P8

What is displacement?
Distance without change of direction
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What is a vector?
Physical quantities that have a direction
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What are some examples of vectors?
Acceleration, force, momentum, weight and gfs
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What are scalars?
Physical quantities that have size but no direction
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What are some examples of scalars?
Speed, distance, time, mass, energy and power
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What is magnitude?
The size of a quantity
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The length of a force arrow represents what?
Magnitude of vector quantity
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What can a force change?
Shape of an object or its state of rest or its motion
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What is a force?
A push or pull that acts on an object
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What is a contact force?
Only acts when objects touch
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What are examples of contact forces?
Friction, resistance
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What are examples of non contact forces?
Magnetic, electrostatic, gravity
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What does Newton's third law of motion state?
When two objects interact they exert equal and opposite forces on one another
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What force makes a car move?
Driving force
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When a car moves forward what happens?
Force of friction of road on tyre in forward direction and force of friction of tyre on road in reverse
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What is the resultant force?
The single force that has the same effect as all the forces acting on the object
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What does Newton's first law of motion state?
If the forces acting on an object are balanced the resultant force is 0
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What else does the law state?
Object at rest=stationary, if an object is moving it keeps moving with the same speed in the same direction
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What happens to the resultant force when an object is acted on by two unequal forces acting in opposite directions?
It is equal to difference between the two and in the direction of larger force
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What is the weight of an object called?
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What is the force someone applies called?
Effort
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How to work out moment of a force?
Force x perpendicular distance
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What does a low gear give?
Low speed and high turning effect
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What does a high gear give?
High speed and a low turning effect
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What is the centre of mass?
Is the point at which its mass can be thought of as being concentarted
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What does freely suspended mean?
It returns to equilibrium
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For an object turning what happens?
The sum of clockwise movements = anticlockwise movements
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What is used to find resultant force of two forces not in same direction?
Parallelogram of forces
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What are the key conditions for a force to be in equilibrium?
Resultant force is 0 and forces have no turning effect
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Other cards in this set

Card 2

Front

What is a vector?

Back

Physical quantities that have a direction

Card 3

Front

What are some examples of vectors?

Card 4

Front

What are scalars?

Card 5

Front

What are some examples of scalars?