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Physics > 4.1 - Mechanics > Flashcards

4.1 - Mechanics Flashcards

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1
Q

What is meant by a scalar quantity?

A

A quantity with only magnitude

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2
Q

What is a vector quantity?

A

A quantity that has magnitude and direction

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3
Q

Is acceleration a vector or scalar quantity?

A

Vector

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4
Q

Is mass a scalar or vector quantity?

A

Scalar

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5
Q

What is the difference between mass and weight?

A

Mass is a scalar and not dependent on the gravity acting upon it. Weight is a vector and depends on the gravitational field strength.
W =mg

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6
Q

If and object is in equilibrium the sum of the anticlockwise moments would be equal to what?

A

The sum of the clockwise moments

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7
Q

If an object is in equilibrium it mean the object is what?

A

Not accelerating so it is either stationary or at a constant velocity

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8
Q

How can forces acting on an object be shown to be in equilibrium?

A

1) Adding the horizontal and vertical components of force acting on it showing they equal 0
2) Or if 3 forces are acting on an object you can draw a force diagram and if it forms a closed circle the object is in equilibrium

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9
Q

What is a moment?

A

A turning force : force multiplied by the perpendicular distance from the point to the line of action of the force

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10
Q

What is meant by a couple?

A

A pair of equal and opposite coplanar forces

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11
Q

What is meant by the centre of mass?

A

The point through which all of the mass of an object acts, for a uniform object the centre of mass is in the centre of the object

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12
Q

What can be described as the change in displacement per unit time?

A

Velocity

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13
Q

What is the area under a velocity-time graph and an acceleration-time graph?

A

The displacement travelled and the velocity respectfully

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14
Q

As speed increases air-resistance does what?

A

Increases proportional to the square of the velocity

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15
Q

A ball projected from the top of a castle at a speed of 6m/s , how does its horizontal velocity change from then until it hits the ground

A

Horizontal velocity stays the same as there is no acceleration in that direction

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16
Q

How do the SUVAT equations reflect that all objects fall at the same rate?

A

There is no mass in the SUVAT equations , showing the mass of an object does not affect its velocity or acceleration

17
Q

In projectile motion what is the vertical aceleration?

A

the vertical acceleration is equal to the gravitational field strength

18
Q

What is meant by terminal velocity?

A

When the forces acting on a falling object become balanced, the acceleration becomes 0 and the object is moving at a maximum velocity

19
Q

What is meant by friction?

A

The resistance to motion between an object and a surface or an object moving through a fluid. Friction is a force that acts the opposite direction to motion

20
Q

Which of Newton’s laws state every action force has an equal and opposite reaction force?

A

3rd law

21
Q

What is Newton’s second law?

A

F=ma or F= (mv-mu)/t

Rate of change of momentum

22
Q

What is Newtons thirst law?

A

An object remains at a constant velocity if no external forces are acting on it

23
Q

What is the difference between elastic and inelastic collisions?

A

Elastic conserves kinetic energy and momentum

Inelastic does not conserve kinetic energy but does conserve momentum

24
Q

Give an equation that can be used to work out momentum

A 
P = mxv 
Momentum = mass x velocity 
P= F x t 
Momentum = Force x time
25
Q

True or False: linear momentum is only conserved in elastic collisions?

A

False , linear momentum is always conserved

26
Q

What is Impulse ?

A

Change in momentum

Ft = mv

27
Q

What does the area under a force time graph represent?

A

Impulse

28
Q

Fscos(X) =?

A

work done/ energy transferred

29
Q

What’s the rate of work done is equal to?

A

The power

30
Q

What is efficiency ?

A

useful output power / input power

31
Q

What is meant by the principle of conservation of energy?

A

Energy cannot be created or destroyed only transferred into other forms of energy

32
Q

What is lift?

A

An upward force that acts on an object travelling in fluid , it is created by the object causing a change in the direction of fluid flow and acts perpendicular to the direction of fluid flow

Physics (17 decks)

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