Test: Acceleration and Free Fall (20 pts)

When you throw an object in the air, the speed at the top is zero. What is the acceleration at the top?

• 0 m/s²

• -9.8 m/s²

• 40 m/s²

• 100 m/s²

Tags

NGSS.HS-PS2-1

If a ball is thrown straight up and takes 10 seconds to come back down to the same point. At what time did the ball reach its peak?

• 5 seconds

• 3 seconds

• 7 seconds

• Cannot be determined

The relationship between the position and time of a moving object is shown on the graph. During which of the following times does the object accelerate?

• 0 s to 2 s

• 2 s to 4 s

• 0 s to 4 s

• 4 s to 8 s

• 0 s to 8 s

Tags

NGSS.HS-PS2-1

A package is dropped from an air balloon two times. In the first trial, the distance between the balloon and the surface is H, and in the second trial 4H. Compare the time it takes for the package to reach the surface in the second trial to that in the first trial.

• The time in the second trial is four times greater

• The time in the second trial is two times greater

• The time is the same in both trials because it doesn’t depend on the height

• The time in the second trial is four times less

• The time in the second trial is two times less

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Two baseballs are thrown from a cliff with the same initial speed, one is thrown up, and the other is down. Compare the speeds of the baseballs just before they hit the ground.

• The one thrown up moves faster because the initial velocity is up

• The one thrown down moves faster because the initial velocity is down

• The one thrown up moves faster because it has greater acceleration

• The one thrown down moves faster because it has greater acceleration

• They both move with the same speed

Tags

NGSS.HS-PS2-1

A boat starts off with a velocity of 10 m/s, and accelerates with a rate of 20 m/s², what is its velocity after 15 seconds?

• 310 m/s

• 250 m/s

• 200 m/s

• 150 m/s

Tags

NGSS.HS-PS2-1

You throw a ball straight up in the air and it takes 3.2 seconds to come back down. If you catch it at the same spot that you threw it, with what velocity did you throw the ball?

• 15.7 m/s

• 9.8 m/s

• 31.4 m/s

• 3.2 m/s

Tags

NGSS.HS-PS2-1

A robot on mars drops a camera off a cliff. If the height of the cliff is 473.6 m and the camera hits the ground at a speed of 61 m/s, what is the acceleration of gravity on mars?

• 3.9 m/s²

• 6.2 m/s²

• 9.8 m/s²

• 1.6 m/s²

Tags

NGSS.HS-PS2-4

A sprinter starts from rest and runs a 100 meters race on a straight track. The sprinter covers the first 10 meters with a constant acceleration in 2 seconds. The sprinter runs the remaining 90 m with the same velocity he had at the end of 2 seconds. What is the total time it takes for the sprinter to run the full 100m?

• 10 seconds

• 12 seconds

• 13 seconds

• 11 seconds

Tags

NGSS.HS-PS2-1

(Honors) Someone is standing on the bridge, and wants to drop a water balloon on a passerby. A man is jogging on the path below the bridge with a constant speed of 4.2 m/s. The bridge is 11.6 m above the ground. If the balloon is to hit the 1.8m tall jogger on the head, at what horizontal distance x from the bridge should he be when the person drops the balloon?

• 3.8 m

• 5.2 m

• 6.0 m

• 7.1 m

Tags

NGSS.HS-PS2-1