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GCSE PPaper2 > Forces (5) - Pt1 > Flashcards

Forces (5) - Pt1 Flashcards

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1
Q

What are vectors?

A

Vector quantities have magnitude and direction

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2
Q

Give examples of 5 vector quantities

A 
Dates are mostly for Vigins
Displacement
Acceleration 
Momentum 
Force
Velocity
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3
Q

What are scalar quantities?

A

Only have magnitude no direction

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4
Q

Give 5 examples of scalar quantities

A 
MighTy STanD
Mass
Temperature 
Speed
Time
Distance
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5
Q

What’s a force?

A

It’s a push or pull on an object that’s caused by it interacting with something
All forces are contract or non-contract

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6
Q

What’s a contact force and give 4 examples?

A

When 2 objects have to be touching for the force to act

Friction, air resistance, tension and normal contact force.

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7
Q

What a non-contact force and give 3 examples?

A

Objects that don’t need to be touching for the force to act
Magnetic force
Gravitational force
Electrostatic force

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8
Q

What’s an interaction pair?

A

Forces that are equal and opposite that act on 2 interacting objects

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9
Q

What 2 effects does gravity have?

A
  • gives everything weight

- on the surface if a planter it makes everything fall to the ground

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10
Q

What’s weight?

A
  • Weight is the force acting on an object due to gravity.
  • The force of gravity close to the Earth is due to the gravitational field around the Earth.
  • The weight of an object depends on the gravitational field strength at the point where the object is.
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11
Q

What’s the formula to find weight?

A

Weight (N) = Mass (kg) x gravitational field strength (N/Kg)

W = Mg

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12
Q

What’s the relationship between mass and weight?

A

They’re directly proportional

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13
Q

What’s the approximate gravitational field strength for earth?

A

9.8 N/Kg

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14
Q

What’s the centre of mass of an object?

A
  • A point where you can assume the whole mass is concentrated
  • where the weight of an object may be considered to act at a single point
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15
Q

Is mass a force?

A

No

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16
Q

What in weight measured with?

A

using a calibrated spring-balance (a newton meter)

17
Q

What’s a resultant force?

A

If you had a number of forces acting on a single point they can be replaced by a single force (resultant force)

18
Q

What’s the formula to find work done?

A 
Work done (J) = Force (N) x Distance (m)
W=Fs
19
Q

Explain the equation W=Fs

A
  • a force causes an object to move a certain distance
  • so work is done on the object.
  • So a force does work on an object when the force causes a displacement of the object.
20
Q

What’s the conversion of joules to newton meters?

A

1J = 1Nm

21
Q

In terms of forces and energy what happens when you push something along a rough surface?

A
  • you’re doing work against frictional forces
  • energy is transferred to kinetic energy stores as the object moves
  • but some is also transferred to thermal energy stores due to friction
  • causing the overall temperature to increase
22
Q

What does it mean if an object is at equilibrium?

A

If All of the forces acting on the object combine to give a resultant of zero then the object is at equilibrium

23
Q

What does it mean if an object is elastically deformed?

A

It can go back to its original shape and length once the force has been removed.
These objects are called elastic objects

24
Q

What does it mean if an object is inelastically deformed?

A

If It doesn’t return to its original shape or length after the force has been removed

25
Q

When you Appleby a force to an object what 3 things can happen to it?

A

You may cause it to: stretch, compress or bend

26
Q

Why do you need more then one force on a stationary object to compress, stretch or bend it?

A

Otherwise the object would simply move in the direction of the applied force, instead of changing shape

27
Q

It terms of energy stores what happens to an object when it’s stretched or compressed?

A
  • work is done causing energy to be transferred to the elastic potential energy stores of the object
  • if it’s elastically deformed all the energy is transferred to the objects potential energy stores
28
Q

What’s the relationship between the force on a stretched spring and the extension stretched spring?

A

Directly proportional

29
Q

What’s the equation for finding the force applied to a spring?

A

Force (N) = spring constant (N/m) x Extension (m)

F=Ke

30
Q

How would you change F=Ke for an object being compressed?

A

e becomes the difference between the lengths of the neutral spring and the compressed spring

GCSE PPaper2 (10 decks)

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