Force and Acceleration Questions

The push or pull on an object with mass causes it to change its velocity. The SI unit of force is Newton. Other units of force are poundal, kilo pond, pound-force, dyne, and kip.

Acceleration is the rate of change of velocity with respect to time. It is given by the formula:

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Important Force and Acceleration Questions with Answers

1. What is the SI unit of force?

1. Joule
2. Watts
3. Newton
4. Radians

Answer: c) Newton

Explanation: The SI unit of force is Newton.

2. According to Newton’s second law: _______

1. F = m + a
2. F = ma
3. F = m – a
4. F = m/a

Answer: b) F = ma

Explanation: The relation between force and acceleration is given by Newton’s second law: F = ma.

3. State true or false: Force is an interaction that changes the state of a body.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: Force is responsible for the change in the state of the body from rest to motion or vice versa.

4. This rate of change of velocity is ______

1. Force
2. Speed
3. Distance
4. Acceleration

Answer: d) Acceleration

Explanation: Acceleration is the rate of change of velocity with respect to time.

5. The gravitational force of the earth is ______

1. 6.8 m/s²
2. 7.8 m/s²
3. 8.8 m/s²
4. 9.8 m/s²

Answer: d) 9.8 m/s²

Explanation: The value of the gravitational force of the earth is 9.8 m/s^2.

6. Define angular acceleration.

The time rate of change of angular velocity is called as angular Acceleration.

7. What is the formula to find the angular acceleration?

1. \(\begin{array}{l}\omega =\frac{\theta }{t}\end{array} \)
2. \(\begin{array}{l}\omega =\frac{t}{\theta }\end{array} \)
3. \(\begin{array}{l}\omega ={t}{\theta }\end{array} \)
4. \(\begin{array}{l}\omega ={t}+{\theta }\end{array} \)

Answer:a)

Explanation: Angular acceleration is given by the formula:

Where,

8. Choose YES or NO: Is poundal the unit of acceleration?

1. YES
2. NO

Answer: b) NO

Explanation: Poundal is the unit of force.

9. What is the dimensional formula of the force?

The dimensional formula of the force is LMT^-2_.

10. When the object is moving in a circle, and its acceleration vector is pointed towards the centre of that circle. Which type of acceleration is seen in this case?

1. Centripetal acceleration
2. Gravitational acceleration
3. Tangential acceleration
4. Coriolis acceleration

Answer: a) Centripetal acceleration

Explanation: The property of the motion of an object traversing a circular path experiences centripetal acceleration.

Practice Questions

1. Can the body experience zero acceleration?
2. Define radial acceleration.
3. What is meant by spring balance?
4. Name the other units of force.
5. Define 1 Newton.