Unit 3 Force and Motion

When an object is acted on by unbalanced forces, the object will always —

• accelerate

• continue in the same direction

• continue at the same speed

• come to a stop

Tags

NGSS.MS-PS2-2

A student pushes a box with a force of 16 N to the left. Another student pushes the same box from the opposite side with a force of 8 N to the right.

According to the above information and diagram, what will be the result?

• The box will move to the right with an 8 N force.

• The box will move to the right with a 2 N force.

• The box move to the left with a 2 N force.

• The box move to the left with an 8 N force.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The graph below represents the movement of an object.

Which description best fits the motion shown on the above graph?

• An airplane taking off and reaching a constant cruising speed

• A roller coaster traveling up and down the first hill

• A car traveling at a constant speed and stopping to refuel

• A roller coaster traveling down a hill and climbing the next hill

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A 2000 kg truck and a 500 kg car are racing. The same amount of force is applied to each of them.

Which statement below best describes the acceleration of the vehicles?

• The truck will accelerate twice as fast.

• The car will accelerate four times as fast.

• The car will accelerate twice as fast.

• The truck will accelerate four times as fast.

Tags

NGSS.MS-PS2-2

One of the laws of motion states, "An object in motion stays in motion unless an unbalanced force acts upon it." On Earth, objects always seem to eventually come to a stop when more force is not being applied.

What force is causing the objects to eventually stop moving?

• mass

• friction

• weight

• gravity

Two vehicles were involved in an accident. Vehicle A has a mass of 1,447 kg, and Vehicle B has a mass of 1,310 kg. Both vehicles were traveling at 20 km/hr at the time of collision.

What will most likely be the outcome of this collision?

• Vehicle A will have no change in speed and be pushed to the left because it has a smaller mass.

• Vehicle A will have a change in speed and be pushed to the left because it has a larger mass.

• Vehicle B will have no change in speed and be pushed to the left because Vehicle A has a larger mass.

• Vehicle B will have a change in speed and be pushed to the right because Vehicle A has a larger mass.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A conveyor belt is helpful when loading boxes onto a truck.

Which statement accurately represents the net force of the boxes moving along a conveyor belt at a constant speed of 0.5 m/s?

• Forces on the boxes are unbalanced.

• The net force on the boxes is only due to gravity.

• Forces on the boxes are balanced.

• The net force on the boxes cannot be determined.

Tags

NGSS.MS-PS2-2

If a car is moving on a road at 70 km/hr going due north and then changes direction and starts traveling north-east staying at 70 km/hr, what happens to its speed and velocity?

• The speed of the car changes, but the velocity stays the same.

• Both the speed and velocity of the car change.

• Neither the speed nor the velocity of the car changes.

• The velocity of the car changes, but the speed stays the same.

Which of the following statements best describes how the speed and velocity of an object differ?

• Velocity specifies speed and direction, while speed has no specific direction.

• Velocity specifies speed, while speed includes a specific direction.

• Velocity specifies a change in speed over time, while speed specifies a change in distance over time.

• Velocity specifies a change in distance over time, while speed specifies a change in velocity over time.

A student was traveling to see his grandmother who lives 15 miles north of his home. He started from rest and maintained a pace of 4m/s before stopping at his grandmother’s house for lunch.

Which of the following best describes the speed, velocity, and acceleration of the student’s walk?

• He traveled at a speed of 4m/s north with a velocity of 4m/s north, and his acceleration increased before stopping for lunch.

• He traveled at a speed of 4m/s with a velocity of 4m/s, and his acceleration increased before stopping for lunch.

• He traveled at a speed of 4m/s with a velocity of 4m/s north, and his acceleration changed when stopping for lunch.

• He traveled at a speed of 4m/s with a velocity of 4m/s north, and his acceleration did not change when stopping for lunch.

Tags

NGSS.HS-PS2-1