Motion Graphs
A change in position is known as _________
Motion
What is the formula for speed?
S=D/T
Forces that cause a change in motion are known as ______________
unbalanced forces
What does Newton's 1st law state?
An object in motion will remain in motion and an object at rest will remain at rest until acted on by an unbalanced force.
Any push or pull exerted on an object is known as ______
Force
In a distance vs time graph, a steeper slope means _____________
Faster speed
Bob runs 25 meters in 5 seconds. What is his average speed?
5 m/s
Balanced forces can be described as __________
-Have a net force of zero
What does Newton's 3rd law state?
For every action there is an equal and opposite reaction.
The standard unit of force
Newtons
What does a horizontal line represent on a distance vs time graph
No motion
A car accelerates to 60 mph from rest in 4 seconds. What is the car's acceleration?
acceleration = 15 m/s2
Balanced or unbalanced: two people push on a box from opposite sides with equal force
Balanced force
Which of Newton's Laws is known as the action-reaction law?
Newton's 3rd law
How do you calculate net force?
subtract opposite direction forces, and add same direction forces to get the total
On a speed vs time graph, what does a downward slope represent?
Speed is decreasing
Acceleration can mean what three things?
-increasing speed
-decreasing speed
-changing direction
Balanced or unbalanced?:
The gravitational force on a box is 900 N downwards. The normal force on the box is 900 N upwards. Two people also push on the box from opposite sides (left and right) with 30 N of force.
Balanced because the net force is zero
A car comes to a sudden stop, but all of the passengers continue to move forward. Which of Newton's laws explains this?
Newton's 1st Law (inertia)
Student A is pushing a box with a force of 20N to the right. Student B is pushing with a force of 25 N to the left. What is the net force (include direction) in this situation?
On a position vs time graph, the line going away from zero shows __________________
The object moving away from it's starting point
If a dog accelerates from rest at 6m/s2 in 5 seconds, what is the dog's final velocity at the end?
30 m/s
A car drives around a curve at a constant speed of 20m/s. Is this action representing a balanced or unbalanced force?
Unbalanced because the car is changing direction which indicates acceleration
Which law?
A wagon full of rocks requires more force to pull than an empty wagon
Newton's 2nd Law
Determine the net force (include direction):
A girl is pushing right with 40 N of force. A boy is pulling right with 50 N of force. There is a frictional force of 25 N to the left.
65 N to the right -->