Which answer choice best explains why tractor trailers take more time to speed up & slow down than regular cars?

Tractor trailers have more mass and require more force to move.

Tractor trailers have less mass and require less force to move.

Tractor trailers have less mass and require more force to move.

Tractor trailers have more mass and require less force to move.

What will be the effect on the boy in the picture if the driver stops quickly?

He will move forward pressing against the seatbelt.

Because of inertia he will remain in the same position.

He will be pushed back into the car seat.

He will move from one side of the car seat to the other.

Two forces applied to a 17 kg box, as shown. The box is on a smooth surface. Which statement best describes the acceleration of the box?

The box accelerates at 1.0 m/s 2 to the right because the net force is 17 N to the right.

The box accelerates at 1.9 m/s 2 to the right because the greater the force is to the right.

The box accelerates at 3.0 m/s 2 to the combined forces cause the box to accelerate.

The box does not accelerate, because neither force is large enough to move the box.

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

The diagram below 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, what is the acceleration of the cyclist?s2

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

2.33 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

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 on 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 had 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 following into the cup was equal and opposite to the acceleration of the card.

Based on Newton's 2nd Law of Motion, which statement is true about the acceleration of wagon A and wagon B if both are being pulled with the same external force

wagon A will have a greater acceleration than wagon B

wagon B will have a greater acceleration than wagon A

wagon A and B will have the same accelerations

the wagons will both have and acceleration of zero

Which one is not an example of Newton's first law?

A stationary car starting to move without being pushed by a force

A fly being hit by a fly swatter

An asteroid crashing into a planet

A chair that isn't moving is picked up and thrown across the room

Newton's first law applies

to both moving and nonmoving objects

only to objects that are not moving

Football A has a greater mass than football B. Which football will have greater acceleration when both are thrown with the same force in the same direction?

They will have the same acceleration

Mass has no effect on acceleration

Forces & Newton's Laws

Authored by Lynn Mahoney

Physics

9th Grade

NGSS covered

Used 1+ times

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45 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The force of materials sliding against one another. This force works against an objects motion.

contact

gravity

friction

inertia

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

If the net force is equal to zero, the forces acting on the object are

balanced

unbalanced

Tags

NGSS.HS-PS2-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

The unit of force is

m/s

m/s^2

newton

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is defined as a push or pull?

force

motion

vector

speed

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An _______ force must act on an object for it to CHANGE it's motion

balanced

unbalanced

gravitational

electrical

Tags

NGSS.MS-PS2-2

MULTIPLE CHOICE QUESTION

20 sec • 1 pt

What law is best described by inertia?

1st

2nd

3rd

Tags

NGSS.HS-PS2-1

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What law is demonstrated by the picture?

1st

2nd

3rd

Tags

NGSS.MS-PS2-1

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Forces & Newton's Laws

The force of materials sliding against one another. This force works against an objects motion.

If the net force is equal to zero, the forces acting on the object are

The unit of force is

What is defined as a push or pull?

An _______ force must act on an object for it to CHANGE it's motion

What law is best described by inertia?

What law is demonstrated by the picture?

An object's resistance to a change in motion.

Which answer choice best explains why tractor trailers take more time to speed up & slow down than regular cars?

Which law is represented by the formula F = ma?

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