6.7 A Review

Before the cord is cut, how is the motion described for both carts? Select 3 correct answers.

• The carts have the same acceleration before the application of the spring force.

• The carts have a balanced force before the application of the spring force.

• The carts have a change in direction before the application of the spring force.

• The carts have the same position before the application of the spring force.

• The carts have no motion before the application of the spring force.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A feather fell from a nest on a tree branch in a straight path with constant speed until reaching the ground. The path it followed is shown in the illustration below. Which of these statements best describes why the feather fell with constant speed and moved in a straight path? Select 2 correct answers.

• The upward force of the air on the feather was greater than the downward force.

• Objects with irregular shapes never fall in straight lines.

• The feather had balanced forces with the air currents and gravity.

• Air currents and gravity applied unbalanced forces to the feather.

• The feather experienced no change in speed and same direction.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Which types of forces must occur for the toy truck to stay resting on the floor?

• Balanced forces.

• Unbalanced forces.

• Gravitational forces only.

• Frictionless forces.

Tags

NGSS.3-PS2-1

Which types of forces must occur for the toy car to keep moving down the ramp?

• Unbalanced forces.

• Balanced forces.

• Gravitational forces only.

• No forces are needed.

Tags

NGSS.3-PS2-1

Which paper airplanes experienced unbalanced net forces when flying? Select 3 correct answers.

• 1

• 2

• 3

• 4

• 5

Tags

NGSS.MS-PS2-2

Which types of forces occur when the appliance worker tries to move the refrigerator across the floor?

• Balanced forces

• Gravitational forces

• Magnetic forces

• Nuclear forces

Tags

NGSS.MS-PS2-2

An appliance worker pushes a 75.7 kilogram refrigerator across a floor with a force of 27N. The force of friction from the floor is in the opposite direction pushing with -27N. What is the approximate acceleration of the refrigerator?

• 0 m/s²

• 0.5 m/s²

• 1 m/s²

• 2 m/s²

Tags

NGSS.MS-PS2-2

What is the net force acting on the athlete as they swim in the river?

• 10 Newtons of force

• 17 Newtons of force

• 7 Newtons of force

• 3 Newtons of force

Tags

NGSS.MS-PS2-2

The diagram shows an athlete swimming in a river in the opposite direction the river is flowing. The swimmer pushes against the river water, so the water pushes the athlete forward with 10 Newtons of force. The river also exerts 7 newtons of resistive force against the athlete. Which statement best describes the forces acting on the swimmer?

• A. Balanced forces

• B. Unbalanced forces

• C. Both balanced and unbalanced forces

• D. No forces

Tags

NGSS.MS-PS2-2

Two students press their hands together and then push apart while on their skateboards. What is the net force on the two skaters AND what type of forces are acting on the skaters to have motion?

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2