Force Lecture

Forces

Force

• A push or a pull

• Measured in Newtons

Multiple Choice

What is the name of the units that we measure force in?

• Einsteins 
• Newtons
• Kg
• Metres

Multiple Choice

A contact force is from

• objects physically touching

• far apart objects

• not touching object

• always a pull

Multiple Choice

The three examples pictured are of

• Non-contact Forces

• Contact Forces

Multiple Choice

The force between the phone and the mount is a

• contact force

• non-contact force

Open Ended

How do you think gravity will affect the rate that objects fall? Do you think a bowling ball or a feather would fall faster?

Multiple Choice

Which statement about gravity is true?

• gravity causes objects to pull towards one another

• gravity causes objects to push away from each other

• gravity only takes place between planets

• the moon doesn't have any gravity

Multiple Choice

What two things determine the gravity of an object?

• mass & weight

• mass & distance

• density & mass

• volume & distance

Multiple Choice

What force does a parachute use to slow things down before hitting the ground?

• Friction
• Air resistance
• Water resistance
• Wind

Multiple Choice

Which model has greater gravitational attraction (if any)

• Model A
• Model B
• Both Model A and Model B (same gravity)

Multiple Choice

A person would weigh more on Jupiter than on the Earth because . . .

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

Multiple Choice

It is defined as forces that are not equal in magnitude.

• Unbalanced Forces

• Forces

• Balanced Forces

• Friction

Multiple Choice

If you apply an unbalanced force to an object at rest, what will happen to that object?

• the object will remain at rest.

• the object will move.

• The object will stay.

• None of the above.

Multiple Choice

It is defined as forces that are equal in magnitude.

• Unbalanced Forces

• Forces

• Balanced Forces

• Net force

Multiple Choice

If all forces acting on an object have equal magnitudes, what is the state of that object?

• the object is at rest.

• the object is moving.

• The object is accelerating.

• None of the above.

Multiple Choice

Use the picture as reference. If the force of the girl pushing is 20N, and the boy who is also pushing is 15N, what is the net force?

• 5N

• 300N

• 35N

• 1.33N