Newton's Laws and Force Test Pt 1

The law of inertia states that an object in motion will stay in motion, and an object at rest will stay at rest unless acted upon by an unbalanced force. Which law of motion is this describing?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

The image shows two opposite forces acting on a rope, what can we say is true about the affect of the forces on the rope?

• It cannot be determined without knowing which man is stronger.

• The forces are not balanced, because one man is standing taller than the other.

• The forces are balanced. But, the forces acting on the rope have increased and the rope's motion is affected.

• The forces are balanced. Thus, there is no change in forces acting on the rope and the rope's motion is not affected.

The image shows two opposite forces acting on a rolling cart, what can we say is true about the effect of the forces on the cart?

• It cannot be determined without knowing which man is stronger.

• It cannot be determined because one man is taller than the other.

• The forces are unbalanced, and net force on the cart moves it to the left.

• The forces are unbalanced, and net force on the cart moves it to the right.

Two platoons line up for a tug of war. If both platoons have the same number of participants on a team, what other factor is critical to either platoon's win?

• height of men

• age of men

• total mass of the team

• condition of the ground

Mutt and Jeff are running along a path each pushing a cart loaded with rocks. If Mutt's wagon has a mass two times greater than Jeff's and they want to stay together, arriving at their destination at the same time, what must happen?

• Jeff should slow down so Mutt can catch up.

• Mutt must use half as much force to push his cart.

• Mutt must use twice as much force to push his cart.

• Mutt and Jeff will use the same force, but Mutt will take bigger steps.

Imagine you are on the top of a mountain with four basketballs. The mass of the four basketballs are 100 kilograms, 200 kilograms, 300 kilograms, and 400 kilograms. If the basketballs rolled down the hill, which one would supply the greatest force at the bottom of the mountain (assume that their velocities were equal at the bottom of the mountain)?

• A 100 kilogram basketball

• 200 kilogram basketball

• 300 kilogram basketball

• 400 kilogram basketball

In a bumper car arena, two cars of equal mass are heading straight toward each other. The orange one is traveling at a speed of 5 meters per second. The green one is traveling at a speed of 2 meters per second. Which of the forces most affects the motion of the bumper cars after they collide?

• gravity

• friction

• the other car

• wind resistance

Four balls with different masses. Consider the four masses. Describe the motion of the masses if you used THE SAME amount of force to move each one over THE SAME time.

• The greatest mass would not move at all.

• All four masses would move the same distance.

• The greater the mass, the greater the distance the mass would move.

• The lower the mass, the greater the distance the mass would move.

Ben helped his parents load boxes and furniture onto a moving truck. He easily carried several boxes out of the house and up a ramp into the truck. Then he loaded small pieces of furniture by pushing them up the ramp. Finally, Ben tried to move the refrigerator. He pushed and pushed, but it did not move. Why did the refrigerator not move?

• because the refrigerator was so tall

• because there was no wheels on the refrigerator

• because Ben was tired from moving the boxes and furniture

• because the refrigerator was much heavier than the other objects

Newton's second law can be expressed as a mathematical formula for the amount of force needed to accelerate an object. The formula is force equals mass times acceleration, or, F=ma. James is trying to prove Newton's 2nd law of motion. He tries to move four different objects with different masses from point A to point B.

The objects are a toy car, a car, a refrigerator and a kitchen table. James finds that it takes the least amount of force to move the

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