Amplify Force & Motion Mid Unit Review

What are the five ways an object's motion can change?

• Start, stop, speed up, slow down, hit something

• force, friction, mass, velocity, speed

• start, stop, change direction, speed up, slow down

• none of the above (there are only 4 ways)

Alfonso, Julia, and Margie were having fun as they rolled some office chairs across a flat floor. All three chairs have the same mass. Margie gave each of the chairs a push, but not all from the same direction. Each chair changed speed as a result of being pushed. Use the information in the diagram to answer.

Which chair(s) experienced the strongest force when it was pushed? How do you know?

• The black chair experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

• The blue chair experienced the strongest force because it had the fastest ending speed.

• All three chairs experienced the same strength force because they changed speed by the same amount.

• The pink and blue chairs experienced the strongest forces because they both gained the same force as they sped up. The black chair lost force, so it slowed down.

Tags

NGSS.MS-PS2-2

the amount of matter in an object (a)  

• acceleration
• force
• mass
• velocity

A push or pull that can change the motion of an object.

Tags

NGSS.MS-PS2-2

Juno, Melissa, and Anna have skateboards that are the same mass. They were playing with their skateboards on a flat street when another skateboard came along and bumped their skateboards, but not from the same direction. Each skateboard changed speed as a result of being bumped. Use the information in the diagram to answer.

Which skateboard(s) experienced the strongest force when bumped? How do you know?

• The green skateboard experienced the strongest force because it changed speed the most.

• The green skateboard experienced the strongest force because it takes a stronger force to slow something down than it takes to speed something up.

• The red and brown skateboards experienced the same strength force because they both gained forced, but the green skateboard lost force. 

• The red skateboard experienced the strongest force because it has the fastest ending speed.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Match the following

• An object accelerates because a force acts on it.

• 
• An object in motion will stay in motion unless acted upon by an unbalanced force.

• 
• Force is equal to the mass of an object times acceleration

• 
• The larger the mass, the greater the force needed to accelerate it

• An object at rest will stay at rest unless acted upon by an unbalanced force.

• 

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Alice and Kai were playing air hockey, which is a game where players hit a puck with paddles so the puck slides across a table. After the game, they were crashing the puck and two different paddles. The puck was the same in both crashes, but the paddles were different: the red paddle had less mass, while the purple paddle had more mass. Use the information in the diagram to answer.

In which crash did the puck experience a stronger force? Why?

• The puck did not experience a force; only the paddles experienced a force in the crashes.

• Crash 2; the force on the purple paddle was stronger in this crash, so the force on the puck was also stronger.

• The diagram doesn’t tell you anything about the force on the puck. It only gives information about the force on the paddles.

• The puck experienced the same force in both crashes. The paddles changed speed by the same amount in each crash, so the force on the puck was the same each time.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

If two objects of different masses have the same force strength exerted on them, which object will have the greater change in velocity?

• the more massive object

• the first object

• the object that is moving faster

• the less massive

Tags

NGSS.MS-PS2-2

Mathematical Equivalence

ON

How an object changes velocity depends on the​ ​ ​ (a)   of the force exerted on that object.

• direction
• start
• cause
• none of these

Tags

NGSS.MS-PS2-2