7. Why does a parachute slow down a skydiver's fall? A) It increases friction B) It reduces upthrust (C) It increases air resistance 8. Which force is exerted between two surfaces in contact? A) Gravity B) Friction C)Upthrust

7. C8. B

## Step1For question 7, we need to understand why a parachute slows down a skydiver's fall. The function of a parachute is to increase air resistance, also known as drag. This is done by increasing the surface area of the skydiver that is in contact with the air. ## Step2The increased air resistance creates a force that opposes the downward force of gravity. This results in a slower descent. The parachute does not increase friction, as friction is a force that opposes motion between two surfaces in contact. It also does not reduce upthrust. Upthrust is the force that opposes the weight of an object in a fluid, and reducing it would not necessarily slow down the fall.## Step3For question 8, we need to identify the force that is exerted between two surfaces in contact. This force is known as friction. ## Step4Friction is the force that opposes the motion of one surface over another. It is not gravity, which is the force that attracts two objects towards each other. It is also not upthrust, which is the force that opposes the weight of an object in a fluid.