What is the unit of measurement for force?

• N

• kgm/s2

• Both A and B

Answer explanation

The unit of measurement for force is the Newton (N). It is defined as kg·m/s², but the standard unit is simply N. Therefore, the correct answer is N.

Amy and Zach are pulling the teacher’s table to fix its position. What type of force is exhibited by Amy and Zach?

• Tension Force

• Applied Force

• Normal Force

Answer explanation

Amy and Zach are exerting force to move the table, which is an example of an applied force. This type of force is used when a person pushes or pulls an object to change its position.

Shaine and Marco jumped from an airplane to skydive and used a parachute for safe landing. Parachuting involves the force of air resistance in which its direction is ________ to the motion of the object.

• Similar

• Opposite

• Perpendicular

Answer explanation

In parachuting, air resistance acts against the direction of motion. Therefore, the force of air resistance is opposite to the downward motion of the parachutist, making 'Opposite' the correct choice.

Which of the following can be a result in the state of motion of balanced forces?

• A moving object will speed up or slow down.

• A moving object will continue to move at a constant velocity.

• A moving object will change its direction.

Answer explanation

Balanced forces result in no net force acting on an object, meaning it will continue to move at a constant velocity. This is why the correct choice is that a moving object will continue to move at a constant velocity.

Preston exerted 10N to pull the chair to the left. Daniel helped Preston to pull the chair in the same direction by applying 14N of force. Determine the net force.

• 24N, to the left

• 24N, to the right

• 4N, to the left

Answer explanation

To find the net force, add Preston's 10N and Daniel's 14N since they are pulling in the same direction. 10N + 14N = 24N, to the left. Therefore, the net force is 24N, to the left.

Jason, Michael, and Anderson are comparing the inertia of their objects. Jason has a module. Michael has a pen, while Anderson has a notebook. Whose object has the greatest inertia?

• Jason

• Michael

• Anderson

Answer explanation

Inertia depends on mass; Jason's module is likely heavier than Michael's pen and Anderson's notebook, giving it the greatest inertia. Therefore, Jason's object has the greatest inertia.

It is the rate and direction of a moving object.

• Speed

• Acceleration

• Velocity

Answer explanation

Velocity is defined as the rate and direction of a moving object, making it the correct choice. Speed only measures how fast an object is moving, without considering direction.

If the same amount of force is acting on two objects, the one with the greater mass will have a lower acceleration.

• True

• False

• Cannot be determined

Answer explanation

According to Newton's second law (F=ma), if the same force is applied, a greater mass results in lower acceleration. Therefore, the statement is true.

Liz and Sixto are pushing a bookshelf that has a mass of 12kg at 2m/s2. If Sixto is already exerting a force of 11N, how much force is Liz exerting?

• 6N

• 13N

• 24N

Answer explanation

To find the total force, use F = m * a. Here, F = 12kg * 2m/s² = 24N. Sixto exerts 11N, so Liz must exert 24N - 11N = 13N. However, the correct answer is 6N, indicating a possible error in the question or choices.

Tan and Riu watched a test flight of a small rocket that was about to go to space. If there was a 276N of force acted upon on the rocket that has a mass of 23kg, what is the acceleration of the rocket?

• 24m/s2

• 18m/s2

• 12m/s2

Answer explanation

To find the acceleration, use Newton's second law: F = ma. Rearranging gives a = F/m. Here, a = 276N / 23kg = 12m/s². Thus, the correct answer is 12m/s².