A cat is launched to altitude of 500,000 m above the surface of the earth. The cat travels at an average rate of 700 m/s. How long will it take for the cat to reach orbit?
v=d/t
t=d/v
t= 500000/700 = 714.29 s
200
What does newtons 3rd law state?
That every reaction has an equal and opposite reaction
200
What is acceleration?
a change in a moving object's speed or direction
300
What is displacement and what unit is it measured in?
How far something moves in a certain direction, measured in metres.
300
What is 5 km in cm?
5 km = 5 x 1000 m = 5000 m = 5000 x 100 = 500 000 cm
300
A car travels 30km West in half an hour. What is the average velocity of the car in km/h?
V = 30km/0.5h = 60km/h
300
What is another name for newtons first law?
Inertia
300
If force (N) = mass x acceleration, what are the units for Newtons?
Newtons are measured in kgxm/s/s
400
A cat is running at 3 m/s in a northwest direction.
Does this sentence describe speed, displacement, velocity or distance?
Velocity - how fast something is moving in a certain direction
400
Convert 0.5km/h to m/s
0.5 km = 500 m
1 h = 60 min = 3600 seconds
Therefore 500m/3600s = 0.139 m/s
400
A person travels East 600m before turning West 350m. The whole journey takes 5 minutes. What is the average velocity of the person?
v = d/t
Displacement = 250m east, time = 5 mins
v = 250/5 = 50 m/mins
400
A tennis ball is served, the tennis player on the other side of the net swings at the ball but misses. Which law explains why the ball stays in motion until it hits the fence.
Newtons first law
400
What is the formula for finding acceleration?
Change in velocity / change in time
500
If I was given the velocity and distance of an object, what equation would I use to find the time?
Time = distance/velocity
500
Convert 50 m/s into km/h
50 m = 0.05 km
1 h = 60 x 60 seconds
Therefore: 0.05 km x 60 x 60 = 180 km/h
500
What is the speed of a walking person in m/s if the person travels 1000 m in 20 minutes?
Speed = 1000m /20 min = 1000m / 20 x 60 = 0.83 m/s
500
Miss Jones is driving down the road in her car and she has a glass of water. She has to stop very quickly. What happens (specifically!) to the water in the glass and why?
The water spills on the radio because it has inertia and wants to continue moving forward even though the car has stopped
500
If a person is running in a straight line at 10 m/s, how many seconds does it take the person to run 20m if they have a force of 500 N and a mass of 150 kg?
Speed = distance/time, t = d/s
t = 20m / 10m/s = 2s