Force and Motion

To make an object move you must first apply ---

• an opposing force

• an unbalanced force

• a stationary force

• a vertical force

Tags

NGSS.MS-PS2-2

a force is best defined as ---

• the application of weight

• a push or pull that is exerted on matter

• the flow of electric charges

• a bond in which electrons are shared

A student pushes against a wall with 20 N of force and the wall does not move. In this situation, the wall exerts --

• 0 N of force

• less than 20 N of force

• 20 N of force

• more than 20 N of force

Tags

NGSS.MS-PS2-1

Which change would require more force to pull the wooden block up the ramp?

• Have the student use two hands

• Reduce the mass of the wooden block.

• Restack the books so the thinnest book is on the bottom.

• Glue sandpaper to the surface of the ramp.

Tags

NGSS.MS-PS2-2

The force of an object, with a certain mass accelerating at a certain rate, can be determined by using the equation below.

force = mass x acceleration

Which object would have the greatest force?

• A 5 kg object accelerating at 10 m/s

• A 5 kg object accelerating at 20 m/s

• a 20 kg object accelerating at 4 m/s

• a 20 kg object accelerating at 3 m/s

Tags

NGSS.MS-PS2-2

Which of these would be different for an object if measured on the Earth and on the Moon?

• Mass

• Weight

• Volume

• Density

The diagram below show the forces acting on a soccer ball.

In which of the diagrams will the ball remain motionless?

• W

• X

• Y

• Z

Tags

NGSS.MS-PS2-2

Ana pushed on a big rock in her back yard. She was unable to get it to move because she did not -

• apply enough force

• have a good grip on the rock

• have enough mass

• weigh enough

Tags

NGSS.MS-PS2-2

Many bicycles use a hand brake to control their speed. When the brake is engaged, a rubber pad presses against the tire. What force of motion does the hand brake rely upon to slow the bicycle?

• Gravity

• Friction

• Electricity

• Magnetism

In a head-on collision, a person who is not wearing a seat belt continues to move forward at the original speed of the car because of -

• weight

• mass

• gravity

• inertia