Review: Newton second law F=ma examples

What does F=ma stand for?

F is force, m is mass, and a is acceleration. It shows how force affects motion.

Define force in physics.

A push or pull acting on an object, measured in newtons (N).

Fill in the blank: Acceleration is measured in _____ per second squared.

meters per second squared (m/s²).

True or false: Mass is the same as weight.

False, because mass measures matter in kg, while weight measures gravitational force.

Difference between mass and weight.

Mass is the amount of matter (kg), while weight is the force of gravity on that mass (N).

What is the SI unit of force?

The newton (N), defined as kg·m/s².

Calculate the force: m=10 kg, a=2 m/s².

F = m × a = 10 kg × 2 m/s² = 20 N.

What does acceleration depend on?

Acceleration depends on the net force acting on an object and its mass.

What happens if the mass increases but force stays the same?

Acceleration decreases, as $\displaystyle a = \\frac{F}{m}$.

True or false: A heavier object always falls faster.

False, because air resistance affects falling speed.

What is the formula for acceleration?

Acceleration is calculated using $\displaystyle a = \\frac{F}{m}$.

Example of F=ma in daily life.

Pushing a shopping cart: more force means faster acceleration.

Difference between balanced and unbalanced forces.

Balanced forces do not change motion; unbalanced forces cause acceleration.

Fill in the blank: 1 N equals _____ kg·m/s².

1 N equals 1 kg·m/s².

What acceleration results from a 50 N force on 25 kg?

Using $\displaystyle a = \\frac{F}{m}$, $\displaystyle a = \\frac{50}{25} = 2$ m/s².

True or false: Force can act without causing motion.

True, because static friction can counteract force.

Which object has more inertia?

A truck has more inertia than a bicycle due to its greater mass.