# 2.2.8 Reading Quiz - Newton's Second Law, Momentum Impulse

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2.2. 8 Reading Quiz - Newton's second law, momentum impulse

• 1.

### What statement of Newton's 2nd Law is NOT true

• A.

Acceleration is proportional to Force

• B.

Acceleration is proportional to mass

• C.

Acceleration is inversely proportional to mass

B. Acceleration is proportional to mass
Explanation
According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that when the force acting on an object increases, its acceleration also increases, and when the mass of the object increases, its acceleration decreases. Therefore, the statement "acceleration is proportional to mass" is not true, as it contradicts Newton's second law.

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• 2.

### A 2Kg mass pushed to the left with 20N, and to the right with 12N.  What is the acceleration

• A.

10 ms-2 to left

• B.

10 ms-2 to right

• C.

4 ms-2 to left

• D.

4 ms-2 to right

• E.

6 ms-2 to left

• F.

6 ms-2 to right

C. 4 ms-2 to left
• 3.

### A 5Kg block slides down a slope.  Component of gravity acting down the slope is 10N, Friction acting up the slope is 10N, what is the acceleration?

• A.

2ms-2 up slope

• B.

2ms-2 down slope

• C.

Zero - block must stay still

• D.

Zero - block slides down with constant velocity

D. Zero - block slides down with constant velocity
• 4.

### What is momentum?

• A.

The tendency of a body to keep moving

• B.

The product of mass and velocity i.e. mxv

• C.

The resistance something has to being stopped.

• D.

The ability of something to spin around

B. The product of mass and velocity i.e. mxv
Explanation
Momentum is defined as the product of an object's mass and velocity. It is a measure of how difficult it is to stop an object or change its direction. The greater the mass or velocity of an object, the greater its momentum. This concept is important in physics and helps explain the behavior of moving objects.

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• 5.

### What is impulse as (far as physics is concerned)

• A.

Product of time and force

• B.

Product of force and distance

• C.

Product of time and energy

• D.

Product of momentum and time

• E.

When you feel you have the urge to react to something

A. Product of time and force
Explanation
Impulse in physics is defined as the product of time and force. This means that when a force is applied to an object for a certain amount of time, the impulse experienced by the object is equal to the force multiplied by the time period over which the force is applied. Impulse is a vector quantity and is directly related to the change in momentum of an object. It can be calculated using the equation Impulse = Force × Time.

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• 6.

### change of momentum is also known as

• A.

Acceleration

• B.

Force

• C.

Impulse

• D.

Work done

• E.

Unbalanced force

C. Impulse
Explanation
Impulse is the correct answer because it refers to the change in momentum of an object. When a force is applied to an object for a certain amount of time, it causes a change in the object's momentum. This change in momentum is known as impulse. Impulse is equal to the force applied multiplied by the time it acts on the object. Therefore, impulse is the correct term to describe the change of momentum.

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• 7.

### What is the momentum of a 1000Kg car travelling 100m in 5 seconds?

• A.

100,000 Kgms-1

• B.

20,000 Kgms-1

• C.

5000 Kgms-1

• D.

50 Kgms-1

B. 20,000 Kgms-1
Explanation
momentum = mv = 1000 x 100/5
=20 000 kgm/s

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• 8.

• A.

10N

• B.

1N

• C.

20N

• D.

2N

• E.

0.1N

• F.

0.2N

B. 1N
• 9.

### What is the significance of the area of a force/time graph

• A.

Distance moved

• B.

Total force

• C.

Change of momentum

• D.

Change of velocity

• E.

Acceleration

C. Change of momentum
Explanation
The area of a force/time graph represents the impulse applied to an object, which is equal to the change in momentum. Impulse is the product of force and time, and it causes a change in momentum. Therefore, the significance of the area of a force/time graph is that it quantifies the change of momentum experienced by an object.

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• 10.

### Why does a car have crumple zones?

• A.

To reduce the speed as soon as possible

• B.

To slow down the passenger as soon as possible

• C.

To increase the time taken for a collision

• D.

To reduce the time taken for a collision

• E.

It looks good in films

• F.

Car manufacturers do this so you have to buy a new car if you wrap it around a lamp post.

C. To increase the time taken for a collision
Explanation
Crumple zones in a car are designed to increase the time taken for a collision. By providing areas of the car that can deform and absorb energy during a crash, the impact forces are spread out over a longer period of time. This helps to reduce the severity of the collision and minimize the potential injuries to the passengers.

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• 11.

### Are there any parts of Newton's 2nd Law, momentum and impulse that you would like to go over.  Can you formulate a question?

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• Current Version
• Apr 10, 2024
Quiz Edited by
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• Oct 18, 2012
Quiz Created by
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