uiz #4 Newtons second law and free fall F2024

Front

What is Newton's Second Law of Motion?

Back

Newton's Second Law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be expressed with the formula F = ma, where F is the force, m is the mass, and a is the acceleration.

Front

What happens to the acceleration of a falling object when it encounters air resistance?

Back

The acceleration of a falling object decreases when it encounters air resistance, making it less than the acceleration due to gravity (g).

Front

How do you calculate force using mass and acceleration?

Back

Force can be calculated using the formula F = ma, where F is the force in Newtons, m is the mass in kilograms, and a is the acceleration in meters per second squared.

Front

What is the unit of force in the International System of Units (SI)?

Back

The unit of force in the SI system is the Newton (N).

Front

If a wagon has a mass of 45 kg and accelerates at 0.85 m/s², what is the force acting on it?

Back

The force acting on the wagon is 38.25 N, calculated using F = ma (F = 45 kg * 0.85 m/s²).

Front

What is the relationship between force and acceleration?

Back

The relationship is that as the acceleration of an object increases, the force acting on it must also increase, assuming mass remains constant.

Front

What is free fall?

Back

Free fall is the motion of an object under the influence of gravitational force only, with no other forces acting on it, such as air resistance.

Front

How does mass affect the acceleration of an object when a constant force is applied?

Back

When a constant force is applied, an increase in mass results in a decrease in acceleration, according to Newton's Second Law (F = ma).

Front

What is the velocity of an object in free fall after 5 seconds, assuming g = 10 m/s²?

Back

The velocity after 5 seconds is 50 m/s, calculated using the formula v = gt (v = 10 m/s² * 5 s).

Front

What is air resistance?

Back

Air resistance is a type of frictional force that opposes the motion of an object through the air, affecting its acceleration and velocity.