Question

multiple answer 3 points imagine a playground where children are playing with various toys that involve forces, such as a soccer ball, a swing, a seesaw, and a frisbee. check all the statements that accurately describe the forces acting on objects in the playground. select all that apply. the swing moving back and forth experiences gravity pulling it downwards. the seesaw remains balanced when two children of equal weight sit on opposite ends due to equal and opposite applied forces. the child pushing another child on the swing is applying an applied force that begins the swings motion. the soccer ball rolling across the grass experiences friction that keeps it rolling. the frisbee flying through the air experiences no forces acting on it until it is caught. multiple choice 1 point what happens when you push a stationary skateboard, and it starts to move? the skateboard and the direction it is pushed is shown.

Explanation:

• For the first question (multiple - choice): When you push a stationary skateboard and it starts to move, according to Newton's first law of motion, an object at rest will stay at rest unless acted upon by an external force. Here, the push is the external force that overcomes the initial state of rest.
• For the second question (multiple - answer):
• The swing moving back and forth: Gravity acts as a restoring force. When the swing is at a height, gravity pulls it downwards, causing the back - and - forth motion.
• The seesaw remaining balanced when two children of equal weight sit on opposite ends: According to the principle of moments (\(F_1\times d_1=F_2\times d_2\)), when \(F_1 = F_2\) (equal weights) and \(d_1 = d_2\) (symmetric positions on the seesaw), the net torque is zero, and the seesaw is balanced. This is an example of equal and opposite forces (weights) acting at equal distances from the pivot.
• The child pushing another child on the swing: The pushing is an applied force. When a child pushes another on the swing, this applied force changes the state of motion of the swing (either starting the motion or changing its speed).

Answer:

• Question 2 (multiple - answer): The swing moving back and forth experiences gravity pulling it downwards; The seesaw remains balanced when two children of equal weight sit on opposite ends due to equal and opposite applied forces; The child pushing another child on the swing is applying an applied force that begins the swing's motion.
• Question 3 (multiple - choice): The skateboard starts to move because an external force (the push) is applied to it, changing its state from rest to motion.