Unit 01 - Kinematics and Motion

. A rock is thrown straight up from the edge of a cliff. The rock reaches the maximum height of 15 m above the edge and then falls down to the bottom of the cliff 35 m below the cliff. What is the displacement of the rock?

• A. 15 m

• B. 35 m

• C. 50 m

• D. 65 m

A car accelerates from rest at a constant rate 5 m/s2 . Which of the following statements is true?

• A. The car travels 5 m in every second

• B. The car decreases its velocity 5 m/s in every second

• C. The car increases its velocity 5 m/s in every second

• D. The car’s velocity doesn’t change

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A student drops a pebble from the edge of a vertical cliff. The pebble hits the ground 4 s after it was dropped. What is the speed of the pebble just before it hits the ground?

• A. 20 m/s

• B. 40 m/s

• C. 60 m/s

• D. 80 m/s

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A marble launcher shoots a marble horizontally from the height of 0.2 m above a horizontal floor. The marble lands on the floor 5 m away from the launcher. How long did the marble stay in the air?

• 0.1s

• 0.2s

• 0.3s

• 0.4s

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A tennis ball is dropped from a roof 16 meters from the ground. How long does it take for the ball to reach the ground?

• 1.8

• 2.6

• 1.4

• 1.1

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When a ball is thrown straight up with no air resistance, the acceleration at its highest point

• A) is upward

• B) is downward

• C) is zero

• D) reverses from upward to downward

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If the acceleration of an object is zero, then that object cannot be moving.

• True

• False

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A cargo plane flies horizontally at a speed of 140 m/s at a height of 50 m above the ground. A supply package is dropped out of the bottom of the plane at time t=0. Two seconds later, a second package is dropped out of the bottom of the plane. Air resistance is negligible. How far apart will the packages land on the ground?

• 70m

• 140m

• 280m

• 420m

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NGSS.HS-PS2-1

What are the units of speed?

• m
• m/s
• m/s^2
• s

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What is an example of acceleration?

• The change in velocity over time
• An object's speed changes
• An object in motion changes direction
• All of the above

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