Physical Science: Forces and Momentum

An object's momentum can be defined as an object's:

• mass times its acceleration
• mass times its velocity
• force times its acceleration
• force times the time interval

As an object falls through the air, the forces acting on the object are:

• air resistance and fluid friction

• gravity and air resistance

• gravity and static friction

• weight and rolling friction

An object's tenancy to stay at rest is called its ___.

• force

• momentum

• inertia

• motion

Is the following situation an example of balanced or unbalanced forces:

You are in a tug-of-war match with your twin and it is a tie.

• Balanced

• Unbalanced

Is the following situation an example of balanced or unbalanced forces:

A box that weighs 60-N falls through the air and encounters 80-N of air resistance.

• Balanced

• Unbalanced

Is the following situation an example of balanced or unbalanced forces:

A worker is pushing a crate with a 42-N force, and friction is resisting with 20-N.

• Balanced

• Unbalanced

A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 

• 55 kg*m/s
• 100 kg*m/s
• 250 kg*m/s
• 500 kg*m/s

What is the net force?

• 65 N left
• 65 N right
• 35 N left
• 35 N right

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

When an object is in terminal velocity, the object falls __.

• at a constant rate

• faster and faster

• slower and slower

If a 10 kilogram object accelerates suddenly at 15 m/s^2, approximately how much force was applied to the object?

• 150 Newtons

• 15 Newtons

• 150 kilograms

• 100 kilograms