The diagram shows a homemade car being pushed with a force of 25 N. The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?

The speed of the car will increase.

The car will move at a constant speed of 13 m/s.

The speed of the car will not change.

The speed of the car will decrease to 1 m/s.

For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records the data in the table below. Which of these best explains the student's data?

The speed of the cart increases as the cart rolls down the ramp because the forces acting on the cart are unbalanced.

The speed of the cart decreases as the cart rolls down the ramp because of friction between the cart and the ramp.

The speed of the cart increases as the cart rolls down the ramp because the force acting on the cart is greater than the force of gravity.

The speed of the cart decreases as the cart rolls down the ramp because the forces acting on the cart are balanced.

The diagram shows a boat moving north in a river at 3 m/s while the current in the river moves south a 1 m/s. How will the boat be affected if it enters a part of the river where the current is moving south at 2 m/s?

The boat will move to the west.

A toy train engine rests motionless on a track. Once student begins pushing the engine to the right with a force of 2 newtons. At the same time, another student begins pushing the engine to the left with a force of 5 newtons. Which of the following best describes the resulting motion of the engine?

It travels left at an increasing speed.

It travels left at a constant speed.

It travels right at a constant speed.

It travels right at an increasing speed.

A student graphed the position of a cart during a 7-second time interval. Which statement best describes the cart?

The cart moved at a constant velocity of 0.5 m/s for the entire 7 seconds.

The cart was stationary with a velocity of 0 m/s for the entire 7 seconds.

The cart was stationary except for a short burst of acceleration of 0.5 m/s 2 .

The cart accelerated at a constant rate of approximately 0.8 m/s 2 .

What is the difference between the velocity and the speed of an object?

Velocity has a direction associated with it, while speeds has no specific direction.

Velocity is the change in distance over time, while speed is the change in velocity over time.

Velocity has no direction associated with it, while speed has a specific direction.

Velocity is the change in speed over time, while speed is the change in distance over time.

The three vehicles shown are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck _____________________.

is traveling on a curve on the road

can accelerate faster than the other two vehicles

is traveling in the opposite direction from the other two vehicles

needs a large amount of force to move

The list includes six situations. Which objects in the list experience an unbalanced force?

The can, the swing, and the bird

The book, the ball, and the car

The ball, the car, and the bird

The book, the ball, the can, and the swing

NASA's space shuttle program was active from 1981 until 2011. The photograph shows rockets carrying a space shuttle off the launchpad. How can Newton's law of action-reaction best be applied to explain the movement of a rocket?

As fuel burns, gasses push against the rocket, moving it upward.

As fuel burns, gasses move out of the rocket and reduce air resistance.

As the fuel burns, the mass of the rocket decreases.

As the fuel burns, the rocket moves faster.

During a demonstration of Newton's laws of motion, a student used the setup shown in Figure 1. The student flicked the index card with a fingertip, and the coin fell straight down into a plastic cup as shown in Figure 2. Which of these best explains why the coin fell straight down into the cup instead of remaining in the index card?

The coin was at rest until the card was removed, so it tended to remain in the same location. Once the card was gone, the unbalanced force of gravity caused the coin to fall.

Moving the card applied an action force on the coin. Since the card was gone, gravity applied a reaction force on the coin.

The card has less mass than the coin, so a smaller force of gravity acted on the card. The larger force of gravity on the coin made it fall.

The acceleration of the coin falling into the cup was equal and opposite to the acceleration of the card.

The diagram shows two different forces acting on a cyclist riding a bicycle. The total mass of the cyclist and the bicycle is 100.0 kg. Based on this information, was is the acceleration of the cyclist?

0.66 m/s 2 forward, because the applied force is greater than the force of the air

0.66 m/s 2 backward, because the force of the air slows the cyclist down

2.3 m/s 2 backward, because the forces are opposite and not equal

2.3 m/s 2 forward, because the cyclist's inertia is greater than the force of the air

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

The car with the smaller mass will require less force to stop than the car with the larger mass.

The car with the larger mass will maintain its velocity while traveling down the hill.

The car with the smaller mass will take longer to stop than the car with the larger mass.

The car with the larger mass will have less inertia than the care with the smaller mass.

A mother and daughter press their hands together and then push apart while ice skating. Immediately after they push away from each other, how does the motion of the mother and daughter change?

Both move backward, but the daughter moves with a greater acceleration.

The mother moves forward, and the daughter moves backward with a greater acceleration

Both move forward, but the mother moves with a greater acceleration.

