Topic 2: Mechanics Flashcards

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1
Q

When can you use SUVAT equations?

A

When an object is moving at uniform acceleration

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2
Q

What is velocity?

A

Rate of change of displacement

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3
Q

What is acceleration?

A

Rate of change of velocity

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4
Q

What is uniform acceleration?

A

Uniform acceleration is when acceleration of an object is constant.

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5
Q

What does acceleration-time graph area show?

A

Area under shows change in velocity

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6
Q

What does velocity-time graph gradient/area show?

A

Gradient shows acceleration
Area shows displacement

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7
Q

What does displacement-time graph gradient show?

A

Gradient shows velocity

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8
Q

What is a scalar/vector quantity?

A

Scalar quantity only has a magnitude
Vector quantity has a magnitude and direction

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9
Q

How to resolve a vector?

A

TO resolve vector;
split vector into horizontal/vertical component

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10
Q

How to add vectors?

A

Position vectors in tip-to-tail
Use trig

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11
Q

How are projectile motion different to usual vectors?

A

Horizontal/vertical components are separate. Use different
Horizontal acceleration always 0.

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12
Q

What is a free-body force diagram?

A

Diagram which shows all forces that act on an object

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13
Q

What is newtons 1st law?

A

Newtons first law states that an object remains stationary or moves at a constant velocity unless a resultant force is experinced

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14
Q

What is Newton’s 2nd law?

A

Acceleration of an object ∝ resultant force

F = ma

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15
Q

What is terminal velocity?

A

Terminal velocity is when driving forces and resistive forces are equal. No acceleration; constant velocity

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16
Q

What is gravitational field strength?

A

Force per unit mass exerted by a gravitational field on an object

17
Q

What is weight?

A

Weight is the gravitational force that acts due to an object’s weight

18
Q

What is Newton’s 3rd Law?

A

Newton’s 3rd law states for each force experienced by an object, the object exerts an equal and opposite force.

19
Q

What is momentum?

A

Products of mass and velocity

20
Q

What does conservation of momentum state?

A

Momentum is always conserved in any interaction where no external forces act.
p before = p after

21
Q

What is a moment of a force?

A

Force multiplied by perpendicular distance from line of action of the force to the point.

22
Q

What does equilibrium in moments mean?

A

Moments CW = moments ACW

23
Q

What is the centre of gravity in moments?

A

The point at which gravity appears to act

24
Q

Where is the centre of gravity in uniform objects?

A

Centre

25
Q

What is work done?

A

Force causing motion multiplied by distance travelled in direction of motion

26
Q

What is kinetic energy?

A

Kinetic energy is energy that an object has due to its motion.

27
Q

What is gravitational potential energy?

A

GPE is energy object has due to its position in gravitational field.

28
Q

What does conservation of energy state?

A

Energy cannot be destroyed or created but transferred from one form to another.
Total energy in = total energy out

29
Q

What is power?

A

Power is the rate of energy transfer

30
Q

What is efficiency?

A

Measure of how efficiently a system transfers energy.