1. What is the equation for speed? *
1 point
A d=s/t
B s=d * t
C s= d/t
D t= s/d
2. Acceleration refers to: *
1 point
A. speeding up
B. slowing down
C. changing direction
D. All of the above
3. Your family is driving to the beach. You travel 200 kilometers in the first two hours. During the next hour, you stop for lunch and only travel 25 kilometers. What was your average speed? *
1 point
A. 60 km/h
B. 75 km/h
C. 100 km/h
D. 225 km/h
4. The graph below shows the motion of a person. Describe the motion. *
1 point
Captionless Image
A. The person is traveling at a constant speed of 1.5 meters per second for 10 seconds. Then the person stands still for 10 seconds.
B. The person is speeding up for 10 seconds and then going a constant speed for 10 seconds.
C. The person is going northeast for 10 seconds and then going directly east for 10 seconds.
D. The person is traveling at an increasing speed for 10 seconds and then travels at a constant speed of 15 meters per second for 10 seconds
5. A force is described by its _____________ and ____________. *
1 point
A mass; direction
B strength; mass
C strength; direction
D mass; acceleration
6. Which of the following describes velocity? *
1 point
A A car drives 30 miles in 2 hours
B An airplane is moving towards the west at a speed of 482 km per hour.
C Matt turns left at Main Street.
D Suzie slows down at a stop sign.
7. The combination of all the forces on an object is called the_____________. *
1 point
A. total force
B net force
C combined force
D absolute force
8. What is the net force on the box? *
1 point
Captionless Image
A 15 N to the right
B 25 N
C 10 N to the left
D 5 N to the right
9. Look at the diagram below. The friction force between the bag and the floor is 4N. What is the net force acting on the bag? *
1 point
Captionless Image
A. The net force is 29N to the right
B. The net force is 21N to left
C. The net force is 21N to right
D. The net force is 39N to the right
10. Which of the following is true regarding how to calculate net force? *
1 point
A. If forces are acting in the same direction, you can find the net force on an object by subtracting together the strengths of all the individual forces
B. If forces are acting in opposite directions, the strength of the force is found by multiplying the strength of the smaller force from the strength of the larger force
C. If forces are acting in opposite directions, the strength of the force is found by subtracting the strength of the smaller force from the strength of the larger force
D. A. If forces are acting in the same direction, you can find the net force on an object by multiplying together the strengths of all the individual forces
11. What is Newton's first law of motion? *
1 point
A An object at rest will remain at rest, an object in motion will remain in motion, unless acted upon by an unbalanced force
B an object's acceleration depends on its mass and the net force acting upon the object
C if one object exerts a force on another object, then the second force exerts an equal and opposite force back on the first object
12. What is Newton's second law of motion? *
1 point
A An object at rest will remain at rest, an object in motion will remain in motion, unless acted upon by an unbalanced force
B if one object exerts a force on another object, then the second force exerts an equal and opposite force back on the first object
C an object's acceleration depends on its mass and the net force acting upon the object
13. What is Newton's third law of motion? *
1 point
A an object's acceleration depends on its mass and the net force acting upon the object
B if one object exerts a force on another object, then the second force exerts an equal and opposite force back on the first object
C An object at rest will remain at rest, an object in motion will remain in motion, unless acted upon by an unbalanced force
14. Suppose that four dogs pull a sled carrying two people. How could you increase the acceleration of the sled? *
1 point
A Add more people to the sled
B Remove dogs from the sled
C Add more dogs to pull the sled
D Decrease the force applied or decrease the mass of the sled
15. Rowing a boat and a rocket taking off into space are examples of which law of motion? *
1 point
A law of gravitational force
B law of inertia
C Newton's 2nd law of Motion
D Newton's 3rd law of motion
16. To do work on an object, the force you exert must be ______________ *
1 point
A in the same direction as the object's motion
B greater than 100N
C difficult
D in the opposite direction as the object's motion
17. The formula for work is *
1 point
A Work= distance divided by force
B work= distance x speed
C work= force x distance
D work= force x speed
18. How much work does the climber do on his pack if his pack weighs 90 N and he climbs to a height of 30 m? *
1 point
A 3 J
B 270 J
C 30 J
D 2,700 J
19. How much work do you do when you push a shopping cart with a force of 20 N for a distance of 5m? *
1 point
A 100 J
B 10 J
C 1 J
D 1000 J
20. If the object does not move, is work being done? *
1 point
A Depends on how much force is applied
B Yes, if you are trying to move the object, it does not mean that you did not work hard
C No, because not enough force was applied
D No, no matter how much force is applied, the object must have motion for work to be done
uuuuuhhhhh i just popped up here well bye mr.bob
uhhh Dr.Bob222 those were not even answers
also
EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
1. The equation for speed is option C: s = d/t. Speed is calculated by dividing the distance traveled (d) by the time it takes to travel that distance (t).
