Forces
What is the force that slows objects down?
Friction
If a car travels 100 meters in 5 seconds, what is its speed?
20 m/s
What does a flat line on a distance-time graph indicate?
no motion stopped
What is the property of matter that resists a change in motion?
Inertia
The Seat Belt Law- why you need a seat belt
First Law or Law of Inertia
What is the proper unit for Force?
Newton (N)
What does it mean if acceleration of an object is a negative?
It's slowing down or decelerating
In a distance-time graph, what does a slope represent?
speed
Which of Newton’s Laws can describe why a semi truck would roll faster down a hill compared to a bicycle?
The Second Law or Accelertion
A balloon is released and flies through t room and the air goes the opposite way.
Third law or Action/Reaction
What is the net force if a 10 N force to the right is balanced by a 10 N force to the left?
0 Newtons (zero N)
How much force is needed get a 100 kg rock to accelerate at 5 m/s2 ?
500 Newtons
Describe the motion representing by slope of this line in a speed-time graph.
It's accelerating, speeding up, then slows down
Third Law OR Action/Reaction
If a golf ball and ping pong ball are thrown with an equal force, then the golf ball would hurt more.
Second Law or F = ma
What is the netforce of the block below?
5 N Right
If an object has a mass of 250kg and an acceleration of 10 m/s/s, what is the force?
2500 Newtons
What is the speed of this object representing by this distance-time graph?
2 m/s
When two objects collide, is the mass or size of the object more significant?
Mass
When the bus moves forward, my body sinks back into the seat.
First Law or Inertia
What happens to the motion of an object when there are unbalanced forces acting on it?
It will CHANGE motion:
direction, speed up OR slow down etc.
Calculate the acceleration if a car speeds up from 20 m/s to 50 m/s in 10 second?
3 m/s²
or
3 m/s/s
What does it mean when the line on a speed-time graph is horizontal?
It's moving at a constant speed.
In the equation F = mxa, what is the relationship between force and mass?
The greater the mass, the more force needed
Direct relationship
When I paddle a canoe on the right, it turns to the left
Third law or Action/Reaction