SPS8D

A car accelerates at a rate of 3.0 m/s² after stopping at a red light. If the mass of the car is 3000 kg, what force does its engine exert?

• 1000 N

• 3000 N

• 0.05 N

• 9000 N

Tags

NGSS.MS-PS2-2

If the net force acting on a stationary object is zero, then the object will (1 pt.)

• Decelerate at a steady rate of speed

• Accelerate in the direction of the strongest force

• Begin moving backwards

• Remain at rest.

Tags

NGSS.3-PS2-1

The difference between speed and velocity is that velocity includes (1 pt.)

• Weight

• Direction

• Distance

• Time

Which of the following statements are true of inertia? List the two that apply. (2 pts.)

• Inertia is a force.

• Inertia is a force which keeps stationary objects at rest and moving objects in motion at constant velocity.

• All objects have inertia.

• A more massive object has more inertia than a less massive object.

What happens to the magnetic field around a wire when the electric current through the wire increases?

• It decreases

• It remains the same

• It increases

• It reverses direction

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which of the following is the BEST scientific definition of work? (1 pt.)

• Effort multiplied by distance

• The conversion of energy from one form to another

• A force being exerted over time

• A force moving an object over a distance

Tags

NGSS.MS-PS3-5

Many public buildings now have entrance ramps in addition to entrance stairs. Which principle explains the idea behind entrance ramps? (1 pt.)

• By increasing the distance, the force required decreases

• By increasing the distance, the required force increases

• By increasing the force, the required distance decreases

• By increasing the force, the required distance increases

The sides of a sailboat slant sharply to help the boat move through the water. The boat itself acts as what type of simple machine? (1 pt.)

• wedge

• A pulley

• A screw

• An inclined plane

Which of the following does not indicate velocity?

• 20 miles from Sandy Springs to Decatur

• 36 mi/h towards downtown Atlanta along Peachtree Street

• 22 ft/s SSE

• 82 km/h going from Georgia to Louisiana

Lucas pushes on a car stuck in a ditch with a force of 1000 N for 15 minutes. The car remains stuck. How much work did Lucas do? (1 pt.)

• 66.7 J

• 0 J

• 1.22 J

• 22,000 J