Physics Midterm Review

release 1 , equal

On which release, will the cart have a greater maximum speed? On which release, will the cart have a greater acceleration?

34.6 m

A bicyclist steadily speeds up from rest to 11.0m/s in 6.30s. How far did she travel during this time?

18.1 m/s

A bicyclist, initially at rest, begins pedaling and gaining speed steadily for 7.50s during which she covers 68.0m. What was her final speed?

218 ft

A car, initially traveling 16.0ft/s, steadily speeds up to 48.0ft/s in 6.80s. Determine all unknowns and answer the following question. How far did the car travel during this time?

2.59 s, 16.6 m/s

A forensic scientist is investigating an accident scene where a self-driving car drove off a 33.0m tall cliff and landed 43.0m from the base of the cliff (measured along the ground). Neglect drag. How long did the car remain in the air? How fast did the car drive off the cliff?

30.8 m/s

A rocket, initially at rest, steadily gains speed for 3.90s while traveling upwards 60.0m. What was the rocket's final speed?

4.11 s, 40.4 m/s

A student drops a ball from a height of 83.0m. Determine all unknowns and answer the following questions. Neglect drag. How long did the ball remain in the air? What was the ball's speed just before striking the ground?

37.4 m/s, 71.2 m

A student drops a ball off the top of building and records that the ball takes 3.81s to reach the ground. Determine all unknowns and answer the following questions. Neglect drag. What was the ball's speed just before striking the ground? From what height was the ball dropped?

directly below the helicopter, equal, B

A student drops ball A out of a stationary helicopter from the same height and at the same time as a student drops ball B out of a helicopter flying horizontally to the right. Assume negligible drag. If the helicopter maintains a constant speed, where will ball B land? Which will hit the ground first? Which will travel a greater horizontal distance (in the air)?

https://www.positivephysics.org/lesson/physics/projectile-motion/motion-charts?courseID=1&unitID=10&skillID=62&mode=work&problemID=2067 (yk the drill)

A student fires a cannonball diagonally from the ground as shown. Neglect drag and the initial height of the cannonball. After the ball lands on the ground enter zero for all speeds and heights if necessary.

https://www.positivephysics.org/lesson/physics/projectile-motion/motion-charts?courseID=1&unitID=10&skillID=62&mode=work&problemID=2068

A student fires a cannonball horizontally from on top of a building as shown. The ball remains in the air for 6s. Neglect drag.

37 m/s, 0 m/s, 3.32 s, 123 m

A student fires a cannonball horizontally with a speed of 37.0m/s from a height of 54.0m. Neglect drag. What was the cannonball's initial horizontal speed? What was the cannonball's initial vertical speed? How long did the ball remain in the air? How far from the base of the building will the ball land (measured along the ground)?

a. height: Increasing speed: decreasing b. speed: zero c. height: decreasing speed: increasing

A student fires a cannonball upwards from the ground. Describe whether the cannonball's height and speed are increasing, decreasing, constant or zero at each time. a. height: speed: b. speed: c. height: speed:

earth hammer 1 - yes 2 - yes 3 - no 4 - no 5 - yes 6 - no 7 - yes 8 - no

A student on earth and an astronaut on the moon each drop a hammer and a feather from the same height. Neglect drag when reasonable. Which object(s) hit the ground in the shortest time? Fill out the chart 1-8

2.8 s

A student releases a marble from the top of a 210cm ramp. The marble increases speed steadily and reaches the bottom of the ramp with a speed of 150cm/s. Determine all unknowns and answer the following question. How long did the marble take to reach the bottom of the ramp?

