8th-T1 L4: Friction and Gravitational Interactions Lesson

Draw

Circle two areas that show what causes the bike to slow down.

What force stops the bicycle? Is it a contact or non-contact force?

Open Ended

What force stops the bicycle? Is it a contact or non-contact force?

Multiple Choice

What is friction?

• when two materials are rubbed together and exert energy on each other

• when something slides on something

• when something feels rough

Multiple Choice

Is friction a contact or non-contact force?

• contact

• non contact

Poll

Which tire do you think has more friction?

• 1

• 3

Multiple Choice

Which tire would have the best friction for riding on a mountain?

​Friction can slow down motion. Give me some scenarios in which less friction is desired.

Open Ended

​Friction can slow down motion. Give me some scenarios in which less friction is desired.

Open Ended

​Friction can also enable motion. What are some examples of when friction is useful?

Open Ended

What is rolling friction?

Multiple Choice

Which is an example of rolling friction?

Open Ended

What is sliding friction?

Multiple Choice

Which is an example of sliding friction?

Multiple Choice

Which is an example of fluid friction?

Multiple Choice

Which is an example of static friction?

​

Multiple Choice

True or false: Gravity is contact force.

• true

• false

Draw

What are some examples of gravity?

Multiple Select

What two factors control the strength of gravity between 2 objects?

• mass

• weight

• distance

Drag and Drop

The more ​

Placeholder

an object has the move ​

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force has.

Drag these tiles and drop them in the correct blank above

mass

gravitational

weight

Drag and Drop

​

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is the measured by how hard gravity pulls the object or person down.

Drag these tiles and drop them in the correct blank above

Weight

mass

gravity

Draw

Where do you think is the greatest gravitational pull?

Draw

Where is the greatest potential energy?

Draw

What force is acting here?