The mother moves backward, and the daughter moves forward with a greater acceleration

A demonstration helps students understand a principle of roller coaster design. Which answer choice correctly describes the ball’s kinetic and potential energy?

The ball has more kinetic energy at position Y than at position W.

The ball has more potential energy at position X than at position Z.

The potential energy and kinetic energy of the ball are equal at position X.

The potential energy and kinetic energy of the ball are greatest at position Z.

A large rock is motionless on a flat sidewalk. Which statement best explains why the rock remains motionless?

The forces acting on the rock are all balanced.

There are no forces acting on the rock.

The only force acting on the rock is directed toward the sidewalk.

The sidewalk exerts an unbalanced force on the rock.

A pitcher throws a ball toward a player holding a softball bat. The player uses the bat to hit the ball. The bat applies a 10-newton force to the ball. Which statement correctly describes the reaction force between the bat and ball?

The reaction force is the force of the ball on the bat.

The reaction force is the force that causes the ball to move toward the bat.

The reaction force is the force applied to the bat by the player holding the bat.

The reaction force is the force that pulls the ball toward the ground.

Unit 6 - Force and Motion - Challenge Version

Authored by Jill Gregory

Science

8th Grade

NGSS covered

Used 28+ times

Unit 6 - Force and Motion - Challenge Version

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31 questions

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MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2. If the force of friction resisting the student's push is 4 N, what is the new force acting on the board?

4 N

6 N

10 N

14 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Deep Space 1 was a spacecraft powered by an engine that gave off xenon particles to change velocity. It had a mass of 500 kg. Which expression can be used to find the spacecraft's acceleration if its engine created a net force of 0.10 N?

$\frac{\text{0.10 N}}{500\ kg}$

$500\ kg\ \cdot\ 0.10\ N$

$\frac{500\ kg}{0.10\ N}$

$500\ kg\ +\ 0.10\ N$

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at 2,000 m/s². What is the net force, to the nearest newton, that accelerates the ball?

2.5 N

10 N

40N

100 N

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

Four students push carts filled with sports equipment across the gym. Each student pushes with the same force. Which cart has the greatest change in speed?

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A student used a video camera to record another student dropping a marble through water in a graduated cylinder. The students watched the video in slow motion and made the observations shown below. During which part or parts of the marble's fall did the marble experience unbalanced forces?

Part 1 only

Parts 1 and 2 only

Part 3 only

Parts 2 and 3 only

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

A student uses a magnet to move a 0.025 kg metal ball. The magnet exerts a force of 5 N, which causes the ball to begin moving. What is the acceleration of the ball when it begins to move?

200 m/s²

0.125 m/s²

5 m/s²

5.025 m/s²

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

The diagram below shows a sled moving along a smooth, frictionless track. In which sections of the track will the sled experience an unbalanced force?

Sections 1 and 3

Sections 2 and 3

Sections 2 and 4

Sections 3 and 4

Tags

NGSS.MS-PS2-2

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Unit 6 - Force and Motion - Challenge Version

Two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to Student 2. If the force of friction resisting the student's push is 4 N, what is the new force acting on the board?

Deep Space 1 was a spacecraft powered by an engine that gave off xenon particles to change velocity. It had a mass of 500 kg. Which expression can be used to find the spacecraft's acceleration if its engine created a net force of 0.10 N?

A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at 2,000 m/s2. What is the net force, to the nearest newton, that accelerates the ball?

Four students push carts filled with sports equipment across the gym. Each student pushes with the same force. Which cart has the greatest change in speed?

A student used a video camera to record another student dropping a marble through water in a graduated cylinder. The students watched the video in slow motion and made the observations shown below. During which part or parts of the marble's fall did the marble experience unbalanced forces?

A student uses a magnet to move a 0.025 kg metal ball. The magnet exerts a force of 5 N, which causes the ball to begin moving. What is the acceleration of the ball when it begins to move?

The diagram below shows a sled moving along a smooth, frictionless track. In which sections of the track will the sled experience an unbalanced force?

The diagram shows a homemade car being pushed with a force of 25 N. The force causes the car to move at a constant speed of 3 m/s. What will happen if the force is changed to 35 N?

For an investigation, a student measures the speed of a cart as it rolls down a ramp. The student then records the data in the table below. Which of these best explains the student's data?

Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s2?

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Discover more resources for Science

A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at 2,000 m/s². What is the net force, to the nearest newton, that accelerates the ball?

Some students measure the acceleration of a wheeled cart being acted on by varying forces. The students record their data in the table shown above. According to the data table, how much force is acting on the cart when the students measure an acceleration of 2.6 m/s²?