Which Law?
A baseball hit with a bat accelerates more than a bowling ball hit with a bat
2nd law
Do balanced or unbalanced force result in a change in motion?
Unbalanced forces
What would a man weight if he has a mass of 60 kg?
588 N
Average speed
Kim travels 300 miles in 4 hours. What is her average speed?
75 mi/hr
A book left on the table overnight is there when you return in the morning
1st Law
What is the acceleration due to gravity on Earth?
9.8 m/s2
The mass of an object is 50 kg moving at 2 m/s2. What is the force?
100 N
What does it mean if an object has a negative acceleration?
It is slowing down
A car travels 2,000 mi at a constant speed of 70 mi/hr. How long did the trip take?
28.6 hrs
A balloon flies forward when air quickly escapes it.
3rd Law
What two factors affect gravitational pull?
Mass and distance between masses
Joe pushes a box with a force of 10 N to the right and Lisa pushes with a force of 3 N to the left. Find the net force applied to the box
7 N to the right
Rate of change in velocity is known as
Acceleration
Find the velocity of a truck that travels 250 miles North to NYC in 5 hours.
50 mi/hr North
The bike you are riding hits a hole and stops quickly but you fly forward
1st Law
This force opposes the force of gravity when objects fall through the hair
Air resistance
25,000 kg * m/s
This describes an object's speed and direction.
Velocity
A runner jogs 60 m on a track towards the finish line, then turns and runs back 20 m. What is her distance and her displacement?
Distance = 80 m
Displacement = 40 m towards the finish line
Describe each of the 3 laws.
1. Law of Motion
2. F = ma
3. Action has an equal and opposite reaction
Friction, gravity, and air resistance
A car accelerates from 20 m/s to 60 m/s in 5s. If the mass of the car is 150 kg, find the force on the car and the final momentum
F = 1,200 N
p final = 9,000 kg * m/s
How is it possible to have a constant speed but a changing velocity?
Change in direction
A babysitter is pushing a stroller from rest and accelerates at a rate of 0.05 m/s2. What is the velocity of the stroller after it has traveled for 285 s?
14.25 m/s