Round 1
Which would hit the ground first if both are dropped from the same height in a vacuum - a feather or a metal bolt?
They would hit the ground at the same time
What are the six steps of the scientific method?
1.
Which of the two objects has the greatest inertia?
1 kg sphere
5 kg cube
5 kg cube
When an object is in free fall, what is the only force acting on it?
Gravity
What is happening to a car that has a negative velocity and a positive acceleration?
It is slowing down.
Which would hit the ground first if both are dropped from the same height in the classroom - a feather or a metal bolt?
The metal bolt
What is the result of an unbalanced force acting on an object?
An acceleration (a change in velocity)
A book is sliding down a slight slant. What kind of friction is acting on the book?
Kinetic friction
How can an action-reaction pair move objects, since the forces are equal?
The forces are acting on different objects.
Is the normal force always straight up on a free body diagram?
No, it is perpendicular to the surface. If the surface is slanted, the normal force will be at an angle.
Which force is greater:
The force of the earth on you
The force of you on the earth
They are the same.
See demonstration. What kind of precision and accuracy is that an example of?
Results may vary.
In what direction does friction act on an object?
Opposite the motion
What is the magnitude of the acceleration due to gravity on earth?
9.8 m/s2
What is the net force on an object that is moving with a constant velocity?
Zero
What is the difference between a scalar and a vector?
If the net force on an object triples, what happens to the acceleration?
It triples
If the mass of an object doubles, what happens to the acceleration?
It cuts in half.
What is the vertical acceleration of a projectile at the top of its flight?
9.8 m/s2
What is an object’s velocity when it is at rest?
0.0 m/s
What is the vertical velocity of a projectile at the top of its flight?
0.0 m/s
A book lays still on a slight slant. What kind of friction is keeping the book in place?
Static friction
In an experiment, it is important to have a high level of:
Precision and Accuracy
A pencil is suspended from the ceiling by an ideal string of negligible mass. Where is the greatest force of tension in the string?
The tension is the same throughout the whole string.
What is happening to a car that has a positive velocity and a positive acceleration?
It is speeding up.