Newton's Laws of Motion and Free Body Diagrams

Which example best explains Newton's Third Law of Motion?

• When a glass slid across a table, it spilled water when it stopped suddenly.

• An engine used less work to move a lighter car than when it moved a heavier car.

• When you sit on a chair, your body exerts a downward force on the surface of the chair, while the chair exerts an equal and upward force on your body. 

A truck that is travelling at a constant speed is carrying some boxes.  If the truck comes to a sudden stop, what will most likely happen to the boxes?

• They will stay in the middle of the truck.

• They will slide toward the front of the truck.

• They will slide toward the back of the truck.

• They will fall off the side of the truck.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Object X has twice the mass of Object Y.  Both objects are accelerating at the same rate.  Which statement best describes the motions of Object X and Object Y.

• Object X is travelling at twice the speed as Object Y.

• Object X is travelling at half the speed as Object Y.

• Object X requires twice the force to accelerate at the same rate as Object Y.

• Object X requires half the force to accelerate at the same rate as Object Y.

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NGSS.MS-PS2-2

The soccer ball is sitting on the half line and Zach runs up to kick it.  What law will occur when he kicks it?

• An object at rest will remain at rest unless acted on by an unbalanced force.

• An object will remain motionless until it decides to move.

• The harder Zack kicks the ball, the less distance it will travel.

• Time travel has always been possible.  You just have to believe.

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NGSS.MS-PS2-2

NGSS.MS-PS3-5

There is a natural tendency of objects to ________ .  All objects resist changes in their motion.

• keep doing what they are doing

• love to stop what they're doing and change

• accelerate slowly

• to do what they are told

Tags

NGSS.HS-PS2-1

In which situation is the object experiencing balanced forces?

• A sky diver reaches terminal velocity when he stops accelerating

• A car brakes as it approaches a traffic light

• A girl swings on a swing at the playground

• A sled speeds up as it slides down a snow-covered hill

A leftward force is applied to a crate to push it across the floor at a constant speed. Which is the correct force diagram?

• 
• 
• 
• 

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NGSS.MS-PS2-2

Which way is the object moving?

• it's either not moving or moving at a constant speed due to balanced forces

• to the right

• to the bottom

• up

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NGSS.MS-PS2-2

A student pushes a box to right with a force of 10N while a young boy pushes the box to the left with a force of 8N. What is the sum of all forces on the box?

• 18N left

• 18N right

• 2N right

• 2N left

Tags

NGSS.MS-PS2-2

Which type of force(s) will cause a change in an object's motion?

• gravity

• zero net force

• balanced forces

• unbalanced forces

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NGSS.MS-PS2-2