Newton's 1st Law (Inertia)
Newton's First Law of Motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force change the motion. This is sometimes called the law of
What is inertia?
How does Newton describe the dependence of acceleration of an object on its mass and the net applied force?
What is the acceleration of the object are directly proportional (related) to the force applied to the object.
When you jump off the ground, what pushes you upward?
What is the ground pushes upward on you?
What is Net Force?
What is The total of all forces acting on an object
Which force usually causes moving objects to slow down in real life?
What is Friction?
Your car breaks down. As your friends help you push it, it begins to move and speed up. What law is demonstrated?
What is Newton's 1st Law of Motion?
Based on Newton's 2nd Law, using the same force but reducing the mass of an object results what changes in motion?
A gun moves backward while firing a bullet is an examle of which of Newton's Laws? Explain.
The bullet is forced forward with the same amount of force that the gun pushes back on the person.
Using two spring scales, students pull on opposite sides of a dynamic cart at rest. 5 Newtons of force is pulling left and 5 newtons force is pulling right. Describe the motion of the cart?
What is the cart will not move?
Why do seatbelts protect passengers during sudden stops?
What is they counter inertia by applying a force to stop the passenger’s motion?
A book is sitting on a desk and does not move. Which force is keeping it from falling?
What is normal force? (The upward force from the desk.)
Beth wants to maximize her chances of winning the bowling tournament so she tests several balls to find the best fit. She exerts the same 14 N of force to propel the bowling ball down the lane. Will a 3.2 kg, 3.6 kg, 4.1 kg, or 4.5 kg ball provides the fastest acceleration?
What is the 3.2 kg ball?
A swimmer pushes water backward and moves forward. Which force pair is involved?
What is Swimmer pushes water backward; water pushes swimmer forward
A box has a 10 N force pushing right and a 6 N force pushing left. What happens to the box?
What is net force is 4 N to the right, so the box accelerates right?
What is the boat will not move until an unbalanced force is applied?
What is the boat will accelerate a rate based on the applied force?
What is as the paddles push the water back, the boat moves forward?
A skateboarder hits a rock and stops suddenly, but the rider keeps moving forward. Which explanation best fits Newton’s First Law?
What is the rider’s body continued moving due to inertia while the board stopped
An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, what will happen according to Newton's 2nd Law of Motion
What is the lighter truck increases speed more quickly.
While driving down the road, this tiny hummingbird hit the windshield of a Maria's car. This is a clear case of Newton's third law of motion. The hummingbird hit the car and the car hit the hummingbird. How can you describe the force on both the hummingbird and the car's windshield (the hummingbird was unharmed).
What is the forces are equal and opposite?
Consider a person sliding down a water slide at constant velocity.
Are the forces are balanced or unbalanced? Explain.
What is the forces are balanced? The net force is zero because the person is moving at a constant velocity.
When pushing a child on a swing, you must give them a push periodically to keep them moving. This seems to go against the law of inertia and the conservation of energy.
What explains why the child needs a push periodically to keep moving?
What is FRICTION is the opposing, unbalanced, outside force that slows the swing down.
Two objects with different masses are sitting still. When no forces act on them, which statement is correct?
What is both remain at rest regardless of mass because no unbalanced net force acts on them.
A student claims a heavier object always moves faster. Using Newton’s Second Law, how do you explain why this claim is incorrect?
What is the heavier mass requires more force to accelerate; speed depends on net force and mass, not mass alone.
A rocket accelerates upward even though there is no air in space. Which explanation best supports Newton’s Third Law?
What is exhaust gases pushed downward cause an equal and opposite upward force on the rocket
Beth exerts 14 N of force to propell a 4.5 kg bowling ball down the lane. Describe how the ball will travel.
What is the The bowling ball accelerates toward the pins at 3.1 m/s2 .
When you are pushing a shopping cart in a grocery store, explain how net force and mass work together to affect acceleration.
Responses should include pushing a loaded requires more force to accelerate the cart vs. empty shopping cart requires less force.