2.1 Motion, Reference Points, Distance & Displacement
2.2-2.3 Speed, Velocity, & Acceleration
2.5 Forces & 2.7 Newton's Laws
2.6 Contact & Noncontact Forces
100
An object's place is space is it's ___.
position
100
How is velocity different from speed?
Velocity includes direction.
100
The unit used to measure forces is the:
Newton
100
What is the difference between contact and noncontact forces?
Contact forces require touching; noncontact forces act at a distance.
200
What is a reference point, and why do we need it to describe motion?
A stationary object used to determine if another object has changed position. If the reference point isn't still, it is hard to decide whether the other object is in motion.
200
A runner keeps a constant speed but changes direction around a curve. What happens to their velocity?
It changes because direction changes.
200
What happens to motion when a force is balanced?
There is no change in motion (object stays at rest or moves at a constant speed)
200
Name one of each type of force.
Possible answers:
Contact: muscular, friction, normal, applied, tension, spring, air resistance
Noncontact: gravity, magnetic, electrostatic, nuclear, weak
300
What’s the difference between distance and displacement?
Distance = total path traveled; Displacement = straight-line change from start to finish with direction.
300
A car goes from 10 m/s to 30 m/s in 5 s. What is its acceleration?
Formula for acceleration: (final velocity - initial velocity)/time →
(30 − 10) ÷ 5 = 4 m/s²
300
State Newton's 3 Laws.
1st - An object at rest stays at rest unless acted on by another force. An object in motion stays in motion unless acted on by another force.
2nd - The more force you use, the more an object speeds up. If something is heavier, it needs more force to speed it up.
3rd - For every push or pull, there is an equal and opposite push or pull back.
300
How does friction help you walk?
It provides grip between your shoes and the ground.
400
If a car drives 300 m east and 200 m west, what is its distance and displacement?
Distance = 500 m; Displacement = 100 m east.
400
Draw or describe what a speed–time graph would look like for an object slowing down.
*You do not need to know that the curved slope = not constant acceleration.
400
A 2 kg object accelerates at 3 m/s². What is the net force acting on it?
F = m × a → 2 × 3 = 6 N
400
When students compete in tug-of-war, they are using this type of force.
Muscular force
500
A person walks one lap around the high school track. How far did they travel, & what is their displacement.
They traveled 1/4 mile (because it takes 4 laps to make a mile). Their displacement = 0 because they ended where they began.
500
Name & describe the four types of acceleration.
Positive acceleration - speeding up
Negative acceleration - slowing down
Uniform acceleration - traveling at a constant speed
Nonuniform acceleration - speed changing irregularly
500
Explain how Newton’s Third Law applies during a bumper car collision.
Each car exerts an equal and opposite force; both move as a result of the interaction.
500
This force (one of the strongest in the universe) keeps protons & neutrons together in an atom.
Nuclear force