Forces and Momentum

The force that acts in the opposite direction of motion when two surfaces come in contact. 

• Force

• Friction

• Static

• Kinetic 

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

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

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

Tags

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-2

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

Tags

NGSS.MS-PS2-2

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

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

Tags

NGSS.MS-PS2-2

A 50 kg skater pushed by a friend accelerates 5 m/s². Approximately how much force did the friend apply?

• 250 N

• 250 m/s²

• 250 kg

Tags

NGSS.MS-PS2-2