Forces & Motion Unit Test

Study the pictures of magnets on a post. 1) Explain the forces applied in System A. 2) Explain the forces applied in System B.

Two teams are playing tug-of-war with a mud pit in the middle. Team A pulls on the rope with 1,800 N of force. Team B pulls on the other side of the rope. How much force does Team B need to use in order to pull Team A into the mud?

A soccer ball is sitting on the ground. 1. What, if any, forces are acting on the ball when it is sitting on the ground?

A person sitting in a chair on a frictionless surface throws a heavy ball forward. As a result, the person and the chair move backward. 1) How does this scenario illustrate Newton’s third law of motion? 2) What would happen if instead of a heavy ball, the person threw a lighter ball with the same force? 3) Could the person increase how far they move backward, and if so, how?

A physics class is exploring the effects of force and mass on acceleration by conducting experiments with toy cars of different weights. The students use the same amount of force to push both a lightweight toy car and a heavyweight toy car across a smooth surface. Examine how the mass of the toy cars affected their acceleration with the same applied force. 1) What predictions can you make about the relationship between mass and acceleration? 2) Discuss why applying the same force to the cars resulted in different accelerations. How does this demonstrate Newton’s second law of motion? 3) Analyze how Newton's first law of motion could be observed in the experiment if one of the cars was initially at rest. What does this tell you about the object’s motion?

In a science fair project, a student designs an experiment to test how different materials affect the strength of a magnet. He uses various materials like plastic, glass, aluminum, and wood, placing them between 2 magnets and measuring the force with a spring scale. 1) What hypothesis do you think the student might be testing in this experiment? 2) Based on your understanding of magnets, which material would you predict to have the least effect on the magnetic force, and why? 3) How can the results of this experiment be applied in real-world situations?

Imagine you and your friends are playing a game of tug-of-war in the park. You notice that when both sides pull equally hard, the rope doesn’t move, staying balanced between both teams. But as soon as one side pulls harder, the rope moves in that direction. This tug-of-war represents forces acting in opposition and how motion occurs when forces are unbalanced. 1) What forces are opposing each other in the game of tug-of-war? 2) Describe what happens when the forces exerted by the 2 teams are equal. 3) Explain why the rope moves in the direction of one team when they begin to pull harder.

Choose the correct statement below to explain what force is acting on a car rolling down an inclined plane? Explain your reasoning.

In an experiment where a tennis ball collides with a stationary object, what happens to the ball’s motion immediately after impact?

• It accelerates at a constant rate.
• It continues in the same direction without any change
• Its speed decreases and direction may change
• It stops moving completely

What principle of physics is exemplified by the structure of the Huddlestone Arch?

• Aerodynamics
• Gravitational pull of the moon
• Magnetic forces
• Balance of forces