1.
A horse pulls a cart 25 meters with a force of 5 newtons? How much work was done?
Correct Answer
C. 125 J
Explanation
The work done is calculated by multiplying the force applied by the distance traveled. In this case, the force is 5 newtons and the distance is 25 meters. Therefore, the work done is 5 newtons multiplied by 25 meters, which equals 125 joules.
2.
A bird flies 36 meters in 9 seconds. What is the speed of the bird?
Correct Answer
B. 4 m/s
Explanation
The speed of an object is calculated by dividing the distance it travels by the time it takes. In this case, the bird flies 36 meters in 9 seconds, so the speed can be calculated as 36 meters divided by 9 seconds, which equals 4 meters per second.
3.
What is the net force?
Correct Answer
C. 3 N right
Explanation
The net force is the overall force acting on an object, taking into account both the magnitude and direction of all the individual forces. In this case, the given answer of "3 N right" suggests that there are multiple forces acting on the object, and when combined, they result in a net force of 3 N in the right direction.
4.
A man carries a piece of wood with a weight of 80 pounds and walks forward 8 meters. How much work was done?
Correct Answer
C. 0 J
Explanation
Work is defined as the product of force and displacement in the direction of the force. In this case, the man is carrying the wood forward, but there is no mention of any force being applied to the wood. Therefore, no work is done. The answer is 0 J.
5.
What is the net force?
Correct Answer
A. 15 N back
Explanation
The net force is the overall force acting on an object. In this case, the net force is 15 N back. This means that there are forces acting on the object in both the forward and backward directions, but the backward force of 15 N is greater than the forward forces. As a result, the net force is in the backward direction.
6.
A runner finishes a 150 meter race in only 15 seconds. What was his speed?
Correct Answer
B. 10 m/s
Explanation
The runner's speed can be calculated by dividing the distance covered (150 meters) by the time taken (15 seconds). Therefore, the runner's speed is 10 meters per second.
7.
Is this an example of work?
Correct Answer
B. NO
Explanation
The given question asks whether the given situation is an example of work or not. The answer is "NO" because the question does not provide any information or context about a specific situation or activity that can be considered as work. Without any context, it is not possible to determine if it is an example of work or not.
8.
What is the net force?
Correct Answer
B. 0 N -- balanced
Explanation
The net force is 0 N because the given options state that the force is balanced. In a balanced force situation, the forces acting on an object cancel each other out, resulting in a net force of 0 N. This means that there is no overall force acting on the object, causing it to remain at rest or continue moving at a constant velocity.
9.
A football player pushes another player forward 4 meters with a force of 100 N. How much work was done?
Correct Answer
C. 400 J
Explanation
Work is defined as the product of force and displacement in the direction of the force. In this case, the football player pushes another player forward by applying a force of 100 N for a displacement of 4 meters. Therefore, the work done is calculated as the force (100 N) multiplied by the displacement (4 m), resulting in 400 J (Joules) of work done.
10.
What is the speed of a shark swimming 30 meters in 6 seconds?
Correct Answer
B. 5 m/s
Explanation
The speed of a shark swimming 30 meters in 6 seconds can be calculated by dividing the distance traveled by the time taken. In this case, the shark swims 30 meters in 6 seconds, so the speed is 30/6 = 5 m/s.
11.
A crane lifts up a load of rocks 2 meters with a force of 90 N. How much work was done?
Correct Answer
B. 180 J
Explanation
Work is calculated by multiplying force by distance. In this case, the force is given as 90 N and the distance is 2 meters. Therefore, the work done is equal to 90 N multiplied by 2 meters, which equals 180 J (joules).
12.
What is the speed of the boat traveling 60 meters in 10 seconds?
Correct Answer
A. 6 m/s
Explanation
The speed of the boat traveling 60 meters in 10 seconds is 6 m/s. This can be calculated by dividing the distance traveled (60 meters) by the time taken (10 seconds), which results in a speed of 6 meters per second.
13.
A large rock is pushed with a force of 100 N, but does not move. How much work was done?
Correct Answer
B. 0 J
Explanation
If the rock does not move, it means that there is no displacement in its position. In order for work to be done, there must be a displacement in the direction of the force applied. Since the rock does not move, no work is done on it. Therefore, the work done is 0 J.
14.
What is the speed of a car moving 240 meters in 6 seconds?
Correct Answer
D. 40 m/s
Explanation
The speed of a car can be calculated by dividing the distance traveled by the time taken. In this case, the car moves 240 meters in 6 seconds, so the speed is 240/6 = 40 m/s.
15.
Students play tug of war. Team A pulls East with a force of 250 N. Team B pulls West with a force of 300 N. What is the net force?
Correct Answer
A. 50 N west
Explanation
The net force is the vector sum of all the individual forces acting on an object. In this case, Team A is pulling East with a force of 250 N, and Team B is pulling West with a force of 300 N. Since the forces are in opposite directions, we need to subtract the smaller force from the larger force to find the net force. 300 N - 250 N = 50 N. The net force is 50 N west.