Types of Forces

If an object is in free fall, what is the force that is acting upon that object and causing it to move downward.

• Normal

• Gravity

• Applied

• Air Resistance

Answer explanation

Gravity is a force that acts at a distance. It is the force that pulls objects toward the center of Earth during free fall.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

If an object is at rest on a flat surface, there is always gravity pulling down and the normal force pushing up. Which force is greater?

• Gravity

• Normal Force

• It depends on what the object is.

• Both forces are equal.

Answer explanation

If the object is at rest that means the object has balanced forces. Balanced forces = Zero Net Force.

What unit is used to measure forces?

• Meter

• Newton

• Meter per Second

• Gram

Answer explanation

SI Unit for force is the Newton abbreviated "N".

Which of these is NOT usually considered tension when a force is applied to its ends?

• Rope

• Cable

• Wire

• Spring

Answer explanation

Spring is it's own type of force called Spring Force.

If an object is on a sloped surface of 45 degrees, in which direction is the normal force?

• Straight Down

• Perpendicular to the Surface

• Parallel to the Surface

• Straight Up

Answer explanation

It makes sense that normal force is perpendicular to the surface since the normal force is what prevents solid objects from passing through each other.

If a 30 kg bicycle, a 400 kg car, and a 5000 kg train are all traveling at 10 m/s at a specific time, and they don't accelerate or brake, which one will have the greatest frictional force acting upon it?

• The bicycle

• The car

• The train

• They all would have the same.

Answer explanation

The train due to the greater mass.

Tags

NGSS.MS-PS2-2

Friction acts in a direction __________ to the direction of an object's motion.

• equal

• opposite

• unrelated

• perpendicular

Answer explanation

Friction opposes motion and works against it.

A (n) ______________ can cause an objects motion to change

• Balanced Force

• Unbalanced Force

Answer explanation

Unbalanced = a change in motion. Balanced = no change in motion.

Tags

NGSS.MS-PS2-2

Which of the following is NOT a type of force?

• Heat

• Magnetic

• Electric

• Air Resistance

Answer explanation

Heat is a form of energy not a force.

Tags

NGSS.MS-PS2-3

A force can cause an object to _________.

• accelerate

• slow down

• speed up

• change direction

• All of these answers are correct.

Answer explanation

A force can change an objects motion.

Tags

NGSS.MS-PS2-2