Forces Flashcards

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1
Q

What is a force?

A

By definition, a force is a push OR pull, exerted by one object on another

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2
Q

Forces are measured in what?

A

Newtons, N.

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3
Q

There are different types of forces what do they depend on?

A

what objects are being affected by the push or pull.

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4
Q

What are the examples of forces?

A
  • Normal Reaction force
  • Applied force
  • Gravitational force
  • Electric force
  • Magnetic force
  • Nuclear force
  • Frictional force
  • Air resistance
  • Tension
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5
Q

There are four MAIN effects of a force name them:

A

(i) A FORCE CAN CHANGE AN OBJECT’S STATE OF MOTION (Since a force can cause a stationary object to start moving and a moving object to stop moving)
(ii) A FORCE CAN CHANGE THE SPEED OF AN OBJECT. (Can cause the object to reduce speed or increase speed, depending on the direction of the applied force.)
(iii) A FORCE CAN CAUSE A MOVING OBJECT TO CHANGE DIRECTION
(iv) A FORCE CAN CHANGE THE SHAPE AND SIZE OF AN OBJECT

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6
Q

What is a vector quantity?

A

(i) vector quantities - the quantity is fully described when both magnitude and direction are stated.
E.g. force, displacement, velocity, acceleration, momentum…etc

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7
Q

What is a scalar quantity?

A

ii) scalar quantities - the quantity is fully described when its magnitude only (numerical value) is stated. This means direction does not matter
E.g. time, mass, distance, speed, energy, area, volume…etc

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8
Q

How can vector quantities be rep?

A

Vector quantities can be represented in size and direction by an arrow, where the length of the arrow indicates the magnitude

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9
Q

Negative signs in vector quantities

A

Direction is taken into account by introducing a negative sign. The negative of a vector is a vector with the same magnitude but with opposite direction

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10
Q

the longer the line,…

A

the greater the magnitude of the quantity being measured.

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11
Q

Direction can be given with respect to an angle using trigonometry.

A

sin= opp/hyp
cos= adj/hyp
tan= opp/adj
this is multiplied by the angle (theta)

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12
Q

We use Pythagoras to find the hypotenuse or a missing side

A

a^2 + b^2 = c^2

side square + side squared = hypotenuse squared

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