Physics GCSE > Forces > Flashcards

Forces Flashcards

(17 cards)

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1
Q

What is a force?

A

A force is a push or pull, these are vector quantities. They are measured in Newtons (N) using a Newton Meter.

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2
Q

Contact forces

A
  • friction
  • air resistance (drag)
  • upthrust
  • buoyancy
  • elastic
  • water resistance
  • thrust (driving force)
  • lift
  • tension
  • reaction/normal force
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3
Q

Non-contact forces

A
  • electrostatic
  • magnetic
  • weight (not gravity)
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4
Q

What is the normal force?

A

The normal force is the force between two surfaces to stop them passing through each other (eg. leaning on a wall, or standing on the floor).

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5
Q

Is gravity a force?

A

No, it is a concept.

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6
Q

Free body diagram rules

A
  • draw arrows using a pencil and a ruler
  • the head of the arrow shows the direction the force is acting in
  • the size of the arrow shows the magnitude (size) of the force
  • draw forces from the centre of the object, shown as a dot
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7
Q

Draw a free body force diagram of a dog running at a constant speed, labelling the forces.

A

N/a

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8
Q

Draw a free body force diagram of a car going up a ramp at a constant speed, labelling the forces.

A

N/a

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9
Q

What do balanced forces show?

A

Constant velocity

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10
Q

What do unbalanced forces show?

A

Acceleration

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11
Q

What is the resultant force?

A

The resultant force is the sum of all the forces acting on an object, it has both magnitude and direction.

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12
Q

How to find the resultant force?

A
  • add the forces acting in the same direction
  • take away the opposite forces
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13
Q

What is the resultant force of a balanced object?

A

0

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14
Q

What is the resultant force of a car driving 50N right and 60N left?

A

10N left

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15
Q

What is 1N equal to?

A

100g

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16
Q

What is a kilonewton or kN?

17
Q

What is tension?

Study These Flashcards
A

Tension is the name given to a force that acts through a stretched rope.

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