sliding).

18
Q

What is static friction?

A

A force that prevents objects from sliding past each other.

19
Q

What is kinetic friction?

A

A force that slows down objects that are already sliding past each other.

20
Q

What is weight?

A

An object’s weight is the force it experiences due to gravity.

21
Q

Are mass and weight the same thing?

A

No. Mass is measured in kilograms, while weight is measured in newtons.

22
Q

What is net force?

A

The vector sum of all the forces acting on an object.

23
Q

What is tension?

A

The force that a rope, chain or string exerts as it pulls on an object.

24
Q

Tension is the same throughout the rope if the rope is what?

A

Massless.

25
Q

Tension is the same throughout the rope if it is hung over a massless, frictionless what?

A

Pulley.

26
Q

A magician suddenly jerks a tablecloth out from under the dishes on a table. This best demonstrates what?

A

That dishes have inertia.

27
Q

What causes a falling sky diver to slow down after the parachute opens?

A

Air resistance.

28
Q

What is the speed of a car that travels 200 meters in 25 seconds?

A

8 m/s

29
Q

If an object is moving with a velocity of 24 m/s and has an acceleration of −4 m/s2, how long will it take it to stop?

A

6 seconds.

30
Q

A car accelerates from 15 m/s to 30 m/s in 3.0 s. What is the car’s acceleration?

A

5 m/s2

31
Q

Acceleration refers to which of these? .

  • increasing speed
  • decreasing speed
  • changing direction
A

All of them.

32
Q

An object traveling 20 m/s accelerates 5 m/s2 for 12 seconds. What is its final velocity?

A

80 m/s

33
Q

A car travels 110 km North, turns around and then travels another 80 km South. The final displacement of the car is what?

A

30 km.

34
Q

How much force does an object with a mass of 100 kg need to accelerate at 18 m/s2?

A

1800N

35
Q

Explain the normal force. Give an example as part of your explanation.

A

The normal force is the contact force, exerted perpendicular to the contact surface, on an object by, for example, the surface of a floor or wall, preventing the object from penetrating that surface.

36
Q

Given a force diagram like the one shown, if the object is not moving, what do you know about the forces at A and B?

A
37
Q
A
38
Q
A
39
Q
A
40
Q
A

SocraticPhysics (18 decks)

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