Quiz about 7H UNIT 3

Question 1

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?

Accepted Answer

Friction

Answer

Mass

Answer

Weight

Answer

Gravity

Question 2

What is the net force and direction for the first diagram?

Accepted Answer

0N, no direction (forces are balanced)

Answer

5N, to the right

Answer

10N, to the left

Answer

15N, to the right

Question 3

What is the net force and direction for the second diagram?

Accepted Answer

17N left (35N - 18N = 17N left; up and down forces are balanced)

Answer

17N right (35N - 18N = 17N right; up and down forces are balanced)

Answer

53N left (35N + 18N = 53N left; up and down forces are balanced)

Answer

0N (All forces are balanced)

Question 4

What is the net force and direction for the third diagram?

Accepted Answer

15N down (45N - 30N = 15N down)

Answer

75N up (45N + 30N = 75N up)

Answer

15N up (45N - 30N = 15N up)

Answer

30N down (45N - 15N = 30N down)

Question 5

What is the net force and direction of the force for ? Choose the correct answer from each drop-down to complete the statement.

Accepted Answer

Downward

Answer

Upward

Answer

Leftward

Answer

Rightward

Question 6

Describe the forces below as an action or reaction force.

Accepted Answer

Action Force

Answer

Reaction Force

Question 7

Describe the forces below as an action or reaction force.

Accepted Answer

Action Force

Answer

Reaction Force

Question 8

A runner's foot pushes backward on the ground.

Accepted Answer

Action Force

Answer

Reaction Force

Question 9

Describe the forces below as an action or reaction force.

Accepted Answer

Action Force

Answer

Reaction Force

Question 10

Which rocket had the greatest acceleration?

Accepted Answer

Rocket 1

Answer

Rocket 2

Answer

Rocket 3

Question 11

Using F=ma, explain why a train is more difficult to start moving and more difficult to bring to a stop than an average sized car.

Accepted Answer

Because a train has much more mass than a car, requiring more force to change its motion.

Answer

Because a train has less friction than a car, making it harder to move or stop.

Answer

Because a train moves faster than a car, so it is harder to control.

Answer

Because a train uses a different type of engine than a car, making it harder to start or stop.

Question 12

A rocket booster initially applies 10,000 N of force to a 1,000.0 kg rocket causing it to accelerate at 10.0 m/s². Ten minutes later, the rocket booster is released and it falls through the atmosphere. The mass of the rocket is now 760.0 kg and its acceleration is 7.0 m/s². How much force is now being applied to the rocket?

Accepted Answer

5320 N

Answer

7000 N

Answer

10600 N

Answer

760 N

Question 13

During a tug-of-war competition, neither team is able to gain an advantage. Which of the following explains the forces in this situation?

Accepted Answer

The forces are balanced.

Answer

The forces are overcome by air friction.

Answer

The mass of the rope cancels the forces being exerted on it.

Answer

The forces are unbalanced.

Question 14

You are riding in a vehicle with a coffee cup on the dashboard while traveling 30 km/h. The vehicle makes a sudden stop to avoid hitting the car that has stopped in front of it. Which illustration best demonstrates what would happen to the coffee cup?

Accepted Answer

Go forward

Answer

Go backward

Question 15

The masses of four bowling balls, and the net forces acting on them as they approach the pins at the end of the lane, are recorded in the table below. Bowling Balls Approaching Pins | Ball Color | Mass (kg) | Force (N) | |------------|-----------|-----------| | Green | 5 | 9 | | Red | 3 | 9 | | Pink | 6 | 9 | | Purple | 9 | 9 | Which bowling ball has the greatest acceleration as it approaches the pins at the end of the lane?

Accepted Answer

The red ball

Answer

The green ball

Answer

The pink ball

Answer

The purple ball

Question 16

Two vehicles with different masses are traveling 104 kilometers per hour on a highway. As each vehicle approached a traffic light, it turned red. Each car applied their brakes at the same time and applied the same amount of force to stop.

Accepted Answer

The vehicle with the larger mass took longer to stop than the vehicle with the smaller mass.

Answer

The vehicle with the smaller mass took longer to stop than the vehicle with the larger mass.

Answer

The vehicle with the smaller mass has more inertia than the vehicle with the larger mass.

Answer

The vehicle with the larger mass took less force to stop than the vehicle with the smaller mass.

Question 17

Observe the illustration above. If the student fell off of the skateboard in the direction indicated, which arrow indicates the most likely direction the skateboard would travel based on the law of action-reaction?

Accepted Answer

1

Answer

2

Answer

3

Question 18

A student bounces a basketball off the gym floor. Which statement correctly describes the action-reaction force pair that causes the ball to bounce?

Accepted Answer

The gym floor pushes up on the ball as the ball pushes down on the floor with an equal amount of force.

Answer

The gym floor pushes up on the ball with a greater amount of force than the ball pushes down on the floor.

Answer

The gym floor pushes up on the ball as gravity pulls down on the ball with an equal amount of force.

Answer

The gym floor pushes up on the ball with a greater amount of force than gravity pulls down on the ball.

Question 19

When a cannon fires a cannonball we observe Newton's third law. Which is the reaction force?

Accepted Answer

The cannon moving backwards

Answer

The cannon moving forward

Answer

The cannonball moving backwards

Answer

The cannonball moving forward

Question 20

Which law is this demonstrating?

Accepted Answer

3rd law because they move in opposite directions with the same force.

Answer

1st law because the cannon moves slower due to having more mass.

Answer

2nd law because the cannon doesn't move until an unbalanced force is applied.

Answer

4th law because cannons go boom.

Question 21

Consider the scenario of a skydiver falling down toward earth. Which of the following is true?

Accepted Answer

The earth is pulling down on the skydiver with a gravitational force, and the skydiver is pulling up on the earth with an equal gravitational force.

Answer

The earth is pulling down on the skydiver with a gravitational force, but the skydiver does not exert a gravitational force on the earth.

Answer

The earth is pulling down on the skydiver with a large gravitational force, and the skydiver is pulling up on the earth with a small gravitational force.

Answer

Neither the earth nor the skydiver can exert a force on each other because they're too far away.

Question 22

A baseball bat hits a baseball with a force of 100 Newtons. What is the force and its direction exerted by the ball on the bat?

Accepted Answer

100 Newtons, opposite direction

Answer

100 Newtons, same direction

Answer

200 Newtons, same direction

Answer

200 Newtons, opposite direction

Question 23

What law is demonstrated by the picture?

Accepted Answer

3rd

Answer

1st

Answer

2nd

Question 24

If the hammer hits the nail with a 55 N force, the nail hits the hammer with a

Accepted Answer

55N force

Answer

force less than 55N

Answer

force greater than 55N

Answer

0N force

Question 25

Newton's Third Law of Motion is best defined by which statement?

Accepted Answer

For every action there is an equal and opposite reaction.

Answer

A body at rest tends to remain at rest.

Answer

A body in motion tends to remain in motion unless acted on by another force.

Answer

Inertia, it is all about inertia and speed and motion.

7H UNIT 3

29 questions

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?

What is the net force and direction for the first diagram?

What is the net force and direction for the second diagram?

What is the net force and direction for the third diagram?

What is the net force and direction of the force for ? Choose the correct answer from each drop-down to complete the statement.

Describe the forces below as an action or reaction force.

Describe the forces below as an action or reaction force.

A runner's foot pushes backward on the ground.

Describe the forces below as an action or reaction force.

Based on the observations and the calculations made by the students, what is the estimated force applied to the skateboarder if the acceleration is 0.9 m/s²?

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