2.2.8 Reading Quiz - Newton's second law, momentum impulse

1. change of momentum is also known as

Acceleration

Force

Impulse

Work done

Unbalanced force

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.

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.

2. What is the significance of the area of a force/time graph

Distance moved

Total force

Change of momentum

Change of velocity

Acceleration

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.

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.

3. What is momentum?

The tendency of a body to keep moving

The product of mass and velocity i.e. mxv

The resistance something has to being stopped.

The ability of something to spin around

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.

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.

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

10 ms-2 to left

10 ms-2 to right

4 ms-2 to left

4 ms-2 to right

6 ms-2 to left

6 ms-2 to right

Explanation

5. What is impulse as (far as physics is concerned)

Product of time and force

Product of force and distance

Product of time and energy

Product of momentum and time

When you feel you have the urge to react to something

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.

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.

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

100,000 Kgms-1

20,000 Kgms-1

5000 Kgms-1

50 Kgms-1

momentum = mv = 1000 x 100/5
=20 000 kgm/s

Explanation

momentum = mv = 1000 x 100/5
=20 000 kgm/s

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

Acceleration is proportional to Force

Acceleration is proportional to mass

Acceleration is inversely proportional to mass

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.

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.

8. 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?

2ms-2 up slope

2ms-2 down slope

Zero - block must stay still

Zero - block slides down with constant velocity

Explanation

9. Why does a car have crumple zones?

To reduce the speed as soon as possible

To slow down the passenger as soon as possible

To increase the time taken for a collision

To reduce the time taken for a collision

It looks good in films

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

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.

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.

10. A 0.05Kg egg in a specially designed eggbox designed by 2 students last year in year 10 hits the floor at 2ms-1, it comes to rest in 0.1 second due to it being well padded. What is the average force acing on the egg when it lands on the floor

10N

1N

20N

2N

0.1N

0.2N

Explanation

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