Which of the following best describes the sum of all forces acting on an object?(1 point) Responses net force, which is a vector sum net force, which is a vector sum gravitational force, which is a vector sum gravitational force, which is a vector sum acceleration, which is a vector sum acceleration, which is a vector sum net force, which is a scalar sum
The correct answer is "net force, which is a vector sum."
Suppose a man is sitting on a chair and exerting 100 N of force downward, while a spring beneath the chair exerts 150 N of force upward. If you assign a negative value to the downward force, what is the net force of this system?(1 point) Responses 50 N 50 N 50 kg 50 kg 250 N 250 N -50 N
The net force of this system can be calculated by subtracting the downward force from the upward force.
Upward force = 150 N (positive)
Downward force = -100 N (negative)
Net force = Upward force + Downward force
= 150 N + (-100 N)
= 50 N
So, the net force of this system is 50 N.
During a game of pool, a cue ball travels to the left with 70 N of force and collides with the four ball moving with a force of 50 N to the right. If you assign a negative value to the force moving to the right, what is the net force of this system?(1 point) Responses -20 N -20 N 20 N 20 N 20 m/s2 20 m/s2 120 N 120 N
To calculate the net force of this system, we need to add up the forces acting in the same direction and subtract the forces acting in the opposite direction.
Given:
Force of the cue ball = -70 N (negative because it is moving to the left)
Force of the four ball = 50 N (positive because it is moving to the right)
Net force = Sum of forces
= -70 N + 50 N
= -20 N
Therefore, the net force of this system is -20 N.
Recall that the formula for momentum is: P=mvP=mv Which of the following correctly shows momentum being calculated? (1 point) Responses 45 kg*m/s=(9 kg) (5 m/s)45 kg*m/s=(9 kg) (5 m/s)45 kg * m / s = ( 9 kg ) ( 5 m / s ) 45 N=(9 kg) (5 m/s)45 N=(9 kg) (5 m/s)45 N = ( 9 kg ) ( 5 m / s ) 4 kg*m/s=(9 kg) (5 m/s)4 kg*m/s=(9 kg) (5 m/s)4 kg * m / s = ( 9 kg ) ( 5 m / s ) 14 kg*/s=(9 kg) (5 m/s)s
The correct calculation for momentum is:
P = (9 kg) * (5 m/s)
Therefore, the correct option is:
45 kg * m/s = (9 kg) * (5 m/s)
A hockey puck with a mass of 0.12 kg is traveling across the ice at a velocity of 150 m/s downfield. What is the momentum of the hockey puck?(1 point) Responses P=18 kg*m/sP=18 kg*m/sP = 18 kg * m / s P=18 NP=18 NP = 18 N P=8*10−4 kg*m/sP=8*10-4 kg*m/sP = 8 * 10 - 4 kg * m / s M=18 kg*m/s
To calculate the momentum of the hockey puck, we use the formula:
Momentum (P) = mass (m) * velocity (v)
Given:
Mass (m) = 0.12 kg
Velocity (v) = 150 m/s
Momentum (P) = 0.12 kg * 150 m/s
= 18 kg*m/s
Therefore, the momentum of the hockey puck is 18 kg*m/s.
The correct option is: net force, which is a vector sum.
To understand this concept, let's break down the question and each of the provided options:
1. Net force: This term refers to the overall force on an object, taking into account the combination of all individual forces acting on it. It considers both the magnitude and direction of each force that influences the motion of the object. Net force is always expressed as a vector quantity, meaning it has both magnitude and direction.
2. Gravitational force: This force specifically refers to the force of gravity acting on an object. While it is an essential force to consider, it may not represent the sum of all forces acting on the object in every scenario.
3. Acceleration: Unlike the other options, acceleration is not a force but rather a change in an object's velocity. While it is related to the sum of forces acting on an object (according to Newton's second law), it is not the same as the net force.
4. Scalar sum: This term suggests adding the magnitudes of the forces acting on an object without considering their individual directions. However, since forces are vector quantities, it is important to consider both magnitude and direction, making this option incorrect.
To determine the correct answer, we need to consider the definition of net force, which is the overall force on an object obtained by summing up all the individual forces acting upon it. Furthermore, we know that net forces are represented as vector sums since they have both magnitude and direction. Therefore, the correct option is "net force, which is a vector sum."