Unit 4 Newton's First Law Lesson 3

Poll

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

• Applied

• Gravity

• Normal

• Friction

• Tension

Poll

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

• It would fall

• It would stay where it is

• It would float up like a balloon

Poll

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?

• It would eventually slow down and stop.

• It would keep going at the same speed and would not accelerate

• It would speed up forever

Where Are Voyager 1 and 2 Now? - NASA Science

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Multiple Choice

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

• There is no friction or gravity acting on it in deep space.

• It has an engine that keeps it moving.

• It is being pulled by the Sun's gravity.

• It is pushed by solar wind.

Poll

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

• You would stay still nothing would happen to you

• You would move backwards away from the rock

• You would move forward with the rock

Poll

5. Which of these objects will be accelerating?

• Red square

• Green square

• Orange square

• Blue square

Poll

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?

• The both stop together

• The car stops and the block keeps moving

Multiple Choice

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

• It keeps you from being thrown forward if the car stops suddenly.

• It helps you drive faster.

• It makes the car more comfortable.

• It helps you see better.

Poll

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?

• It would fall back through the sunroof.

• It would miss the sunroof and fall behind the car

• It would miss the sunroof and fall infront of the car.

Open Ended

When seen in slow motion why does the balloon hold its shape for a moment after the balloon is popped?

Poll

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

• Truck

• Sports Car

• Both require the same force

• It depends on the color

Poll

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

• 100 ft (about 3 large school buses)

• 100 yards

  (soccer, football field)

• 1000 yards

• 1 mile (1760 yards) distance to chick-fil-a

Poll

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. )

• 8 N of force because you need to apply force that equals the mass x the velocity

• 2 N of force because you need to apply force that equals the velocity divided by the mass

• 0 N of force because there is no acceleration and 1st law states that no force is required to keep an object moving at the same rate

Poll

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

• The rock's speed is constant

• The rock is speeding up

• The rock is slowing down

Draw

What is the net force when the rock hits the water?

Draw a free body diagram

Poll

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

• The rock's speed is constant

• The rock is speeding up

• The rock is slowing down

Poll

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