Physics Questions 2nd law

A box with a mass of 20 kg is being pulled across a floor with a force of 50 N. If the force of friction is 10 N, what is the acceleration of the box?

• 1 m/s²

• 2 m/s²

• 3 m/s²

• 5 m/s²

What motion will result from two forces acting on an object: one force of 50 Newtons to the east, the other a force of 30 Newtons to the west? The object will –

• move east at a constant speed.

• accelerate to the east.

• move west at a constant speed.

• accelerate to the west.

Which of the following describes an application of Newton’s law of inertia?

• A car stops suddenly, but the passengers in the car are thrust forward into the seat belts.

• The force pushing downward on a box is equal to the force pushing upward on the box.

• Earth’s tectonic plates collide with equal force and equal acceleration.

• The force of gases pushing downward from a rocket launches the rocket upward against gravity.

What is the most reasonable prediction for the gravitational force of a falling object with a mass of 3.0 kg? (Acceleration is 9.8 m/s²)

• 27.0 N

• 29.4 N

• 33.1 N

• 36.8 N

Calculate the acceleration of a 215 kilogram loaded dog sled pulled by six dogs if each dog applies a net force of 85 newtons to the sled.

• 2.37 m/s²

• 42 m/s²

• 0.056 m/s²

• 0.134 m/s²

Calculate the acceleration of a 0.0459 Kilogram golf ball when hit with a 17,500 newton force.

• 381263.6 m/s²

• 48000 m/s²

• 50 m/s²

• 15 m/s²

An object with a mass of 9 kg accelerates 3 m/s² when an unknown force is applied to it. What is the unknown force?

• 12 N

• 27 N

• 27 Kg

• 6 N

The block below moves on a frictionless surface at 6.2 m/s². Determine the mass of the block.

• 1.3 Kg

• 18 Kg

• 18.3 kg

• 25 Kg

If the same force is applied to each of the balls pictured below, which one will have the LEAST acceleration?

• A. A

• B. B

• C. C

• D. D

A force of 80 Newtons is applied to a mass resulting in an acceleration of 16 m/s². What force would need to be applied to this mass to cause an acceleration of 30 m/s²?

• A. 15 N

• B. 60 N

• C. 125 N

• D. 150 N