Forces & Motion

An unbalanced force occurs when...

• Two forces acting on an object are not equal in size -object will move in the direction of the stronger force

• Two forces acting on an object are equal in size but act in opposite directions -object will be stationary

All of the following are unbalanced forces EXCEPT...

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All of the following are examples of balanced forces EXCEPT...

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Friction is...

• Resistance to motion, a force that slows objects down or stops an object from moving.

• A force that holds or pulls all objects to the ground, even when the object is at rest.

• Two forces acting on an object are not equal in size -object will move in the direction of the stronger force

• Two forces acting on an object are equal in size but act in opposite directions -object will be stationary

Aiden wants to investigate which surface will allow him to slide the furthest or has the least amount of friction. Which surface would have the least amount of friction?

• Ice

• Grass

• Carpet

• Concrete

Ivey was wondering why when she sits in a chair she doesn't float away. What's keeping her in the chair?

• The air

• Gravity, because it is a force that holds or pulls all objects to the ground, even when the object is at rest.

• The temperature

• The chair

Multiple selection: Select all of the examples of gravitational force.

• The force that causes a ball you kick in the air to come down again.

• Tree roots growing downwards

• An astronaut floating in space or experiencing zero gravity

• The force that causes lighter objects to fall slower than heavier objects.

Why did the watermelon hit the ground faster than the ping pong ball during the investigation?

• Because heavier objects or objects with more mass will fall to the ground more quickly. This is because gravity is applying more force to heavier objects.

• Because lighter objects will hit the ground more quickly. Gravity is applying more force to lighter objects.

Jordan wants to move a refrigerator that's arrived at the front door to the kitchen using a wheel & axel. Which question should Jordan ask to move the refrigerator from the front door to the kitchen

• Will I need to elevate the refrigerator from the sidewalk into the front door?

• Will I need to constantly keep the door open without shutting?

• Will I need to roll the refrigerator from the front door to the kitchen?

• Will I need to elevate the refrigerator to bring it inside the house?

What question could I ask to determine if a see-saw is a lever?

• How does a wedge on a seesaw stay in place to lift up a student?

• Does a seesaw lift and lower a student through a rope and wheel system?

• Will a seesaw lift up a student by rotating with a wheel rotating around a rod?

• Is a seesaw supported by a fulcrum to lift up a student?