# 6th Grade Science Chapter 9 Forces

59 Questions | Total Attempts: 804  Settings  • 1.
A force is simply a [Blank] or [Blank].
• 2.
A force is described by its [Blank] (size) and [Blank].
• 3.
Anytime you see a change in an object's motion, you can be sure that the change in motion was created by a [Blank].
• 4.
Scientists express force by using a unit called the:
• A.

Joule (J)

• B.

Newton (N)

• C.

Kg/m

• D.

Pound (lb)

• 5.
All of these are examples of contact forces EXCEPT:
• A.

Friction

• B.

Buoyant force

• C.

Gravity

• D.

Tension

• 6.
When the buoyant force pushing up on an object is equal to the force of gravity pushing down on the object, the object will sink.
• A.

True

• B.

False

• 7.
If the force of gravity on the object is less than the buoyant force pushing up on the object, the object will sink.
• A.

True

• B.

False

• 8.
Friction happens only between objects that are touching.
• A.

True

• B.

False

• 9.
The amount of friction between two surfaces depends on two main factors. One is how [Blank] the surfaces are that are in contact. The other factor is the [Blank] pushing the surfaces together.
• 10.
When a force is applied to an object but doesn't cause the object to move, [Blank] friction occurs. This is a potential friction.
• 11.
What are the two types of kinetic friction?
• A.

Static and potential

• B.

Tension and sliding

• C.

Rolling and distant

• D.

Sliding and rolling

• 12.
Anything that has wheels uses [Blank] kinetic friction.
• 13.
Friction can be reduced by using/applying lubricants such as motor oil, grease, or wax.
• A.

True

• B.

False

• 14.
Friction can be reduced by switching from rolling friction (wheels) to sliding friction.
• A.

True

• B.

False

• 15.
[Blank] are substances that are applied to surfaces to reduce the friction between the surfaces.
• 16.
One way to increase friction is to make surfaces smoother.
• A.

True

• B.

False

• 17.
[Blank] is a force of attraction between objects that is due to their masses.
• 18.
The Law of Universal Gravitation states that all objects in the universe attract each other through gravitational force.
• A.

True

• B.

False

• 19.
The size of the gravitational force depends on the ___________ of the objects and the ____________________ the objects.
• A.

Distance, size of

• B.

Masses, distance between

• C.

Weight, distance between

• D.

Distance, pull of

• 20.
Gravitational force increases as mass increases.
• A.

True

• B.

False

• 21.
The gravitational force is large between objects that have small masses.
• A.

True

• B.

False

• 22.
The gravitational force is large when the mass of one or both objects is large.
• A.

True

• B.

False

• 23.
Gravitational force increases as distance increases.
• A.

True

• B.

False

• 24.
The gravitational force is strong when the distance between two objects is small.
• A.

True

• B.

False

• 25.
If the distance between two objects increases, the gravitational force pulling them together increases.
• A.

True

• B.

False

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