Q1. What is the mass of a 20 kg object?

Background

Topic: Mass and Weight

This question is testing your understanding of the difference between mass and weight, and how to identify mass given an object's description.

Key Terms:

• Mass (): The amount of matter in an object, measured in kilograms (kg).

• Weight (): The force due to gravity acting on an object, .

• : Acceleration due to gravity, typically on Earth.

Step-by-Step Guidance

1. Read the question carefully to determine if it is asking for mass or weight.

2. Recall that mass is a scalar quantity and does not depend on location (unlike weight).

3. Identify the value given for mass in the question.

Try solving on your own before revealing the answer!

Q2. What is the weight of a 20 kg object?

Background

Topic: Weight Calculation

This question is testing your ability to calculate the weight of an object using its mass and the acceleration due to gravity.

Key formula:

• = weight (in Newtons, N)

• = mass (in kg)

• = acceleration due to gravity ()

Step-by-Step Guidance

1. Identify the mass of the object: .

2. Recall the value of on Earth: .

3. Set up the formula for weight: .

4. Multiply the mass by the acceleration due to gravity to find the weight.

Try solving on your own before revealing the answer!

Q3. What is the weight of a 40 kg object?

Background

Topic: Weight Calculation

This question is similar to the previous one, testing your ability to use the weight formula for a different mass.

Key formula:

• = mass (in kg)

• = acceleration due to gravity ()

Step-by-Step Guidance

1. Identify the mass: .

2. Recall .

3. Set up the formula: .

4. Multiply the mass by to find the weight.

Try solving on your own before revealing the answer!

Q4. What is the weight of a 2 kg object?

Background

Topic: Weight Calculation

This question tests your ability to apply the weight formula to a smaller mass.

Key formula:

• = mass (in kg)

• = acceleration due to gravity ()

Step-by-Step Guidance

1. Identify the mass: .

2. Recall .

3. Set up the formula: .

4. Multiply the mass by to find the weight.

Try solving on your own before revealing the answer!

Q5. What is the Normal Force acting on the 200 N girl?

Background

Topic: Normal Force

This question is testing your understanding of the normal force, which is the support force exerted by a surface perpendicular to the object.

Key Terms:

• Normal Force (): The force exerted by a surface to support the weight of an object resting on it.

• For an object at rest on a flat surface, (if no other vertical forces are present).

Step-by-Step Guidance

1. Identify the weight of the girl: .

2. Recall that the normal force balances the weight for an object at rest on a horizontal surface.

3. Set up the equation: .

Try solving on your own before revealing the answer!

Q6. What is the Normal Force acting on the 40 kg boy?

Background

Topic: Normal Force

This question tests your ability to calculate the normal force for an object with a given mass.

Key formula:

• = mass (in kg)

• = acceleration due to gravity ()

Step-by-Step Guidance

1. Identify the mass: .

2. Recall .

3. Set up the formula: .

4. Multiply the mass by to find the normal force.

Try solving on your own before revealing the answer!

Q7. If a 300 N girl holds a 50 N box, what is the Normal Force acting on the girl?

Background

Topic: Normal Force with Additional Load

This question tests your understanding of how the normal force changes when an object is holding another object.

Key formula:

• = weight of the girl (in N)

• = weight of the box (in N)

Step-by-Step Guidance

1. Identify the weight of the girl: .

2. Identify the weight of the box: .

3. Recall that the normal force must support both the girl and the box.

4. Set up the equation: .

Try solving on your own before revealing the answer!