1. A transport truck pulls on a trailer with a force of 600N [E]. The trailer pulls on the transport truck with a force

a) of zero
b) of less than 600 N is the truck is slowing down
c) equal to 600 N only if the truck is moving at constant velocity
d) equal to 600 N no matter what the acceleration of the truck
e) greater than 600 N if the truck is accelerating

2. If the net force is zero
a) the object is at rest
b) the obkect must be in outer space because all objects on Earth have gravity acting on them
c) the object must be slowing down because friction opposes motion
d) the object must be in free fall
e) the object must be at rest or moving at a constant velocity

3. A brick has a mass of 5.0kg and according to a spring scale 49.0N. When the brick is on another planet where the gravitational field force is two times the Earth, the balance will be ____ and the spring scale will read ____
a) 5.0kg; 49N
b) 10.0kg; 98N
c) 5.0kg; 98N
d) 10.0kg; 49N
e) impossible to determine without air resistance

1. The correct answer is c) equal to 600 N only if the truck is moving at constant velocity. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. So, when the truck exerts a force of 600N on the trailer, the trailer exerts a force of 600N on the truck. However, this force will only be equal to 600N if the truck is moving at a constant velocity.

2. The correct answer is e) the object must be at rest or moving at a constant velocity. When the net force on an object is zero, it means that all the forces acting on the object are balanced. In this case, the object could either be at rest or moving at a constant velocity since no unbalanced force is causing it to accelerate or decelerate.

3. The correct answer is b) 10.0kg; 98N. The weight of an object is determined by the gravitational force acting on it, which is given by the formula weight = mass × acceleration due to gravity. Since the gravitational field force on the other planet is two times that of Earth, the weight of the brick will also be two times its weight on Earth. Therefore, the weight of the brick will be 2 × 49.0N = 98.0N. The mass of the brick, however, remains the same at 5.0kg.

1. To answer this question, we need to understand Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. In this case, the transport truck is pulling on the trailer with a force of 600N [E]. So, according to Newton's third law, the trailer will also exert a force on the transport truck.

a) Since the force exerted by the truck on the trailer is 600N [E], the force exerted by the trailer on the truck will also be 600N [W] (equal in magnitude but opposite in direction).

b) If the truck is slowing down, it means there is a net force acting on the truck in the opposite direction of motion. In this case, the force exerted by the trailer on the truck will be less than 600N. So, the answer is "b) of less than 600 N if the truck is slowing down."

c) If the truck is moving at a constant velocity, it means there is no net force acting on it. In this case, the force exerted by the trailer on the truck will be equal to 600N. So, the answer is "c) equal to 600 N only if the truck is moving at constant velocity."

d) Newton's third law states that the forces are equal in magnitude and opposite in direction. So, the force exerted by the trailer on the truck will always be equal to 600N, regardless of the acceleration of the truck. Hence, the answer is "d) equal to 600 N no matter what the acceleration of the truck."

e) If the truck is accelerating, it means there is a net force in the same direction as the acceleration. In this case, the force exerted by the trailer on the truck will be greater than 600N. So, the answer is "e) greater than 600 N if the truck is accelerating."

2. When the net force acting on an object is zero, it means that the forces acting on it are balanced.

a) If the object is at rest, it means there is no net force acting on it to change its motion. So, the answer is "a) the object is at rest."

b) This statement is not correct. The net force being zero does not mean the object is in outer space or that gravity is not acting on it. On Earth, even when the net force is zero, gravity still acts on objects.

c) The statement that the object must be slowing down because friction opposes motion is not universally true. Friction opposes relative motion, not just motion in a particular direction. If there is no net force on the object, it means that the forces are balanced, and there may be no friction (or friction is equal to other opposing forces).

d) The statement that the object must be in free fall is not correct. Free fall refers to the motion of an object under the sole influence of gravity, and having a net force of zero does not necessarily mean the object is in free fall.

e) The correct answer is "e) the object must be at rest or moving at a constant velocity." When the net force is zero, it means the forces acting on the object are in equilibrium, resulting in either the object being at rest or moving at a constant velocity.

3. The weight of an object is the force exerted on it by gravity. The weight of an object can be calculated using the equation weight = mass x gravitational field strength.

a) The mass of the brick is given as 5.0kg, and the spring scale reads 49.0N. This means that the weight of the brick on Earth is 49.0N. However, on another planet where the gravitational field force is two times that of Earth, the weight of the brick would be twice as much. So, the balance will be 10.0kg, and the spring scale will read 98N. Therefore, the answer is "b) 10.0kg; 98N."

1a.

2e.

3c.