Force and Motion Pretest

A girl pushes on the classroom door to open it. Which two terms accurately describe the net force acting on the door?

• contact and balanced

• contact and unbalanced

• noncontact and balanced

• noncontact and unbalanced

Tags

NGSS.MS-PS2-2

Two dogs pull on a rope. One dog pulls with a force of 5 N to the left, and the other dog pulls with a force of 3 N to the right. What is the result?

• The rope remains in place

• The rope moves to the left

• The rope moves to the right

• The rope has a balanced force applied to it

Tags

NGSS.MS-PS2-2

A bus driver drove from Philadelphia to Washington D.C. He drove the first 100 km in 2 hours, the next 55 km in 1 hour, and the final 75 km in 2 hours. What is the average speed of the bus throughout the trip?

• 46 km/h

• 50 km/h

• 77 km/h

• 81 km/h

Tags

NGSS.MS-PS3-1

Which statement about acceleration is always true?

• The unit m/s is the SI unit of acceleration.

• For objects to accelerate, they must speed up.

• Either a change in speed or a change in direction causes acceleration.

• Both speed and direction must change for acceleration to occur.

A cross country runner runs 4 km in 15 minutes. What can you calculate using this information?

• acceleration

• force

• speed

• velocity

Tags

NGSS.MS-PS3-1

A soccer player kicks a ball. Which of the following describes the reaction force to this kick?

• friction between the ball and the foot

• friction between the ball and the ground

• force applied to the ground by the foot

• force applied to the foot by the ball

Which term describes resistance to a change in motion?

• Acceleration

• Inertia

• Net force

• Velocity

The acceleration of a baseball after it is hit by a bat depends on the mass of the ball and the net force on the ball. This example best illustrates what law?

• Newton's first law

• Newton's second law

• Newton's third law

• Newton's law of universal gravitation

Tags

NGSS.MS-PS2-2

When is there static friction between your desk chair and the floor?

• when the chair sits still

• when the chair falls to the floor

• when you lift the chair

• when you slide your chair under your desk

What is the relationship between the kinetic energy of an object and the mass of an object? Assume the speed is constant.

• Kinetic energy gets bigger at the same rate as the mass of an object.

• Kinetic energy gets bigger at a faster rate than the increase of the mass of an object.

• Kinetic energy decreases as the mass of an object increases.

• Kinetic energy decreases at a faster rate than the increase of the mass of an object.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4