Which of the following best describes the sum of all forces acting on an object?
gravitational force, which is a vector sum gravitational force, which is a vector sum net force, which is a scalar sum net force, which is a scalar sum acceleration, which is a vector sum acceleration, which is a vector sum net force, which is a vector sum
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?
50 N 50 N 250 N 250 N 50 kg 50 kg -50 N
The net force of this system can be calculated by summing up the forces acting on the object:
Net force = downward force + upward force
= -100 N + 150 N
= 50 N
Therefore, 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?
20 m/s2 20 m/s2 20 N 20 N 120 N 120 N -20 N
To determine the net force of this system, we need to calculate the vector sum of the forces involved:
Net force = force moving left + force moving right
= 70 N + (-50 N)
= 20 N
Therefore, the net force of this system is 20 N.
Recall that the formula for momentum is: P=mv Which of the following correctly shows momentum being calculated?
14 kg*/s=(9 kg) (5 m/s)s 14 kg * / s = ( 9 kg ) ( 5 m / s ) 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 ) 45 kg*m/s=(9 kg) (5 m/s)
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?
P=8*10−4 kg*m/s P = 8 * 10 - 4 kg * m / s P=18 kg*m/s P = 18 kg * m / s M=18 kg*m/s M = 18 kg * m / s P=18 N
To calculate the momentum of the hockey puck, we can use the formula P = mv, where P is momentum, m is mass, and v is velocity.
Given:
Mass (m) = 0.12 kg
Velocity (v) = 150 m/s
P = (0.12 kg) * (150 m/s)
P = 18 kg*m/s
Therefore, the momentum of the hockey puck is 18 kg*m/s.
The correct answer is net force, which is a vector sum.
To determine the sum of all forces acting on an object, you need to consider both the magnitude and direction of each force. Forces are vector quantities, meaning they have both magnitude and direction.
In this case, you have a list of options, and you need to identify which one represents the correct description. Let's analyze each option:
1. Gravitational force, which is a vector sum: This option is incorrect because gravity alone is just one of the forces acting on an object. It does not represent the sum of all forces.
2. Gravitational force, which is a vector sum: This option is the same as the first one and is also incorrect for the same reasons.
3. Net force, which is a scalar sum: This option is incorrect because net force is a vector sum, not a scalar sum. Scalar quantities only have magnitude, while vectors have magnitude and direction.
4. Net force, which is a scalar sum: This option is incorrect for the same reasons as the third one.
5. Acceleration, which is a vector sum: This option is incorrect because acceleration is not the sum of forces but rather the result of applying forces to an object. Acceleration represents the change in velocity per unit of time and is directly proportional to the net force acting on the object.
6. Net force, which is a vector sum: This option is the correct answer. The net force is the sum of all forces acting on an object, taking into account both their magnitudes and directions. It determines the overall effect of the forces on the object's motion.
Therefore, the correct option is "net force, which is a vector sum."