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23 Cards in this Set
- Front
- Back
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What assumptions do you make for a particle? |
Mass is concentrated at a single point. Rotational forces and air resistance can be ignored. |
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What assumptions do you make for a rod? |
Rigid, no thickness. |
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What assumptions do you make for lamina? |
Object has area but not thickness. Mass is distributed across a flat surface. |
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What assumptions do you make for a uniform body? |
The centre of mass is at the geometric centre of body. |
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What assumptions do you make for a light object? |
Treat object as having zero mass. |
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What assumptions do you make for an inextensible string? |
Acceleration is the same in both objects. |
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What assumptions do you make for a smooth surface? |
No friction. |
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What assumptions do you make for a rough surface? |
No friction. |
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What assumptions do you make for a wire? |
Treated as one dimensional. |
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What assumptions do you make for a smooth and light pulley? |
Pulley has no mass, tension is the same at both ends |
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What assumptions do you make for a beed? |
Moves freely along a wire or string. Tension is the same on either side. |
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What assumptions do you make for a peg? |
Dimensionless and fixed, can be rough or smooth. |
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What are unit vectors? |
i and j. i=(1,0) right. j is (0,1) up. |
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How do you derive suvat? |
Draw a velocity time graph starting at u and ending at v. The area under the graph is displacement. The gradient is acceleration. You then eliminate different variables to get the other suvats. |
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What is Newton’s First Law? |
An object will remain at rest or in uniform motion unless acted on by an external force. |
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What is Newton’s Second Law? |
The rate of change of momentum of an object is proportional to the resultant force on it. |
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What is Newton’s third law? |
For every action there is an equal and opposite reaction. |
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What is the maximum value of friction? |
F(max)=μR, Reaction to the slope. |
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What is true for a rigid body in static equilibrium? |
The body is stationary. The resultant force in any direction is zero. The resultant moment is zero. |
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What equations can you use when the velocity is constant? |
S=D/T, SUVAT and Calculus. |
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What equations can you use when acceleration is constant? |
SUVAT and Calculus. |
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What can you use when acceleration isn't constant. |
Calculus. |
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What changes when using Vectors in Kinematics? |
Displacement is denoted by r and the initial position is r₀. r=r₀ + vt. All of the suvats work the same way. |
