Newton's First Law examples Grade 11

📚 Quick Study Guide

• 🍎 Newton's First Law (Law of Inertia): An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a force.
• 🚗 Inertia & Mass: Inertia is directly proportional to mass. The more massive an object, the greater its inertia.
• 🚀 Mathematical Expression: There's no single formula, but conceptually: If $\sum F = 0$, then $a = 0$ (where $\sum F$ is the net force and $a$ is acceleration).
• 🌐 Frames of Reference: Newton's First Law is valid in inertial frames of reference (i.e., frames that are not accelerating).
• 💡 Real-World Considerations: In everyday scenarios, friction and air resistance are forces that often need to be considered.

Practice Quiz

1. A hockey puck slides across the ice at a constant velocity. Which statement best describes the forces acting on it?
   1. There are no forces acting on the puck.
   2. The forces are balanced.
   3. There is a net force in the direction of motion.
2. Which of the following objects has the most inertia?
   1. A baseball.
   2. A bowling ball.
   3. A basketball.
3. A car is moving at a constant velocity. What happens if the driver slams on the brakes?
   1. The car continues to move at a constant velocity.
   2. The car slows down due to an external force.
   3. The car speeds up due to inertia.
4. An astronaut is floating in space. If they throw a wrench, what will happen to the astronaut?
   1. The astronaut will remain stationary.
   2. The astronaut will move in the opposite direction of the wrench.
   3. The astronaut will move in the same direction as the wrench.
5. Which of the following scenarios best illustrates Newton's First Law?
   1. A ball rolling down a hill.
   2. A book sitting on a table.
   3. A rocket launching into space.
6. Why do we wear seatbelts in cars?
   1. To increase the car's speed.
   2. To counteract inertia in the event of a sudden stop.
   3. To make the car look more stylish.
7. A tablecloth can be yanked from under dishes on a table without the dishes moving much. This is an example of:
   1. Gravity.
   2. Inertia.
   3. Friction.