Newton's Laws

Newton’s 1st Law of motion is sometimes called the Law of _______.

• Inertia

• Acceleration

• Momentum

• Force

The physical property of matter that affects an object's inertia is:

• Mass

• Volume

• Density

• Temperature

In order for an object to change its motion, what type of force must be acting on it?

• Unbalanced force

• Balanced force

• Frictional force

• Gravitational force

What is a net force?

• sum of all the forces that act upon an object

• product of all the forces applied on the object

• average of the forces acting on the object

• difference between the magnitudes of opposing forces

True or False: An object at rest will have 0 net forces?

• True

• False

What is the total net force acting on this object?

• 3 N down

• 2 N up

• 7 N down

• 1 N up

Answer explanation

3 N down (5 N down – 2 N up = 3 N down)

Define mass

• The amount of matter (atoms/molecules) that makes up an object.

• The volume occupied by an object.

• The force exerted by an object due to gravity.

• The energy contained within an object.

What is the difference between mass and weight?

• Mass is the amount of matter in an object and weight is the effect of gravity on that mass.

• Mass is the effect of gravity and weight is the amount of matter in an object.

• Mass is measured in newtons and weight in kilograms.

• There is no difference between mass and weight.

Weight is a force measured in _____ (weight = mass x gravity).

• Newtons

• Pounds

• Kilograms

• Joules

What is the weight of an object on earth with a mass of 25 kg?

(hint: acceleration of gravity on earth is 9.8 m/s²).

• 245 N

• 245 kg

• 250 N

• 225 N

Answer explanation

(weight = 25 kg x 9.8 m/s²)