CBSE Class 9 Science How Forces Affect Motion (Class 9 NCERT New) Quiz 4

1. Force = Mass x Acceleration

A Newton's 1st Law B Newton's 2nd Law C Newton's 3rd Law D Newton's 4th Law

2. Newton’s first law of motion is also called the law of ________?

A Mass B Inertia C Force D Velocity

3. Slamming on the brakes in a moving car makes a passenger move forward against his or her seat belt because

A the passenger has the inertia to keep moving forward B the passenger is being pushed by the seats of the car C the passenger is better able to stop themselves in this manner D the passenger has an equal and opposite force supporting their weight

4. How long will an object remain at rest, according to Newton's First Law of Motion?

A it can't rest B until noon C until an unbalanced force occurs D as long as there are unbalanced forces acting on it

5. You are sitting in a car that isn't moving; the car accelerates. Your body is pushed back. Explain.

A newtons B vector C inertia D gravity

6. Why is it harder to push a van filled with bowling balls than it is to push a van with basketballs?

A The mass of the car is greater than the mass of the basketballs B The mass of the bowling balls is greater than the mass of the basketballs C The van with the basketballs is bigger than the van with the bowling balls D It should be equally as hard to push the two vans

7. A wheelbarrow is experiencing two forces. One is pushing 5N east and another 5N west. What is true about the motion of the wheelbarrow?

A it isn't moving B it is accelerating C it is slowing down D its speed is constant

8. A 260.5N unbalanced force applied to push a chair across the room causing an acceleration of 4.2 m/s2. What is the mass of the chair?

A 62.02 kg B 63.69 kg C 263.3 kg D 1123.5 kg

9. The resultant force on the box is

A 2 Newtons to the left B 10 Newtons to the right C 10 Newtons to the left D 20 Newtons to the right

10. A rocket pushes burning gases DOWN which causes the rocket to launch UP. Which law is this?

A Law 1 B Law 2 C Law 3