Gravity and Friction

FRICTION &FRICTION &
GRAVITYGRAVITY

Physical Science 5

Exploring Contact and Non-Contact Force

FORCEFORCE

Force is a concept that describes
the interaction between two
objects that can change the motion
of one or both of them.

In simpler terms, force is a push or
pull that can cause an object to
move, stop, or change direction.

Friction is a force that happens when two surfaces rub against each

other. It's like a sticky force that can make things harder to move

smoothly. There are four types of friction, namely:

Static

Sliding

Rolling

Fluid

Multiple Choice

Force between two surfaces that are sliding is known as

• magnetism

• friction

• electric force

• I don't know

Multiple Choice

If you kick a soccer ball, it goes up to a certain distance and stops. This happens due to

• gravity

• magnetism

• friction

• weight

Multiple Choice

On which surface would a ball move slowly?

• carpet

• marble floor

• wooden floor

• I don't know

Multiple Choice

Rough surfaces have

• more friction

• less friction

• same level of friction

• I don't know

Multiple Choice

Which type of friction is shown in the picture?

• rolling

• fluid

• static

• sliding

Multiple Choice

Which type of friction is shown in the picture?

• fluid

• static

• rolling

• sliding

Multiple Choice

Which type of friction is shown in the picture?

• rolling

• static

• fluid

• sliding

Multiple Choice

This photo represents...

• Air resistance

• water resistance

• friction force between 2 solid bodies

Static friction happens when an object is
not moving and is touching a surface. This
friction keeps the object from sliding or

moving on the surface it's resting on.

For example, static friction is what keeps

a block from sliding or moving on the

table when it's not being pushed or pulled.

Multiple Choice

Dolphins have streamline shape to.............

• increase water resistance.

• Decrease water resistance.

• No answer

Multiple Select

Which boy A or B will slide down faster

• A

• B

• A and B

Multiple Choice

_____________ friction acts on objects that are not moving.

• sliding

• rolling

• static

• fluid

Sliding friction is a type of friction that
happens when two objects slide past

each other.

For example, when you pull a block, sliding
friction takes over. Sliding friction is the
force that resists motion as the block

slides across a surface.

Rolling friction is a type of friction that
occurs when a round object, like a ball or

a wheel, rolls over a surface.

For example, the surface of the bowling
ball and the surface of the bowling lane

have tiny bumps and ridges that rub

against each other and create friction.

Multiple Choice

Sliding friction is when two _____________ surfaces slide over one another.

• liquid

• oil

• solid

Fluid friction is a type of friction that

happens when an object moves through a

fluid, such as air or water.

For example, when a parachute is open. It

creates air resistance and slows you
down. The air is fluid, and it creates a

force that resists your motion through it.

Gravity is a force that pulls objects towards each other. It is what
makes things fall down to the ground and keeps the planets in our

solar system in their orbits around the sun. Gravity is:

Attracting

Universal

Non-contact

Grounding

Gravity is a special force that exists in
the universe. It's like a "pulling" force that
makes objects move towards each other.

This means that if you drop an apple, it

will fall down to the ground because
gravity is pulling it towards the Earth.

The Universal Law of Gravitation is a rule

that explains how gravity works in the

entire universe.

The Law says that every object in the
universe, no matter how big or small, is
attracted to every other object in the

universe.

Gravity is a force that exists between
objects, even if they are not touching

each other.

When you drop the ball, it falls to the
ground. The reason this happens is

because of gravity. The Earth is pulling on
the ball, even though it's not touching it.

When we are standing on the ground,
the force of gravity is pulling us down

towards the center of the Earth.

This force of gravity is what keeps us

on the ground. Without gravity, we

would all float away into space!

Multiple Choice

What is the definition of static friction?

• The friction that occurs when an object rolls over a surface.

• The friction that occurs when an object moves through a fluid.

• The friction that prevents an object from moving when a force is applied.

• The friction that occurs when two surfaces slide past each other.

Multiple Choice

Which type of friction is experienced by a car tire rolling on the road?

• Static Friction

• Rolling Friction

• Fluid Friction

• Sliding Friction

Multiple Choice

What is fluid friction?

• The friction that occurs when an object rolls over a surface.

• The friction that occurs when an object moves through a liquid or gas.

• The friction that prevents an object from moving when a force is applied.

• The friction that occurs when two surfaces slide past each other.

Multiple Choice

Which type of friction is associated with the greatest force?

• sliding friction

• static friction

• rolling friction

• fluid friction

Multiple Choice

How does increasing the roughness of a surface affect friction?

• It decreases friction.

• It has no effect on friction.

• It increases friction.

• It changes the type of friction.

Multiple Choice

Compare and contrast rolling friction and sliding friction.

• Rolling friction is usually greater than sliding friction.

• Rolling friction occurs when objects slide past each other, while sliding friction occurs when objects roll.

• Rolling friction is usually less than sliding friction.

• Rolling friction and sliding friction are the same.

Multiple Choice

Weight is a force that depends on mass and:

• friction

• gravity

• magnetism

• energy

Multiple Choice

Compared to your weight and mass on Earth, if you were on the moon:

• your weight and mass would be less.

• your weight would be less but your mass would remain the same.

• your weight would remain the same, but your mass would be less.

• your weight would be greater, but your mass would remain the same.

Multiple Choice

The picture shows a force vector arrow pointing down. The best name for this downward force is:

• gravity

• drag

• buoyancy

• friction

Multiple Choice

The correct equation to solve for weight in Newtons is:

• W = m/g

• W = g/m

• W = grams

• W = mg

Multiple Choice

This diagram shows three models that represent the gravitational force, F, between objects.

Which model is displaying the most gravitational force of attraction?

• Model 1

• Model 2

• Model 3

Multiple Choice

This diagram shows three models that represent the gravitational force, F, between objects.

What do the arrows represent in the models?

• the mass of the objects

• the direction of the force

• the direction the object will be pushed

Multiple Choice

Newton's Universal Law of Gravitation claims that the attraction between objects with mass depend on what 2 things?

• volume and height

• velocity and height

• acceleration and mass

• mass and distance

Multiple Choice

Which planet has the weakest gravitational pull?

• Earth

• Mercury

• Jupiter

• Venus

Match

Match the following concepts with their correct units

• mass

• velocity

• acceleration

• distance

• Weight

kg

m/s

m/s2

m

N

• kg

• m/s

• m/s2

• m

• N

Multiple Choice

Which System has the greater gravitational pull between the two objects?

• System 1
• System 2
• Same: there is no gravitational attraction between the two objects

Multiple Choice

A person would weigh less on on the Moon than on the Earth because . . .

• Moon has more mass, and therefore more gravity
• Moon has less mass, and therefore more gravity
• Moon has more mass, and therefore less gravity
• Moon has less mass and therefore less gravity