Acceleration and Kinematic Equations

Which equation correctly describes the acceleration?

•  $a\ =\ \frac{v}{t}$  

•  $a\ =\ \frac{change\ in\ velocity}{time}$  

•  $a\ =\ \frac{v+u}{2t}$  

•  $a=\frac{average\ velocity}{time}$  

Which of the following gives the units of acceleration?

• $m\ s^2$

• $m\ s^{-2}$

• $m\ s$

• $m\ s^{-1}$

The direction of the acceleration is the same as the direction of ...

• ... the change in velocity.

• ... the velocity.

• ... the displacement.

• ... the direction of motion.

What must be true for the kinematic equations to apply?

• The acceleration must be constant.

• The acceleration must be zero.

• The acceleration must be positive.

• The acceleration must be negative.

In the kinematic equations, what does

 $u$  represent?

• initial velocity

• final velocity

• displacement

• acceleration

If you are given the initial velocity, acceleration, and time, and you want to solve for the final velocity, which kinematic equation should you use?

• $v\ =\ u\ +\ at$

• $s\ =\ ut\ +\ \frac{1}{2}at^2$

• $v^2=u^2+2as$

• $s=\frac{u+v}{2}t$