Force and Motion Quiz G8 New

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by what?

• friction

• gravity

• external force

• internal force

Answer explanation

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by an external force.

What is the formula to calculate force?

• force = mass x acceleration

• force = mass - acceleration

• force = mass + acceleration

• force = mass / acceleration

Answer explanation

The formula to calculate force is force = mass x acceleration. This equation states that force is equal to the product of mass and acceleration.

What is the unit of force?

• Newton (N)

• Kilogram (kg)

• Meter (m)

• Second (s)

Answer explanation

The unit of force is Newton (N).

What is inertia?

• The ability to move quickly

• The speed of an object

• Resistance to changes in its state of motion

• The force of gravity

Answer explanation

Inertia is the resistance to changes in an object's state of motion. It is the property that keeps an object at rest or in uniform motion unless acted upon by an external force.

According to Newton's second law of motion, what is the relationship between force, mass, and acceleration?

• Force is directly proportional to acceleration but inversely proportional to mass

• Force is inversely proportional to mass and acceleration

• Force is directly proportional to mass and acceleration

• Force is directly proportional to mass but inversely proportional to acceleration

Answer explanation

According to Newton's second law of motion, force is directly proportional to mass and acceleration.

What is the property of inertia that causes a moving object to continue in a straight line at a constant speed?

• Newton's first law of motion

• Law of gravity

• Einstein's theory of relativity

• Archimedes' principle

Answer explanation

The property of inertia that causes a moving object to continue in a straight line at a constant speed is Newton's first law of motion.

What is the formula to calculate acceleration?

• a = (v + u) / t

• a = v * t

• a = (v * u) / t

• a = (v - u) / t

Answer explanation

The formula to calculate acceleration is a = (v - u) / t. This formula represents the change in velocity (v - u) divided by the time taken (t), which gives the rate of change of velocity over time.

What is the property of inertia that causes a stationary object to remain at rest?

• Acceleration

• Inertia

• Friction

• Motion

Answer explanation

Inertia is the property that causes a stationary object to remain at rest. It is the resistance of an object to changes in its motion.

According to Newton's third law of motion, for every action, there is an equal and opposite what?

• unequal reaction

• reaction

• inaction

• random reaction

Answer explanation

According to Newton's third law of motion, the correct choice is 'reaction', as it states that for every action, there is an equal and opposite reaction.

What is the SI unit of mass?

• g

• lb

• m

• kg

Answer explanation

The SI unit of mass is kg, which stands for kilogram. It is the correct choice because it is the base unit for mass in the International System of Units (SI).