Calculate the average speed of a cheetah that runs 140 meters in 5 seconds.
What is 28 meters/second
100
The reluctance of any body to change its state of motion
What is inertia
100
How much work is done on a 500 N rock that is moved a distance of 4 meters.
What is 2000 Joules
100
inertia in motion
What is momentum
100
The energy stored in an object as a result of its position
What is gravitational potential energy
200
Calculate the speed of a skateboarder who accelerates from rest for 3 seconds down a ramp at an acceleration of 5 m/s2.
What is 15 meters per second
200
The weight of an 80 kg object
(use 10 m/s2 for g)
What is 800 Newtons
200
Forklift A can raise an object two times faster than Forklift B. How much more power does forklift A have than forklift B.
What is twice the power
200
How does an airbag decrease the force of impact during a collision.
What is increasing the time of impact
200
1/2 mass x velocity squared
What is kinetic energy
300
A lightbulb uses 3000 J of energy every 3 seconds. Find the wattage of the bulb.
What is 1000 W
300
A 2 kg blob of clay moving at 3 m/s slams into a 2 kg blob of clay at rest. Find the speed of the two stuck together blobs immediately after impact.
What is 1.5 m/s
300
A 100 N object is raised to a height of 10 meters at the top of a cliff. It is dropped from the cliff. What is the object's kinetic energy just before it hits the ground?
What is 98,000 Joules
400
How can a rocket move in space
What is rocket pushes gas and gas pushes rocket
400
A crane can lift a 200 kg piano up to a second story window 8 meters from the ground in 15 seconds. Find the power of the crane.
What is 1045 W
400
A 1000 kg car moving at 20 m/s slams into a building and comes to a halt. What impulse acts on the car?
What is 20,000 N/s
400
A car skids to a stop over 40 meters when the brakes are applied at 60 km/hr. How far would the same car skid if it were traveling 120 km/hr or twice as fast?
What is 160 meters
500
Skelly, the child skater is propelled by rocket power. Skelly and the rocket have combined mass of 25 kg. When the thrusting force is 100 N and friction is 20 N, what is Skelly's acceleration?
What is 3.2 m/s2
500
Find the efficiency of a crane that can lift a 30 kg weight 15 meters in 3 seconds and requires 10,000 J of energy to complete the task.
What is 44 %
500
A 5 kg fish is swimming at 1 m/s and swallows a 1 kg fish at rest. What is the speed of the large fish immediatelyy after swallowing the small fish?
What is 5/6 m/s
500
A lady is falling from a burning building into a fireman's net below. Before the fall she had 10000 J of potential energy. What is her kinetic energy 1/2 way down to the net?