WJEC Mechanics 1 - Key Facts

Question	Answer
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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	Created by Daniel Cox almost 9 years ago