Unit 4 Newton's First Law Lesson 3

1. What is the outside force that causes a moving soccer ball to stop? (It is not touched by another player)

2. Supposing you were in space in a weightless environment, what would happen if you dropped an object (you did not add any force)?

3. Imagine a place in space far from all gravitational and frictional influences. Suppose that you visit that place and throw a rock. What will the rock do?

Which of the following best explains why the Voyager spacecraft continues to move through space without stopping?

4. After the rock is thrown in space, what happens to you? (This is actually 3rd Law)

5. Which of these objects will be accelerating?

6. A toy block is on top of a toy car and they are moving together at the same speed. What happens to the block when the car suddenly stops?

Why is wearing a seat belt important when driving a car?

Imagine you are driving slowly in a car and you throw a ball up into the air through a sun roof. What would happen to the ball?

Which vehicle in the image requires more force to get up to speed, the truck or the sports car?

Freight trains are massive - How far in feet do you think it will take a train to stop?

9. A 2-kg object is moving horizontally with a speed of 4 m/s. How much net force is required to keep the object moving at this speed and in this direction? (Ms. Schwartz’s very favorite tricky question - EVER. )

13. What is happening to the rock’s velocity as it falls?

11. What happens to the velocity when the rock hits the water?

14. Which one of the velocity-time graphs best describes the motion of the object?