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ACCELERATION - فرز المجموعات

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Multiple Choice

What does the slope of a velocity-time graph indicate?

• Average speed

• Instantaneous speed

• Average acceleration

• Instantaneous acceleration

Multiple Choice

Calculate the acceleration for segment A.

• 2 m/s²
• 20 m/s²
• -2 m/s²
• 0 m/s²

Multiple Choice

What happens to an object's motion when the velocity is positive and the acceleration is negative?

• The object slows down.
• The object speeds up.
• The object remains at a constant velocity.
• The object remains at rest.

Multiple Choice

What happens when the velocity vector and the acceleration vector of an object in motion are in the same direction?

• The acceleration of the object increases.

• The speed of the object increases.

• The object comes to rest.

• The speed of the object decreases.

Multiple Choice

Consider the graph shown below. Which description below is consistent with the graph?

• The object moves slowly at a constant speed and then faster at a constant speed.

• The object accelerates in the positive direction and then accelerates more rapidly.

• The object moves forward, changes direction and then accelerates more rapidly.

Multiple Choice

What is the total displacement of the object represented in this motion graph?

• 5 meters
• 4 meters
• 2 meters
• 0 meters

Multiple Choice

Rearrange the equation for velocity with constant acceleration to solve for time. What is the equation?

• tf = (vf - vi) / a

• tf = vi + aΔt

• tf = vf + aΔt

• tf = vi - aΔt

Multiple Choice

Woody and Buzz falls from the sky with an initial velocity of 0, experiencing an acceleration of 9.8 m/s². If he covers a displacement of 50 meters, what is his final velocity?

Which equation should you use?

• $$v_f=v_i+at$$

• $$\Delta x=v_it+\frac{1}{2}at^2$$

• $$v_f^2=v_i^2+2a\Delta x$$

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Multiple Choice

What is free-fall?

• The motion of an object when gravity is the only significant force acting on it.

• The motion of an object when air resistance is negligible.

• The motion of an object when it is thrown upwards.

• The motion of an object in a vacuum.

Multiple Choice

If you throw a baseball straight up, what is its vertical velocity at the highest point?

• 9.8 m/s²

• 9.8 m/s

• 0 m/s²

• 0 m/s

Multiple Choice

What would happen if the ball's acceleration at the top of its flight were also zero?

• The ball would gain downward velocity

• The ball would hover in the air

• The ball would fall immediately

• The ball would accelerate upward

Multiple Choice

A textbook is dropped from a second floor window and falls to the ground. What happens to the acceleration as the book falls to the ground

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

Multiple Choice

This graph shows the vertical velocity of an object that has been thrown in the air. The acceleration of this object is..

• constant -10 m/s/s

• increasing

• decreasing

• remaining zero