Newton’s Laws Conceptual Questions

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Presentation transcript:

Newton’s Laws Conceptual Questions Discuss the answers as a group and have someone record your answer on a piece of paper. Include all your names on it.

Newton’s First Law The Law of Inertia

If you were in a spaceship and fired a cannonball into space, how much force would have to be exerted on the ball to keep it moving once it has left the spaceship?

Use the Law of Inertia to explain why the water stays in the bucket. When you spin a bucket of water around in a vertical circle none of the water spills out. Use the Law of Inertia to explain why the water stays in the bucket.

Describe its motion relative to the wagon. Suppose you place a ball in the middle of a wagon, and then accelerate the wagon forward. Describe the motion of the ball relative to the ground. Describe its motion relative to the wagon.

How does the Law of Inertia explain how concussions happen?

A metal ball is put into the end of the tube indicated by the arrow A metal ball is put into the end of the tube indicated by the arrow. The ball is then shot out of the other end of the tube at high speed. Pick the path the ball will follow after it exits the tube. Note – you are looking down on these tubes, they are not vertical.

What if a hand pushes down on the book with a force of 20 N? How much support force does a table exert on a book that weighs 15 N when the book is placed on the table? What if a hand pushes down on the book with a force of 20 N? What if a rope lifts up on the book with a force of 10 N? (The hand is no longer there.)

What will be the net force acting on the crate? If the force of friction acting on a sliding crate is 100 N, how much force must be applied to maintain a constant velocity? What will be the net force acting on the crate? What will be the acceleration?

If suddenly the force of gravity of the sun stopped acting on the planets, in what kind of path would the planets move?

Newton’s Second Law Force = mass x acceleration

If the forces exerted on a 2-kg object are 50 N east and 30 N west, what is object’s acceleration?

Suppose a cart is being pushed by a certain net force Suppose a cart is being pushed by a certain net force. If the net force is doubled, by how much does the acceleration change?

Suppose a cart is being moved by a certain net force Suppose a cart is being moved by a certain net force. If a box is dumped into the cart, so its mass is doubled, by how much does the acceleration change?

A student calculated the acceleration of her blowgun dart to be 400 m/s2. If the dart weighs 0.008 kg, what was the force of air provided by her lungs?

What is the net force acting on a 10 kg freely falling object? What is the net force when it encounters 15 N of air resistance? How much air resistance does it experience when it falls at terminal velocity?

If you pulled a low but heavy sled with a rope and greased the bottom to reduce friction, would it help more to use a short rope or a long rope? Why?