To cause a 25 kg object to experience an acceleration of 2 m/s2 the net force that needs to be applied to the object is

A) 10 N B) 5 N C) 50 N D) 100 N A) 10 N B) 5 N C) 50 N D) 100 N

Suppose a 2 kg object is falling through the air and accelerating downwards at 8 m/s2. Taking g = 10 m/s2 What is the magnitude and direction of the force of air resistance on it?

A) 2N downward B) 2N upward C) 1N downward D) 1N upward A) 2N downward B) 2N upward C) 1N downward D) 1N upward

An object experiences a net force of 20 N and has an acceleration of 4 m/s2. The object's mass must be

A) 20 kg B) 5 kg C) 80 kg D) 2 kg A) 20 kg B) 5 kg C) 80 kg D) 2 kg

The neighborhood joker comes up to you and is really on a roll this morning. After several "good ones" they then say "OK so you're taking physics, right? Here's one - if the acceleration of gravity is 9.8 m/s2 then why isn't everything accelerating? HAHAHA". Being a dedicated student you give this question some real thought and come up with a reasonable response. You might say

A) All things really do accelerate but we accelerate with them so we can't tell. B) Gravity acts only on things that are not touching a surface. C) Gravity is just part of the story and it is the total net external force that determines acceleration. D) Most objects have too much inertia for us to see them accelerate under the influence of gravity. A) All things really do accelerate but we accelerate with them so we can't tell. B) Gravity acts only on things that are not touching a surface. C) Gravity is just part of the story and it is the total net external force that determines acceleration. D) Most objects have too much inertia for us to see them accelerate under the influence of gravity.

Exam 1: The Laws of Motion, Part 1

Suppose you drop an object out of the window of a building and wait for it to hit the ground. How does the halfway point in distance compare to the halfway point in time? Please explain.

(Essay)

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Question 41

Suppose you are helping take groceries inside your house and you carry a heavy bag from the car to the house, keeping the bag at a constant level and walking at a constant speed. During your trip the work you do on the bag is

(Multiple Choice)

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Question 42

Suppose an ice skater is moving on the surface of a frozen lake at constant velocity. What is true about the external (outside) forces acting on the skater?

(Multiple Choice)

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Question 43

Suppose you are a football player and you kick a ball for a field goal. Including air resistance, the ball's horizontal velocity

(Multiple Choice)

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Question 44

Consider a 6 kg box of holiday candy on a horizontal surface such as a table. There is a 10N applied force to the right and a 7 N frictional force to the left. Suppose the block moves 3 m to the right across the table, to its impending doom of hungry guests. -What is the work done by the 7 N frictional force?

(Essay)

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Question 45

You are making a round trip from City A to City B and back to City A again at constant speed. At what point in the trip is your average speed equal to three times the magnitude of your average velocity?

(Essay)

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Question 46

Suppose that the night before your big physics exam you stayed up late watching stand - up physics comedians. Sides sore from having laughed too hard you come to class and are in the middle of the test when you get stuck. You are doing a calculation problem and know the answer must have units of velocity and are searching for a possible formula. Which of the following formulae would work for the problem?

(Multiple Choice)

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Question 47

Suppose Larissa throws a ball up in the air and it comes back down to the same place she threw it from. Ignoring times when the ball is in contact with her hand, and ignoring air resistance (friction with the air), identify the point(s) of -Please briefly describe the energy transformation taking place as the ball rises in the air, and also when it is falling back to earth.

(Essay)

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Question 48

You walk in a given direction for 20 m during the first 5 seconds of a trip and then 15 m during the next 2 seconds. Your average speed is equal to

(Multiple Choice)

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Question 49

To cause a 25 kg object to experience an acceleration of 2 m/s² the net force that needs to be applied to the object is

(Multiple Choice)

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Question 50

You are riding a bicycle into a strong head wind, but manage to keep moving in a straight line at a constant speed. The net force on you is

(Multiple Choice)

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Question 51

At a speed of 12 m/sec how far can you travel in one minute?

(Multiple Choice)

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Question 52

Suppose a 2 kg object is falling through the air and accelerating downwards at 8 m/s². Taking g = 10 m/s² What is the magnitude and direction of the force of air resistance on it?

(Multiple Choice)

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Question 53

Which of the following devices on a car can be used to cause the car to accelerate?

(Multiple Choice)

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Question 54

Suppose you have a car traveling down the road at constant speed and not changing direction. It is experiencing gravity, wind resistance and frictional forces from the road. What can be said about the car's acceleration?

(Multiple Choice)

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Question 55

An object experiences a net force of 20 N and has an acceleration of 4 m/s². The object's mass must be

(Multiple Choice)

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Question 56

In order to do a positive amount of work you must

(Multiple Choice)

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Question 57

The neighborhood joker comes up to you and is really on a roll this morning. After several "good ones" they then say "OK so you're taking physics, right? Here's one - if the acceleration of gravity is 9.8 m/s² then why isn't everything accelerating? HAHAHA". Being a dedicated student you give this question some real thought and come up with a reasonable response. You might say

(Multiple Choice)

4.9/5

(33)

Question 58

Suppose a tree branch falls down to the ground with constant acceleration and takes 2 seconds to hit the ground. Which of the following statements regarding the path of the branch is true?

(Multiple Choice)

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Question 59

A net force of 8 N is applied to a 2 kg object. The object's acceleration is

(Multiple Choice)

4.9/5

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Question 60

Showing 41 - 60 of 76

Suppose you drop an object out of the window of a building and wait for it to hit the ground. How does the halfway point in distance compare to the halfway point in time? Please explain.

Suppose you are helping take groceries inside your house and you carry a heavy bag from the car to the house, keeping the bag at a constant level and walking at a constant speed. During your trip the work you do on the bag is

Suppose an ice skater is moving on the surface of a frozen lake at constant velocity. What is true about the external (outside) forces acting on the skater?

Suppose you are a football player and you kick a ball for a field goal. Including air resistance, the ball's horizontal velocity

You are making a round trip from City A to City B and back to City A again at constant speed. At what point in the trip is your average speed equal to three times the magnitude of your average velocity?

You walk in a given direction for 20 m during the first 5 seconds of a trip and then 15 m during the next 2 seconds. Your average speed is equal to

To cause a 25 kg object to experience an acceleration of 2 m/s² the net force that needs to be applied to the object is

You are riding a bicycle into a strong head wind, but manage to keep moving in a straight line at a constant speed. The net force on you is

At a speed of 12 m/sec how far can you travel in one minute?

Suppose a 2 kg object is falling through the air and accelerating downwards at 8 m/s². Taking g = 10 m/s² What is the magnitude and direction of the force of air resistance on it?

Which of the following devices on a car can be used to cause the car to accelerate?

Suppose you have a car traveling down the road at constant speed and not changing direction. It is experiencing gravity, wind resistance and frictional forces from the road. What can be said about the car's acceleration?

An object experiences a net force of 20 N and has an acceleration of 4 m/s². The object's mass must be

In order to do a positive amount of work you must

Suppose a tree branch falls down to the ground with constant acceleration and takes 2 seconds to hit the ground. Which of the following statements regarding the path of the branch is true?

A net force of 8 N is applied to a 2 kg object. The object's acceleration is

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