7.L.1.3

A student pushes a box to slide it across the floor. Which statement explains why the box begins to move?

• The weight of the box is greater than the force of friction.

• The weight of the box is less than the force of friction.

• The applied force is greater than the force of friction.

• The applied force is less than the force of friction.

Tags

NGSS.MS-PS2-2

A swimmer swims across a pool, and at the end the pool she turns around and pushes off the wall with her feet. Which option describes a pair of action-reaction forces during the push?

• the force of her feet on the wall and the force of the wall on her feet

• the force of gravity on her body and the force of her feet on the wall

• the force of gravity on her body and the force of the wall on her feet

• the force of her feet on the wall and the force of the water on her front

Tags

NGSS.MS-PS2-1

Ben coasts along a flat road on his bike. If Ben stops pedaling, his bike will eventually stop. If energy is conserved, why does the kinetic energy of the bike NOT stay constant and continue to coast forever?

• Friction causes some energy to be converted to matter.

• Friction causes some energy to be converted to heat.

• The energy is collected by the brake system.

• The energy is cooled by the rolling tires.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Rodger pushes his skateboard across a sidewalk.

If the sidewalk is level, which would MOST likely make the skateboard lose its kinetic energy?

• friction

• heat

• magnetism

• temperature

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

The diagram below shows four different objects that all start at the same place and move along the same path.

Which best describes the motion of these objects?

• Both Objects 2 and 3 are at a higher elevation than Object 1

• Both Objects 1 and 2 are at a lower elevation than Object 4

• Object 4 has traveled farther than the other objects.

• Object 1 has traveled farther than the other objects.

Which notes show that Carla’s bicycle is in motion?

• 1, 2, and 5

• 1, 2, and 3

• 2, 3, and 5

• 2, 3, and 4

Which is MOST likely needed when describing the change in position of an object?

• initial speed

• direction change

• reference point

• constant rate

The car is described as traveling east at 30 km/hr.

From which reference point in the diagram is the motion of the car MOST likely being described?

• 1

• 2

• 3

• 4

A jet plane is moving at a constant velocity on a flat surface. Which forces act against the forward motion of the plane?

• gravity and engine thrust

• engine thrust and friction

• friction and air resistance

• air resistance and gravity

Roland dropped a rubber ball straight down. After falling for 2 seconds, the ball struck the ground with a force of 50 newtons (N). Which vector illustrates the reaction force of the ground exerted on the ball?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-1