146 cm/s

A student releases a marble from the top of a ramp. The marble increases speed steadily and travels 190cm in 2.60s. What was the marble's final speed?

increasing

A student times a bicyclist passing by three equally spaced flags. She starts her stopwatch when the bicyclist passes flag A and records the times the bicyclist passes flags B & C as shown. Describe her speed as increasing, decreasing or constant, assuming she maintains one type of motion as she passes the flag.

at 90 degrees, between 0 and 45 degrees

A student, on top of a building, has a cannon that can be adjusted to any angle. All angles are relative to the horizontal. At what angle should a student launch a cannonball such that the cannonball will have the greatest maximum height? At what angle should a student launch a cannnball such that the cannonball will travel the greatest horizontal distance while in the air?

train , rabbit

A typical freight train travels at up to 50mph but takes minutes to get going. A rabbit can sprint 30mph but can reach top speed in a few seconds. Who has a greater top speed? Who has a greater acceleration?

1.67 m and East

Add the two given vectors to find the resultant vector. What is the magnitude of the resultant vector? and What is the direction of the resultant vector? (North East South West none)

constant

Describe the car's speed in the picture

decreasing

Describe the car's speed in the picture

increasing

Describe the car's speed in the picture

acceleration

Describes an object's change in velocity each second.

distance/displacement

Describes how far an object moved.

speed/velocity

Describes how fast an object is moving.

falling hammer: free fall feather: not cannonball: free fall cannonball at max height: free fall bicyclist: not rocket burning fuel: not rocket out of fuel: free fall

Determine if each of the following objects is in free fall. Neglect drag for the hammer, cannonball, bicyclist, and rocket. falling hammer: feather: cannonball: cannonball at max height: bicyclist: rocket burning fuel: rocket out of fuel:

1 - -6.83 2 - 0 3 - -6.83 4 - 0 5 - -4.69 6 - -4.69 8.29 m and 34.5°, South of West

Fill out the table in the picture labeled 1 - 6 and answer the following questions... What is the magnitude of the resultant vector? and What is the direction of the resultant vector?

1 - -7.4 2 - 2.41 3 - -4.98 4 - 2.99 5 - -5.69 6 - -2.70 5.67 m and South of West

Fill out the table in the picture labeled 1 - 6 and answer the following questions... What is the magnitude of the resultant vector? and What is the direction of the resultant vector?

horizontal distance/displacement

How far an object traveled, measured along the ground.

vertical speed/velocity

How fast an object is moving up or down.

horizontal speed/velocity

How fast an object's shadow is moving across the ground (with the sun directly overhead).

1: 0 2: 1.49 3: H 4: θ 5: A 6: 1.88

Label the sides and angle and calculate the missing values in the triangle: Note 1,3,4,5,: describes the type of side or angle (like adjacent)

https://www.positivephysics.org/lesson/physics/free-fall/motion-charts?courseID=1&unitID=9&skillID=53&mode=work&problemID=742 - just check the answer (I'm too lazy)

Make a motion chart for a cannonball launched with an initial speed of 20m/s. Neglect drag. what is the motion at 1s

vertical distance/displacement

The height an object rose or dropped.

initial speed, A, A, B

Three cannonballs are launched from identical cannons but at different angles as shown. Assume negligible drag. Which initial quantity is the same for all three cannonballs? Which will reach the greatest maximum height? Which will have the greatest flight time? Which will travel the greatest horizontal distance (in the air)?

1 - 0 2 - 30 3 - 60 4 - 35 5 - 35 6 - 35 CAR B

Two cars are racing! Car A steadily speeds up from rest to 60mph at the finish line. Car B is already moving 35mph at the start and maintains a constant speed for the duration of the race. Determine the initial, average, and final velocity of each car and select the winner. Label the Chart (1-6) and answer the following question: Which car will win the race?

hammer and golf ball

Two students simultaneously drop a hammer, feather and golf ball from the same height on earth. Which object hits the ground first?

all objects will hit the ground at the same time

Two students simultaneously drop a hammer, feather and golf ball from the same height on the moon. Which object hits the ground first?

0s - 20s: 87.5 m, right 20s - 60s: 113 m, left 25 m, left 0s - 20s: 4.38 m/s 20s - 60s: 2.81 m/s

What are the distance and direction traveled during the following time periods? 0s - 20s: 20s - 60s: How far away and in what direction from their starting position does she end up? What is the cheetah's speed during the following time periods? 0s - 20s: 20s - 60s: