Unit 1: Kinematics Review

A diver initially moving horizontally with speed v dives off the edge of a vertical cliff and lands in the water at time t a distance d from the base of the cliff. How far from the base of the cliff would the diver have landed if the diver initially had been moving horizontally with speed 2v?

• d

• √2d

• 2d

• 4d

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NGSS.HS-PS2-1

A projectile is fired with initial velocity vo at an angle θ₀ with the horizontal and follows the trajectory shown above. Which of the following pairs of graphs best represents the vertical components of the velocity and acceleration, v and a, respectively, of the projectile as functions of time t?

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NGSS.HS-PS2-1

An object is released from rest on a planet that has no atmosphere. The object falls freely for 3.0 meters in the first second. What is the magnitude of the acceleration due to gravity on that planet?

•  1.5 m/s²

•  3.0 m/s²

• 6.0 m/s²

• 10.0 m/s²

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

A rock of mass m is thrown horizontally off a building from a height h, as shown above. The speed of the rock as it leaves the thrower’s hand at the edge of the building is v₀. How much time does it take the rock to travel from the edge of the building to the ground?

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NGSS.HS-PS2-1

A whiffle ball is tossed straight up, reaches a highest point, and falls back down. Air resistance is not negligible. Which of the following statements are true?

I. The ball’s speed is zero at the highest point

II. The ball’s acceleration is zero at the highest point.

III. The ball takes a longer time to travel up to the highest point than to fall back down

• I Only

• II Only

• I & II Only

• I & III Only

The diagram below shows three cannons firing shells with different masses at different angles of elevation. The horizontal component of the shell's velocity is the same in all three cases. In which case will the shell have the greatest range if air resistance is neglected?

• cannon A

• cannon B

• cannon C

• Both cannons B and C have the greatest range

A child left her home and started walking at a constant velocity. After a time she stopped for a while and then continued on with a velocity greater than she originally had. All of a sudden she turned around and walked very quickly back home. Which of the following graphs best represents the distance versus time graph for her walk?

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Consider a ball thrown up from the surface of the earth into the air at an angle of 30° above the horizontal. Air friction is negligible. Just after the ball is released, its acceleration is:

• 0 m/s²

• Upwards at 9.8 m/s²

• Downwards at 9.8 m/s²

• Upwards at 4.9 m/s²

• None of these

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NGSS.HS-PS2-1

The graph given here shows the position vs. time for an object traveling along the x-axis. Which graph below shows the velocity vs. time for this same object during the same time period?

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Which of the following sets of graphs might be the corresponding graphs of Position, Velocity, and Acceleration vs. Time for a moving particle?

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NGSS.HS-PS2-1