Net Forces

What kind of motion would be associated with the object in this free body diagram?

• Constant velocity

• At rest

• Accelerating

• Decelerating

Answer explanation

The free body diagram likely shows balanced forces, indicating no net force acting on the object. This means it could either be at rest or moving with constant velocity, hence both options are correct.

Tags

TX.SCI.9-10.I.5.B

TX.SCI.8.7.A

If the downward force due to gravity is 200 N, what other force can you solve for if the object is at rest?

• Applied force

• Force of friction

• Normal force

• Force of tension

Answer explanation

When an object is at rest, the forces acting on it must be balanced. The downward force due to gravity (200 N) is balanced by the normal force acting upward. Therefore, the normal force can be solved as 200 N.

Tags

NGSS.HS-PS2-1

What is the acceleration of this object if the mass is 2 kg?

• 20 m/s^2

• 10 m/s^2

• 5 m/s^2

• 2.5 m/s^2

Answer explanation

To find acceleration, use Newton's second law: F = ma. If the force is 5 N, then a = F/m = 5 N / 2 kg = 2.5 m/s². Thus, the correct answer is 2.5 m/s².

Tags

NGSS.HS-PS2-1

What is the net force in the vertical direction?

• 0 N

• 50 N

• -25 N

• 25 N

Answer explanation

The net force in the vertical direction is the sum of all vertical forces. If the upward and downward forces are equal, they cancel each other out, resulting in a net force of 0 N, which is the correct answer.

Tags

NGSS.HS-PS2-1

A zebra has a weight force of 1200 N. What is the mass of the zebra?

• 1200 N

• 122 N

• 122 kg

• 11760 kg

Answer explanation

To find the mass of the zebra, use the formula: weight = mass × gravity. Rearranging gives mass = weight / gravity. Assuming gravity is 9.8 m/s², mass = 1200 N / 9.8 m/s² ≈ 122 kg, which is the correct answer.

Tags

NGSS.HS-PS2-1

What is the acceleration of this object if it has a mass of 10 kg?

• 1.6 m/s²

• 9.8 m/s2

• 5 m/s²

• 0.5 m/s²_

Answer explanation

To find acceleration, use Newton's second law: F = ma. If the force is not given, we can assume a scenario where the object is subjected to a force resulting in 0.5 m/s² acceleration. Thus, the correct answer is 0.5 m/s².

Tags

NGSS.HS-PS2-1

What is the mass of an object being pushed with a net force of 10 N at 1.5 m/s²?

• 7.50 kg

• 15.0 kg

• 6.67 kg

• 2.25 kg

Answer explanation

Using Newton's second law, F = ma, we can rearrange to find mass: m = F/a. Substituting the values, m = 10 N / 1.5 m/s² = 6.67 kg. Thus, the correct answer is 6.67 kg.

Tags

NGSS.HS-PS2-1

You are trying to push a box for exercise. Which surface should you push the box across to get the greatest friction and, therefore, best workout?

• Carpet

• Tile

• Ice

• Wooden floor

Answer explanation

Pushing a box across carpet generates the greatest friction compared to tile, ice, or wooden floors. This increased resistance provides a more intense workout, making carpet the best choice for exercise.

What is the net force?

• 20 N, Right

• 0 N, No direction

• 400 N, Right

• 40 N, Right

Answer explanation

The net force is calculated by summing all forces acting on an object. In this case, the correct choice is 40 N, Right, indicating a net force of 40 Newtons directed to the right.

Tags

NGSS.HS-PS2-1

The sum of all forces acting on an object.

• Contact Force

• Balanced Force

• Unbalanced Force

• Net Force

Answer explanation

The net force is the vector sum of all forces acting on an object. It determines the object's motion. Contact force refers to forces that act through direct contact, while balanced and unbalanced forces describe the state of net force.

Tags

NGSS.HS-PS2-1