WJEC Mechanics 1 - Key Facts

Frage	Antworten
Which SUVAT equation does not involve \(s\)?	\[v=u+at\]
Which SUVAT equation does not involve \(u\)?	\[s=vt-\frac{1}{2}at^2\]
Which SUVAT equation does not involve \(v\)?	\[s=ut+\frac{1}{2}at^2\]
Which SUVAT equation does not involve \(a\)?	\[s=\frac{1}{2}(u+v)t\]
Which SUVAT equation does not involve \(t\)?	\[v^2=u^2+2as\]
Which formula comes from Newton's Second Law?	\[F=ma\] Note: \(F\) represents the resultant force
Formula for the momentum of an object, mass \(m\), moving with velocity \(v\)?	\[mv\]
Formula for Impulse?	\[I=mv-mu\] or \[I=Ft\](this second formula is very rarely needed)
Area under a velocity-time graph gives...?	Displacement
Gradient of a velocity-time graph gives...?	Acceleration
Gradient of a displacement-time graph gives...?	Velocity
The SUVAT equations only work for constant _____________ ?	Acceleration
If an object is moving, or on the point of moving, what do we know about friction?	\[F_r=\mu R\]
If an object is in equilibrium and NOT on the point of moving, what do we know about friction?	\[F_r < \mu R\]
Formula for the coefficient of restitution, \(e\)?	\[e=\frac{v_2-v_1}{u_1-u_2}\]
Formula for the moment of a force about a point?	\[\text{Force}\times \text{distance}\] In this formula, 'distance' is the perpendicular distance from the line of action of the force to the point.
How would you find the centre of mass of a triangle?	Find the mean of the coordinates of the triangle's vertices OR \(\frac{2}{3}\) along median from vertex
Formula for the coefficient of restitution between an object and a plane surface (such as a wall or the ground)	\[e=\frac{\text{speed of rebound}}{\text{speed of approach}}\]
What is the principle of conservation of momentum?	Total momentum before impact equals total momentum after impact

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WJEC Mechanics 1 - Key Facts

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