Question

please help me guys​

Answer 1

♠ FOLLOW ♠

1) Answer:

♦The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia.

♦ Newton's first law of motion is often stated as.

♦ An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

2) Answer:

♦In equation form, Newton's second law of motion is a=√Fnetm a = F net m .

♦This is often written in the more familiar form: Fnet = ma.

♦The weight w of an object is defined as the force of gravity acting on an object of mass m. ...

♦If the only force acting on an object is due to gravity, the object is in free fall.

3) Answer:

♦Mass of the hammer, m = 500 g = 0.5 kg

Initial velocity of the hammer, u = 50 m/s

Time taken by the nail to the stop the hammer, t = 0.01 s

Velocity of the hammer, v = 0 (since the hammer finally comes to rest)

From Newton’s second law of motion:

Force, f = m(v-u) / t

= 0.5(0-50) / 0.01

= -2500 N

♦The hammer strikes the nail with a force of 2500 N. Hence, from Newton’s third law of motion, the force of the nail on the hammer is equal and opposite, i.e., +2500 N.