A book is sitting on a dashboard of a car that's stopped at a traffic light. As the car starts to move forward, the book slides off the dashboard. This is an example of which law?
What is the first law?
100
What is the formula for speed?
What is distance divided by time?
100
Using the terms air resistance, surface area, and gravity, explain how a parachute works.
answers vary
200
What are the two causes of friction?
What are microscopic cracks and bumps, and static.
200
When two equal forces act on the same object in opposite directions, the net force is....
What is zero?
200
When you blow up a balloon and the pinch the open end closed and then let it go sending the balloon zooming all over the room this is an example of which law?
What is the third law?
200
If a bird has a velocity of 3 m/s west, what is its speed?
What is 3 m/s?
200
Which of these examples are a push and which are a pull?
rocket launching
golf club hitting a ball
parachute
rocket launching - push
golf club hitting a ball - push
parachute - pull
300
Friction acts in the direction __________ of an object's motion.
What is opposite?
300
Give an example of an unbalanced force.
answers vary
300
A fish swimming through water pushes water backwards with its fins. The water propels the fish forward. Which law does this represent?
What is the third law?
300
Velocity is both speed and ___________?
What is direction?
300
Why do objects that are thrown follow a curved path?
The force of gravity is pulling the object down and well as the fluid friction slowing it down.
400
Explain why a flat sheet of paper dropped from a height of 2 meters will not accelerate at the same rate as a sheet of paper crumpled into a ball.
Answers will vary.
400
A Newton is a unit of _________.
What is force?
400
A male giraffe has a large heavy head that is used to strike other males with tremendous force during confrontations. This is an example of which law?
What is the second law?
400
What are the three ways you can accelerate?
What is increasing speed, decreasing speed, and changing direction?
400
If a vehicle is traveling at 6 m/s/s east and has a mass of 115 kg, what is the force?
What is 690 kg . m/s/s?
500
Explain why a slippery substance like oil will reduce friction?
Because the slippery substance fill in the microscopic cracks reducing the friction.
500
How does mass differ from weight?
Mass is the amount of matter in an object. Weight is the amout of gravitational force on an object.
500
Seatbelts were invented to protect people. This is a result of which law?
What is the first law?
500
Why could it be important to use velocity instead of speed when you decribe how a storm is moving?
If a tornado or storm is coming your way then you will want to know so that you can prepare or evacuate.
500
The force of ____________ acts between all objects in the universe.