Force and Motion S8P3 and S8P5

What is the runner's average speed?

• 1/4 m/s

• 4 m/s

• 10 m/s

• 40 m/s

Tags

NGSS.MS-PS3-1

If the runner continues to run at the same speed, how far will the runner travel in 30 seconds?

• 7.5 meters

• 40 meters

• 80 meters

• 120 meters

What data table represents an object that is decelerating?

• 
• 
• 
• 

Tags

NGSS.MS-PS3-1

A rocket is traveling through the atmosphere at a constant velocity. Which of the following is TRUE?

• The rocket's engine is producing an unbalanced force that keeps the rocket in the air.

• All the forces acting on the rocket are balanced

• The rocket exerts a greater force on its exhaust gases than the gases exert on the rocket

• The rocket is moving, so some net force must be acting on it.

How much force is needed to accelerate a mass of 160 kg by 2 m/s^2?

• 40N

• 80N

• 320N

• 640N

Tags

NGSS.MS-PS2-2

Student A and Student B are each standing on a skateboard. Student A pushes gently on Student B to start moving. Student B starts moving away from student A. What will happen to Student A and why?

• Student A will not move, because no forces are acting on her.

• Student A will move toward Student B because the same force affects both of them.

• Student A will immediately stop moving because of friction.

• Student A will move away from Student B because an equal and opposite force pushes on her

Tags

NGSS.MS-PS2-1

How is an object's mass related to the force needed to accelerate the object?

• Mass determines the direction of the force needed.

• Mass determines the kind of force needed

• The greater the mass, the greater the force needed

• The smaller the mass, the greater the force needed.

Tags

NGSS.MS-PS2-2

Two objects move away from each other. What happens to the gravitational attraction between them?

• It decreases

• It increases

• it becomes zero

• it does not change

Which of the following statements about gravitational fields is true?

• Gravitational fields affect objects only when two objects are touching

• Gravitational fields affect objects only if the objects are not in contact.

• Any object that has mass is surrounded by a gravitational field.

• Only very massive objects, such as Earth, are surrounded by a gravitational field.

Tags

NGSS.MS-PS2-5

When a rocket attempts to launch, its engine exerts a force downward. The rocket will not launch until the force of the engine is greater than the weight of the rocket. Why?

• The forces must be equal and balanced for the rocket to move

• The force of the engine must be twice as strong as the force of gravity for the rocket to move

• The rocket must move at a constant velocity to take off

• The force of the engine must be greater than the force of gravity to produce a net force upward.

Tags

NGSS.MS-PS2-2