2. 1D Motion / Kinematics

If a car on a frictionless track is pulled by a string with two washers attached (each washer providing the same force $F$), how does the acceleration $a$ of the car compare to when only one washer is used?

A girl pulls on a $10\mathrm{kg}$ wagon with a constant force of $20N$. What is the wagon's acceleration?

If an object's mass $m$ decreases while a constant force $F$ acts on it, the acceleration $a$:

Under which of the following conditions is acceleration considered $\mathrm{negative}$?

A motorcycle moves along a straight road. Its velocity at each second is recorded as follows: at $t=0s$, $v=0m/s$; at $t=1s$, $v=2m/s$; at $t=2s$, $v=4m/s$; at $t=3s$, $v=4m/s$; at $t=4s$, $v=6m/s$. At which second does the motorcycle first start to have positive acceleration?

Which of the following objects has zero $a$?

An object initially at rest reaches a velocity of $20m/s$ in $4s$. What is the magnitude of the acceleration?

An electric vehicle starts from rest and accelerates at a constant rate of $a$ for a time $t$. What is the final speed of the vehicle after time $t$?

In the context of motion, what is another term commonly used for $\mathrm{negative} \mathrm{acceleration}$?

Which statement is true about an object with an acceleration of $6\frac{m}{s^2}$?

A car starts from rest and accelerates uniformly to a speed of $60 \mathrm{mph}$ in $10 s$. What is the required constant acceleration in SI units $m/s^2$?

Which of the following describes an object with $a=0$?

If the change in velocity of an object ($\mathrm{\Delta v}$) increases while the time interval ($\mathrm{\Delta t}$) remains constant, what happens to the acceleration ($a$) of the object?

A cheetah can accelerate from rest to a speed of $30.0m/s$ in $7.00s$. What is its acceleration?

A car accelerates from an initial speed of $20\text{m/s}$ to a final speed of $26\text{m/s}$ at a constant acceleration of $1.4\text{m/s}{2}^{}$. How much time does it take for the car to reach this final speed?