Kinematics_Free Fall & Projectile Motion

Kinematics_Free Fall & Projectile Motion

by Irvani Prasanti

Multiple Choice

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

• the velocity increases

• the velocity decreases

• the velocity remain constant

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

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

• the feather

• the metal bolt

• They would hit the ground at the same time.

• They would be suspended in a vacuum.

Multiple Choice

If air resistance is ignored, the distance that a freely falling body in equal time intervals of 1 s _________________

• increases as it falls

• decreases as it falls

• remains the same

• depends on the mass of the body

Multiple Choice

Which of the dot diagrams best describe the motion of a free-falling object that is dropped from rest?

• Diagram A

• Diagram B

• Diagram C

Multiple Choice

Air friction (Air Drag) against a skydiver

• acts upward

• increases with increased surface area

• increases with increased speed

• all of these

Multiple Choice

Just after she jumps out of the plane (before the parachute opens). The relative forces will be

• Weight force is equal to the friction force

• Friction force is constant

• Weight force is greater that the friction force

• Friction force is greater than the weight force

Multiple Choice

After the 60 seconds, the parachutist pulls the cord and opens her parachute.

Explain how the parachute reduces the speed of the parachutist when it is just opened.

• The friction force decreases

• The weight force decreases

• The weight force increases

• The friction force increases

Multiple Select

Identify true statements:

You can choose more than 1.

• The parachutist has just left the plane

• Weight is increasing

• There is no drag

• Weight is constant

• Deceleration

Multiple Select

Identify true statements:

You can choose more than 1.

• Drag is increasing

• Velocity is increasing

• There is no drag

• Weight is increasing

• Deceleration

Multiple Select

Identify true statements:

You can choose more than 1.

• Drag is increasing

• Velocity is increasing

• Terminal velocity

• Acceleration

• Maximum drag

Multiple Select

Identify true statements:

You can choose more than 1.

• The parachutist opens their parachute

• Deceleration

• Terminal velocity

• Weight is increasing

• Drag is constant

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​HORIZONTAL PROJECTILE MOTION

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Multiple Choice

The initial horizontal velocity of a projectile is ____ its final horizontal velocity.

• less than

• equal to

• greater than

Multiple Choice

What is true about the vertical velocity of a projectile launched horizontally?

• It is initially at its maximum value.

• It increases due to gravity as it falls.

• It remains constant throughout its trajectory.

• It decreases as it falls due to gravity.

Multiple Choice

In a projectile motion we always have...

• 1 component (x)

• 3 components (x,y, and z)

• 2 components (x and y)

• 0 components

Multiple Choice

A soccer ball is kicked with a 36 degree angle and a velocity of 23 m/s. Find the horizontal component of the balls velocity.

• 13.5 m/s

• 14.1 m/s

• 18.6 m/s

• 33.1 m/s

Multiple Choice

In the picture, cannonball A was launched at 10 m/s at 60°, and B was launched at 18 m/s at 25°. The cannonball that hit the ground first was

• A, because it had less total velocity.

• B, because it had more total velocity.

• A, because it had less initial vertical velocity.

• B, because it had less initial vertical velocity.

Multiple Choice

At what point is v_y= 0 m/s?

• A

• B

• C

• D

• None of these points

Multiple Choice

At what point is v_x= 0 m/s?

• A

• B

• C

• D

• None of these points

Multiple Choice

A skateboarder rolls off a bridge into the river as shown. If the skateboarder was originally moving at 7.0 m/s, how much time did the skateboarder spend in the air?

• 1.3 s

• 0.79 s

• 38.5 s

• 0.70 s

• Not enough information given.

Multiple Choice

A skateboarder rolls off a bridge into the river as shown. If the skateboarder spent 0.79 s in the air, how far above the river is the edge of the bridge?

• 5.5 m

• 0.70 m

• 1.3 m

• 3.1 m

• Not enough information given.

Multiple Choice

A ball rolls off a table and strikes the floor, as shown. If the time the ball spent in the air was 0.58 s, how fast did the ball leave the table?

• 3.6 m/s

• 1.2 m/s

• 2.9 m/s

• 0.99 m/s

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