Forces Review

Types of Forces

100

What type of force is the supportive force?

Normal Force

200

What force is exerted on an object by another person or object?

Applied Force

300

What force opposes motion?

Friction Force

400

This force is the invisible pull between two objects.

Gravitational Force

500

What is a diagram called that shows all forces that are acting on an object?

Free-Body Diagram

Free Fall & Forces

100

What is the only force that acts on an object when it is in free fall?

Gravity

200

What is the variable "g" equal to?

g = 9.8 m/s²

300

When an object starts at rest, what is its initial velocity?

0

400

True or False: All objects fall at different rates based on their mass even when there is no air resistance.

False: Objects will fall at the same rate when air resistance is absent

500

An object reaches this when the force of gravity is equal to the air resistance.

Terminal Velocity

Friction

100

This type of friction prevents objects from starting to move

Static Friction

200

This type of friction occurs when objects are already in motion

Kinetic Friction

300

Give an example of static friction

Car parked on a hill, book sitting on a desk, ect.

400

This number represents the "slipperiness" or "grippiness" between two surfaces

Coefficient of Friction

500

A wooden desk decoration has a mass of 0.03kg. It is sliding on a wooden table with a coefficient of kinetic friction of 0.40. How would you calculate the friction force?

Multiply the mass (0.03kg) with g (9.8 m/s²) to find the normal force (F_n). Then multiple the normal force and the coefficient of friction to find the friction force.

Formulas

100

What do the variables represent in this formula:

W = mg

weight = mass * gravity

200

What do the variables represent in this formula:

d = V₀t + 1/2 at²

displacement (distance) = final velocity * time + 1/2 * acceleration * time²

300

What do the variables represent in this formula:

F_n = mg

Normal Force = mass * gravity

400

What do the variables represent in this formula:

V_f = V₀ + gt

final velocity = initial velocity + gravity * time

500

What do the variables represent in this formula:

F_f = μF_n

Friction Force = coefficient of friction * normal force

Misc.

100

What is the difference between mass and weight?

mass = how much "stuff" or matter is in the object

weight = force that is caused by gravity acting on the mass of an object

200

What units do we use to measure weight and mass? (2 different answers for each one!)

weight = Newtons (N)

mass = kilograms (kg)

300

True or False: The force of gravity and the normal force are equal and opposite when an object is sitting at rest on a horizontal surface. 

True

400

If an object is being pushed to the right, what type of force would you label this force as if you were to draw a free-body diagram? 

An Applied Force

500

What unit do we use to label forces?

Newton (N)