2. Acceleration refers to option D: All of the above. Acceleration can refer to both speeding up, slowing down, and changing direction. It is a measure of how quickly an object's velocity changes.
3. To find the average speed, you need to calculate the total distance traveled and the total time taken. In this case, you traveled 200 kilometers in the first two hours and an additional 25 kilometers in the next hour. The total distance traveled is 200 + 25 = 225 kilometers, and the total time taken is 2 + 1 = 3 hours. To find the average speed, divide the total distance by the total time: 225 km / 3 h = 75 km/h. Therefore, the average speed is option B: 75 km/h.
4. Looking at the graph, it shows the person traveling at a constant speed of 1.5 meters per second for 10 seconds, and then the person stands still for 10 seconds. Therefore, the motion described in the graph is option A: The person is traveling at a constant speed of 1.5 meters per second for 10 seconds. Then the person stands still for 10 seconds.
5. A force is described by its option C: strength and direction. The strength of a force refers to how powerful or intense it is, while the direction of a force indicates which way it is applied.
6. Velocity is a measure of both speed and direction. Among the options given, option B describes velocity: An airplane is moving towards the west at a speed of 482 km per hour.
7. The combination of all the forces on an object is called the option B: net force. The net force is the overall force that results from combining all the individual forces acting on an object.
8. Looking at the image, it shows a box with a force of 25 N acting to the right and a force of 10 N acting to the left. To find the net force, subtract the force acting in the opposite direction. So, 25 N - 10 N = 15 N. Therefore, the net force on the box is option A: 15 N to the right.
9. From the diagram, it is given that the friction force between the bag and the floor is 4 N. Since there are no other forces indicated, the net force acting on the bag is the same as the friction force. Therefore, the net force acting on the bag is option C: The net force is 21N to the right.
10. To calculate the net force, if forces are acting in the same direction, you can find the net force on an object by adding together the strengths of all the individual forces (option A). If forces are acting in opposite directions, the strength of the force is found by subtracting the strength of the smaller force from the strength of the larger force (option C).
11. Newton's first law of motion is option A: An object at rest will remain at rest, and an object in motion will remain in motion unless acted upon by an unbalanced force.
12. Newton's second law of motion is option C: An object's acceleration depends on its mass and the net force acting upon the object. It can be mathematically expressed as F = ma, where F is the net force, m is the mass, and a is the acceleration.
13. Newton's third law of motion is option B: If one object exerts a force on another object, then the second object exerts an equal and opposite force back on the first object. This law is also known as the law of action-reaction.
14. To increase the acceleration of the sled, you need to either increase the applied force or decrease the mass of the sled. Among the options given, adding more dogs to pull the sled (option C) would increase the applied force and thus increase the acceleration.
15. Rowing a boat and a rocket taking off into space are examples of option D: Newton's 3rd law of motion. The law states that for every action, there is an equal and opposite reaction. In the case of rowing a boat, the action is pushing against the water with the oars, and the reaction is the boat moving forward. In the case of a rocket, the action is the expulsion of gases backward, and the reaction is the rocket moving forward.
16. To do work on an object, the force you exert must be option A: in the same direction as the object's motion. Work is defined as the product of the force applied to an object and the distance over which the force is applied.
17. The formula for work is option C: work = force x distance. This formula calculates work by multiplying the force applied to an object by the distance the object moves in the direction of the force.
18. To calculate the work done by the climber on his pack, multiply the force exerted (90 N) by the distance climbed (30 m). So, work = 90 N x 30 m = 2700 J. Therefore, the work done on the pack is option D: 2,700 J.
19. To calculate the work done when pushing a shopping cart, multiply the force exerted (20 N) by the distance traveled (5 m). So, work = 20 N x 5 m = 100 J. Therefore, the work done when pushing the shopping cart is option A: 100 J.
20. If the object does not move, no work is being done. Work is defined as the product of force and distance, and if the object remains stationary, the distance traveled is 0. Therefore, regardless of the amount of force applied, if the object does not move, no work is done. So, the answer is option D: No, no matter how much force is applied, the object must have motion for work to be done.