The distance vs



Name: ____________________

Physics: Force and Motion- Review Sheet

The distance vs. time graph below shows data collected as a remote-controlled car moved across a level parking lot.

[pic]

1. According to the graph, which of the following conclusions about the car's motion is supported?

|  |A. |The car is accelerating. |

|  |B. |The car is stopping and starting. |

|  |C. |The car is traveling at a constant velocity. |

|  |D. |The car is moving through an obstacle course. |

32. Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 4.8 m/s2?

|Force Acting on Cart (N) |Cart Acceleration (m/s2) |

| |0.4 |

|1 | |

| | |

|2 |0.8 |

| | |

|7 |2.8 |

| | |

|9 |3.6 |

| | |

|? |4.8 |

2. The forces acting on a skateboarder moving at a constant velocity along a sidewalk are shown in the figure below.

|Normal force = 600 N |

|Weight of skateboarder = 600 N |

| |

|[pic] |

Which of the following is the net force on the skateboarder?

|  |A. |0 N |

|  |B. |70 N |

|  |C. |670 N |

|  |D. |1270 N |

3. A sailboat travels 35 km in 5 hr. Which of the following describes the motion of the sailboat?

|  |A. |Its momentum is 7 km/hr. |

|  |B. |Its acceleration is 7 km/hr. |

|  |C. |Its displacement is 7 km/hr. |

|  |D. |Its average speed is 7 km/hr. |

The graphs below show movement over time.

[pic]

4. A truck and car are on separate journeys on the same straight road. The truck is traveling at a constant velocity. The car changes speed and direction.

a. Which of the graphs best represents the truck’s journey? Explain your answer. Graph A because a straight line represents constant ration of distance over time--represents constant velocity

b. Which of the graphs best represents the car’s journey? Explain your answer. Graph B..car travels at a constant speed of 3 minutes, stops and reverses direction

The chart below shows the position of a car moving in a straight line.

|Position of a Car |

|Time (s) |Position (m) |

|0 |75 |

|10 |125 |

|20 |175 |

|30 |225 |

|40 |275 |

a. Use the data in the chart to draw and correctly label a position versus time graph.

Based on the data in the chart, what is the average speed of the car in m/s from 0 s to 40 s?

D= 275-75 T= 40-0 =200/40 = 5 m/s

b. Based on the graph that you have drawn, describe the acceleration of the car. No acceleration because no change in direction or speed

Two forces act on the 2 kg box shown below.

[pic]

c. A 4 N force acts to the right and a 6 N force acts to the left. What is the net force acting on the box?

|  |A. |10 N to the right |

|  |B. |10 N to the left |

|  |C. |2 N to the right |

|  |D. |2 N to the left |

The graph below relates speed and time of four cars (1, 2, 3, and 4) traveling along a straight highway.

d. Which two cars move with zero acceleration?

|  |A. |1 and 4 |

|  |B. |2 and 3 |

|  |C. |1 and 2 |

|  |D. |and 4 |

e. Study all vocabulary taken in your journal.

f. The graph above shows the motion of a model train. What was the average speed of the train in meters/second between points D and H? Round your answer to the nearest tenth, writing and bubbling your answer on the grid above.

g. A lion travels 15 miles in 3 days. What is the lion’s average speed per day?

5 miles / 3 days = 5m/d

h. If arrows are used to express force, describe the difference between the forces below.

a.

b.

Longer arrow more force..thicker arrow more force..

a. Larger force and smaller force in the same direction combine

b. smaller force to the right and larger force to the left..the object will move to the left

Car ramp lab:

3. Describe the purpose of the clay and string in the car lab. ___exert a constant force on the car__

4. What was the independent variable in the car ramp lab?

__the position of the black photogate________________________

5. What was the dependent variable in the car ramp lab? _____The speed of the car___________________________________

i. Review the following: Scientific method foldable in journal, All notes in Journal to include definitions, and interpreting graph notes. All powerpoint presentations of notes are on your teacher’s web

j. The three vehicles are moving at 50 mi/hr. The Minivan and sedan are not accelerating because? The minivan and sedan are not accelerating because they are not changing speed or direction in the image

k. A student runs 6 km in 30 min. What is the students average speed in km/hour?

30 min = .5 hrs. the answer wants your units in km/hr not km/min. so 6km/.5hr = 12 km/hr

l. The diagram below shows a boat moving north in a river at 3 m/s while the current in the river moves south at 1 m/s.

How will the boat be affected if it enters a part of the river where the current is moving south at 6 m/s?

If the boat enters a part of the river where the current is moving south at 6 m/s. then the boat will move with the current south. It changes directions.

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2.

1.

Forces

with a

can be measured

In the units of

3.

4.

Directions for Concept Map: Use the following list to complete thinking for questions 1-5.

A. Unbalanced

B. Newtons (N)

C. Balanced

D. Motion

E. Spring Scale

With net force zero are

With calculated net forces are

Evident by change in

5.

Pickup Truck

Sedan

Minivan

Current 1 m/s

Boat 3 m/s

12 N x .4m/s2 = 4.8 m/s2

100

200

300

400

10 20 30 40

Position (m)

Time (s)

2m / 4s= .5m/s

Spring Scale

Newtons

Balanced

unbalanced

motion

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