Motion and forces
When applying the same force to a baseball and a filing cabinet, which one will accelerate at a faster rate?
the baseball
What is the term for the 'invisible force' that holds you to Earth's surface?
gravity
What indicates how fast something is moving?
speed
When you roll a ball across a rug, what slows it to a stop?
Friction resists the ball’s forward motion.
The Moon's mass is lower than Earth's, so its gravity is ____ Earth’s gravity.
less than
Among a dump truck, tennis ball, sports car, and bicycle, which object would need the greatest force to overcome its inertia?
a dump truck
How can gravity affect the speed of an object?
It will slow it down.
Which of the following is described by the change in an object’s position?
motion
How are the effects of inertia felt when you are on a roller coaster ride?
You are pushed back in your seat as you move.
What is your favorite Thanksgiving food?
Answers vary.
How far can a car travel in three hours if it maintains a constant speed of 55 miles per hour?
Why would you weigh more on Jupiter than you do on Earth?
Jupiter’s mass is greater than Earth’s, so its gravitational pull on your mass is stronger.
What is affected by forces acting upon an object as well as the mass of the object?
acceleration
Without an unbalanced force, what will an object do?
maintain its velocity
Which of the following forces could be used in electronic devices?
magnetic
What force slows or prevents the movement of objects that are in contact with each other
friction
To change the position of a football, what does a football player need to do?
Apply force greater than the force of gravity.
If a bicycle that is traveling at 5 mph speeds up to 10 mph in 5 seconds, what is the bicycle’s acceleration?
1 mph/s
Once an object is in motion, what type of energy is being used?
kinetic energy
What causes passengers in a car to move forward when the car comes to a sudden stop?
inertia