Distance and Displacement
Distance is
how far an object has moved
Velocity is
Acceleration is
a rate of change of velocity over time
an object in motion stays in motion, and object at rest stays at rest UNLESS a net force acts on an object
Friction is determined by which three factors?
Roughness, force, and surface area
Displacement is
distance and direction of an object's change in position
A girl is training to run a 5k (3.1 mile) race. If she runs a trial race in 0.5 hours, what is her average speed
6.2mi/hr
A car traveling 35 km/hr accelerates to a speed of 45 km/hr in 0.25 hr. What is its acceleration?
40km/hr^2
Newton's 2nd Law and the formula
A net force acting on an object causes the object to accelerate in the direction of the net force.
F=ma
Air resistance is determined by which three factors?
Speed, size, shape
Distance- 70 meters
Displacement- 30 meters
An elevator at a museum can travel 210 m upwards in 35 s. What is the elevator’s velocity?
6m/s upwards
A jet is traveling at 80 m/s when it starts to approach a runway. It is able to land and park in 10 s. What is its acceleration?
-8m/s^2
Newton's 3rd Law
every action has an equal and opposite reaction
Terminal Velocity is when air resistance and gravity become
Balanced, and have a net force of 0.
A car drives 10 miles North, 5 miles West, then 10 miles South. What is its distance and displacement?
Displacement- 5 miles
How far does a car travel in .75 hrs if it is moving at a constant speed of 45 mi/hr?
33.75 miles
A skateboarder has an acceleration of 1.5 m/s2. Starting from rest, if he accelerates for 2 s, what speed will he reach?
3m/s
You are pushing a friend on a sled. You push with a force of 40N. Your friend and the sled together have a mass of 80 kg. Ignoring friction, what is the acceleration of your friend on the sled? (Newton's 2nd Law)
0.5 m/s^2
What is the momentum of a car with a mass of 1300 kg traveling at a speed of 28 m/s?
36,400 kg*m/s
A jet travels 200 miles South, then 100 miles East. What is its distance and displacement?
Distance: 300 miles
Displacement: 223.6 miles
If a motorcycle is moving at a constant speed down the highway of 40 km/hr, how long would it take the motorcycle to travel 10 km?
0.25 hr
A car accelerates from a standstill to 60 km/s in 10 s. What is its acceleration?
6km/s^2
Find the weight of a suitcase that has a mass of 42 kg.
Hint: what is an object's acceleration due to gravity, disregarding air resistance?
411.6 N
In a collision, a 12kg object moving with a velocity of 4m/s transfers all of its momentum to a 6kg object. What would the velocity of the 6kg object be after the collision?
8m/s