Question

In which situation are unbalanced forces acting on an object?(1 point) Responses Two people stand on opposite sides of a large tire. Both people push the tire with equal force. Two people stand on opposite sides of a large tire. Both people push the tire with equal force. Two people stand on the same side of a large tire. Both people pull the tire with equal force. Two people stand on the same side of a large tire. Both people pull the tire with equal force. Two people stand on opposite sides of a large tire. Both people pull the tire with equal force. Two people stand on opposite sides of a large tire. Both people pull the tire with equal force. Two people stand on the same side of a large tire. One person pushes the tire and the other pulls the tire with equal force.

Answer 1

Unbalanced forces act on an object when the forces acting on it are not equal in magnitude and direction.

In the provided responses, the situation where unbalanced forces are acting on the tire is:

"Two people stand on the same side of a large tire. One person pushes the tire and the other pulls the tire with equal force."

In this case, the forces applied are in opposite directions, creating a net force, which means the forces are unbalanced.

Answer 2

What is inertia?(1 point) Responses the motion of an object the motion of an object the speed and direction of an object in motion the speed and direction of an object in motion an object’s resistance to a change its motion an object’s resistance to a change its motion a force that acts on an object at rest a force that acts on an object at rest

Answer 3

Inertia is defined as an object’s resistance to a change in its motion. So the correct response is:

an object’s resistance to a change in its motion.

Answer 4

According to Newton's First law, what happens to a resting object if no external force is acting upon it? * 1 point It remains at rest It moves at a constant velocity It accelerates It changes direction

Answer 5

According to Newton's First Law of Motion, if no external force is acting upon a resting object, it remains at rest.

So the correct response is: It remains at rest.

Answer 6

Four movers pick up boxes. Each box has a different mass, and each mover applies a different amount of force to lift the box. Which box will have the greatest acceleration?(1 point) Responses a 20 kg box lifted with 40 N of force a 20 kg box lifted with 40 N of force a 10 kg box lifted with 60 N of force a 10 kg box lifted with 60 N of force a 10 kg box lifted with 40 N of force a 10 kg box lifted with 40 N of force a 20 kg box lifted with 60 N of force

Answer 7

To determine which box will have the greatest acceleration, we can use Newton's second law of motion, which states that \( F = ma \), where \( F \) is the net force applied to an object, \( m \) is its mass, and \( a \) is its acceleration. From this, we can rearrange the equation to find acceleration:

\[ a = \frac{F}{m} \]

Now, let's calculate the acceleration for each box:

1. 20 kg box lifted with 40 N of force: \[ a = \frac{40 , \text{N}}{20 , \text{kg}} = 2 , \text{m/s}^2 \]

2. 10 kg box lifted with 60 N of force: \[ a = \frac{60 , \text{N}}{10 , \text{kg}} = 6 , \text{m/s}^2 \]

3. 10 kg box lifted with 40 N of force: \[ a = \frac{40 , \text{N}}{10 , \text{kg}} = 4 , \text{m/s}^2 \]

4. 20 kg box lifted with 60 N of force: \[ a = \frac{60 , \text{N}}{20 , \text{kg}} = 3 , \text{m/s}^2 \]

Now, comparing the accelerations:

• 20 kg box with 40 N: \( 2 , \text{m/s}^2 \)
• 10 kg box with 60 N: \( 6 , \text{m/s}^2 \)
• 10 kg box with 40 N: \( 4 , \text{m/s}^2 \)
• 20 kg box with 60 N: \( 3 , \text{m/s}^2 \)

The 10 kg box lifted with 60 N of force has the greatest acceleration of \( 6 , \text{m/s}^2 \). Therefore, the correct response is:

a 10 kg box lifted with 60 N of force.

Answer 8

A baseball has a mass of 145 g. A pitcher throws the baseball so that it accelerates at a rate of 80 m/s2. How much force did the pitcher apply to the baseball?(1 point) Responses 1.8 N 1.8 N 11.6 N 11.6 N 65 N 65 N 0.6 N

Answer 9

To find the force applied to the baseball, we can use Newton's second law of motion, which states:

\[ F = ma \]

Where:

• \( F \) is the force,
• \( m \) is the mass,
• \( a \) is the acceleration.

First, we need to convert the mass of the baseball from grams to kilograms since the SI unit for mass is kilograms:

\[ 145 , \text{g} = 0.145 , \text{kg} \]

Now, we can use the mass and the given acceleration \( a = 80 , \text{m/s}^2 \) to calculate the force:

\[ F = ma = (0.145 , \text{kg}) \times (80 , \text{m/s}^2) = 11.6 , \text{N} \]

Thus, the force that the pitcher applied to the baseball is:

11.6 N

Answer 10

Which situation describes a negative acceleration?(1 point) Responses a runner slowing down at the end of a race a runner slowing down at the end of a race a swimmer moving at a constant velocity a swimmer moving at a constant velocity a bicycle increasing its velocity as the rider pedals harder a bicycle increasing its velocity as the rider pedals harder a diver jumping off a diving board and falling to the swimming pool below

Answer 11

Negative acceleration, also known as deceleration, occurs when an object's speed decreases over time. In the provided responses, the situation that describes negative acceleration is:

a runner slowing down at the end of a race.

This indicates that the runner is reducing their speed, which is a clear example of negative acceleration.