Motion and Freefall

If air resistance is negligible, which object will hit the ground first if dropped at the same time: Bowling ball or Feather?

• bowling ball

• Feather

• Both with hit the ground at the same time

• They will not fall without air resistance

As an object is thrown up, If up is considered positive and down is considered negative, what is the direction of the velocity and acceleration of the object as the object travels up?

• Velocity: + Acceleration: -

• Velocity: + Acceleration: -

• Velocity: - Acceleration: +

• Velocity: - Acceleration: -

As an object is thrown up, If up is considered positive and down is considered negative, what is the direction of the velocity and acceleration of the object at its highest point

• Velocity: 0 Acceleration: 0

• Velocity: 0 Acceleration: -

• Velocity: 0 Acceleration: +

• Velocity: - Acceleration: 0

As an object is thrown up, If up is considered positive and down is considered negative, what is the direction of the velocity and acceleration on its way down

• Velocity: + Acceleration: -

• Velocity: + Acceleration: +

• Velocity: - Acceleration: +

• Velocity: - Acceleration: -

An apple falls out of a tree to the ground. The apple starts at rest and takes .54 seconds to fall to ground. Which of the following variables are unknown after reading this problem?

• Initial Velocity

• time

• acceleration

• Final Velocity

A car accelerated from rest at 4 m/s². The car takes 1.2 seconds to reach 10 m/s. Which of the following variables is unknown after reading the problem?

• Displacement

• acceleration

• time

• Final Velocity

A dog chases after a car at 4 m/s. Eventually the dog gets tired and begins to slow down. It takes it 3 seconds to slow to 1.5 m/s. In the problem, the 1.5 m/s most likely represents

• Final Velocity

• Initial Velocity

• time

• Acceleration

A dog chases after a car at 4 m/s. Eventually the dog gets tired and begins to slow down. It takes it 3 seconds to slow to 1.5 m/s. In the problem, the 4 m/s most likely represents

• Final Velocity

• Initial Velocity

• time

• Acceleration

A dog chases after a car at 4 m/s. Eventually the dog gets tired and begins to slow down. It takes it 3 seconds to slow to 1.5 m/s. In the problem, the 3 seconds most likely represents

• Final Velocity

• Initial Velocity

• time

• Acceleration

An baseball is thrown straight up into the air at 5 m/s. If you wanted to determine how long it took the ball to reach its highest point, which equation could you use?

• $v_{avg}=\frac{\Delta x}{\Delta t}$

• $v_f=v_i+a\Delta t$

• $\Delta x=v_i\Delta t+\frac{1}{2}a\left(\Delta t\right)^2$

• $v_f^2=v_i^2+2a\Delta x$