Newton's 1st, 2nd, & 3rd laws of motion

[xLuvux]

a) A shirt left on your bedroom floor is still there after 2 days. (Newton's 1 law)

b) You run into your friend while ice-skating, & you both fall in opposite directions. (3rd law)

c) The horse you're riding trips on a tree stump & stops quickly, & you fly forward. (1st law)

d) A baseball continues rolling until it hits the fence. (1st law)

e) You hit a tennis ball w/ a tennis racket & the tennis ball sails over the net. (3rd law)

f) A person jumps off a diving board. (3rd law)

g) A swimmer swims through the water. (3rd law)

h) F=ma (Newton's 2nd law) Can someone please check if I'm correct. Thank you.

 

[BruceW]

they all look right to me.

 

[Andrew Mason]

There is more than one correct answer here. Here is my take:

a) A shirt left on your bedroom floor is still there after 2 days. (Newton's 1 law)

No net force: First law.

b) You run into your friend while ice-skating, & you both fall in opposite directions. (3rd law)

Net force down + collision: Second and third laws.

c) The horse you're riding trips on a tree stump & stops quickly, & you fly forward. (1st law)

No net force (ignoring gravity): First law.

d) A baseball continues rolling until it hits the fence. (1st law)

No net force (ignoring friction): First law.

e) You hit a tennis ball w/ a tennis racket & the tennis ball sails over the net. (3rd law)

Impulse imparted to ball by racket: I = Δp = FΔt; Second law.

f) A person jumps off a diving board. (3rd law)

Impulse imparted to diver by diving board: I = Δp = FΔt; Diver goes up and gravity brings diver down. Second law.

g) A swimmer swims through the water. (3rd law)

Swimmer's body pushes back on water moving water backward and swimmer forward; swimmer meets fluid resistance exactly equal to push of swimmer's body on water; 0 net force so swimmer moves at constant speed through water. First and third laws apply.

h) F=ma (Newton's 2nd law)

Second law if f≠0, but first law if f = 0;AM

 

[xLuvux]

There is more than one correct answer here. Here is my take:

No net force: First law.
Net force down + collision: Second and third laws.
No net force (ignoring gravity): First law.
No net force (ignoring friction): First law.
Impulse imparted to ball by racket: I = Δp = FΔt; Second law.
Impulse imparted to diver by diving board: I = Δp = FΔt; Diver goes up and gravity brings diver down. Second law.
Swimmer's body pushes back on water moving water backward and swimmer forward; swimmer meets fluid resistance exactly equal to push of swimmer's body on water; 0 net force so swimmer moves at constant speed through water. First and third laws apply.
Second law if f≠0, but first law if f = 0;


AM

Thank you.

 

[asteriatic]

a) This situation demonstrates Newton's 1st law of motion, also known as the law of inertia. The shirt remains at rest on the bedroom floor because it has no external forces acting upon it to change its state of motion.

b) The scenario of two people falling in opposite directions after colliding while ice-skating is a perfect example of Newton's 3rd law of motion, also known as the law of action and reaction. The force exerted by one person on the other causes an equal and opposite reaction, causing both individuals to fall in opposite directions.

c) In this situation, the horse tripping on a tree stump and the rider flying forward demonstrate Newton's 1st law of motion. The rider's body continues to move forward due to its inertia, while the horse stops abruptly due to the external force of the tree stump.

d) The baseball continuing to roll until it hits the fence is an example of Newton's 1st law of motion. The ball remains in motion due to its inertia until an external force, in this case, the fence, acts upon it and changes its state of motion.

e) This scenario demonstrates Newton's 3rd law of motion. The force exerted by the tennis racket on the ball causes an equal and opposite reaction, propelling the ball over the net.

f) The person jumping off a diving board is an example of Newton's 3rd law of motion. The force exerted by the person's feet on the diving board causes an equal and opposite reaction, propelling the person into the air.

g) The swimmer moving through the water is a perfect example of Newton's 3rd law of motion. The force exerted by the swimmer's arms and legs on the water causes an equal and opposite reaction, propelling the swimmer through the water.

h) The equation F=ma represents Newton's 2nd law of motion. This law states that the force exerted on an object is directly proportional to its mass and acceleration. In other words, the greater the mass of an object, the more force is needed to accelerate it.