IGS Ph N's 2nd

Which variables affect the size of an object's acceleration?

Choose two options.

• The object's mass.

• How fast the object is moving.

• The resultant force acting on the object.

• The size of the object.

One of the things Newton's 2nd law states is that "an object's acceleration is .................................................. to the resultant force acting on the object".

• inversely proportional

• directly proportional

• correlated

• directly correlated

"An object's acceleration is directly proportional to the resultant force acting on the object" means ...

(Choose two options)

• If the resultant force doubles the acceleration will double.

• If the resultant force doubles the acceleration will halve.

• If the resultant force increases 4 times the acceleration will be a quarter of what it was.

If the mass of an object is doubled, its acceleration will halve.

What's the technical description of this relationship?

• Acceleration has a negative correlation with mass.

• Acceleration is inversely proportional to mass.

• Acceleration is directly proportional to mass.

• Acceleration has a positive correlation with mass.

This equation comes from N's 2nd law.

What is "F" the symbol for?

(Careful!)

• force

• resultant force

• mass

• acceleration

This equation comes from N's 2nd law.

What is "m" the symbol for?

• force

• resultant force

• mass

• acceleration

This equation comes from N's 2nd law.

What is "a" the symbol for?

• force

• resultant force

• mass

• acceleration

The unit for force is "newton (N)".

The unit for mass is "kilogram (kg)".

What's the unit for acceleration?

• newton (N)

• metre per second (m/s)

• metre per second²

  (m/s²)

• kilogram (kg)

The diagram shows an object accelerating at 10 m/s².

The object's mass is 2 kg.

Calculate the resultant force, F, acting on the object.

(Use the equation. You can use a calculator if you want.)

• 0.2 N

• 5 N

• 20 N

The diagram shows an object accelerating at 15 m/s².

The object's mass is 3 kg.

Calculate the resultant force, F, acting on the object.

• 45 N

• 5 N

• 0.2 N