An apple is thrown upwards. Which of the following force diagrams best models the forces acting on the apple after it has left the person’s hand and while it’s moving upwards?
Responses
An apple with two opposing forces. A vector showing throw force (person on apple) is equal to a vector showing gravitational force (Earth on apple).
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An apple with two opposing forces. A vector showing throw force (person on apple) is shorter than a vector showing gravitational force (Earth on apple).
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veronchick84/Shutterstock
An apple with one force vector showing gravitational force (Earth on apple) pointing down.
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veronchick84/Shutterstock
An apple with two opposing forces. A vector showing throw force (person on apple) is longer than a vector showing gravitational force (Earth on apple).
Labels and arrows added by FlipSwitch.
veronchick84/Shutterstock
The correct response is:
An apple with two opposing forces. A vector showing throw force (person on apple) is equal to a vector showing gravitational force (Earth on apple).
Labels and arrows added by FlipSwitch.
veronchick84/Shutterstock
thx can u help with this one?
Study the scenario.
A toy car is pushed across the floor with a force of 4 N to the right. There is 1 N of friction acting on the car to the left.
What is the net force acting on the car?
Responses
3 N
4 N
0.25 N
5 N
The net force acting on the car is found by subtracting the force of friction from the applied force.
Applied force = 4 N (to the right)
Force of friction = 1 N (to the left)
Net force = Applied force - Force of friction
Net force = 4 N - 1 N
Net force = 3 N
Therefore, the net force acting on the car is 3 N.
Response: 3 N
A 50 kg skydiver is falling downwards and accelerating 6 m/s2 down. What is the net force on the skydiver?
Responses
300 N, up
500 N, up
300 N, down
8.3 N, down
The net force acting on an object can be calculated using Newton's second law of motion:
Net force = mass x acceleration
Given:
Mass of the skydiver = 50 kg
Acceleration of the skydiver = 6 m/s²
Net force = 50 kg x 6 m/s²
Net force = 300 N
Therefore, the net force on the skydiver is 300 N, down.
Response: 300 N, down
The correct force diagram that best models the forces acting on the apple after it has left the person's hand and while it's moving upwards is:
An apple with two opposing forces. A vector showing throw force (person on apple) is equal to a vector showing gravitational force (Earth on apple).
To determine the best force diagram that models the forces acting on the apple after it has left the person's hand and while it's moving upwards, we need to consider the forces involved.
1. Gravitational Force: This force always acts downwards towards the center of the Earth.
2. Throw Force: This force was initially applied by the person throwing the apple, propelling it upwards.
Since the apple is moving upwards, the gravitational force is acting downwards and the throw force is acting upwards. Therefore, the best force diagram would show two opposing forces.
Now let's evaluate the options:
- Option 1: An apple with two opposing forces. A vector showing throw force (person on apple) is equal to a vector showing gravitational force (Earth on apple).
This option suggests that the throw force is equal to the gravitational force. This is incorrect because the throw force provided the initial upward motion, which is counteracted by the gravitational force pulling the apple downwards. Therefore, the throw force should be greater than the gravitational force. This option is not correct.
- Option 2: An apple with two opposing forces. A vector showing throw force (person on apple) is shorter than a vector showing gravitational force (Earth on apple).
This option suggests that the throw force is shorter than the gravitational force. This is incorrect because the apple is moving upwards, indicating that the throw force must be greater than the gravitational force. This option is not correct.
- Option 3: An apple with one force vector showing gravitational force (Earth on apple) pointing down.
This option only shows the gravitational force acting downwards. It does not include the throw force acting upwards. Therefore, this option is not correct.
- Option 4: An apple with two opposing forces. A vector showing throw force (person on apple) is longer than a vector showing gravitational force (Earth on apple).
This option correctly shows two opposing forces – the throw force acting upwards and the gravitational force acting downwards. As the apple is moving upwards, the throw force should indeed be longer or greater than the gravitational force. This option is correct.
Therefore, the best force diagram that models the forces acting on the apple after it has left the person's hand and while it's moving upwards is the one described in Option 4.