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Motion Calculations
Motion Graphs
Forces Calculations
Forces (Thinking Problems)
Momentum
100
Calculate velocity. John drove 10m in 5 seconds.
2 m/s
100
Look at the following graph. When is Jesus' speed zero?
3-5 seconds
100
Calculate the force. m = 10 a = 2
F = 20N 10 * 2 = 20
100
What has the greater force when hitting a wall, assuming equal accelerations? A truck or a car?
A truck
100
What would have a greater momentum? A sumo wrestler or a little kid? Why?
The wrestler; it has a greater mass.
200
John drove from the movie theater to the park, 20 miles away. He did this in 4 minutes. Calculate velocity.
20/4 = 5 m/s
200
Look at the following graph. What is the displacement of Jesus?
His displacement is 0.
200
Calculate the mass. F = 200 a = 10
m = 20kg 200/10 = 20
200
Why would the truck have a greater force?
It has a greater mass. ( F = m*a)
200
What does conservation of momentum mean?
Momentum can't be created or destroyed.
300
Calculate acceleration. John drove at a speed of 15 m/s over a course of 3 seconds.
15/3 = 5 m/s2.
300
Look at the following graph. When is acceleration = 0?
Never.
300
Calculate the force. Velocity = 10 m/s mass = 50 kg time = 2 seconds
F = 250 N (10/2 = 5... 5*50 =250)
300
How could it be possible for a car to have a greater force than a large truck?
The car would have to have a much greater acceleration than the truck.
300
What are two ways momentum is saved or conserved?
1) It is transferred from one object to another. 2) There is an equal and opposite momentum in the other direction to create a balance.
400
Calculate acceleration. Elizabeth was riding her bike at a speed of 10 m/s. It started to rain, so she sped up to 20 m/s in 10 seconds.
20-10 = 10. 10/10 = 1m/s2.
400
Look at the following graph. When does Jerry slow down?
Never.
400
Calculate the Force. A 10kg bowling ball moves from at rest to 30 m/s. It's acceleration is 5 m/s.
F = 50N (10 *5)
400
When mass is doubled, how is Force affected?
It is doubled. Again, because of F=ma.
400
Why do guns produce a recoil?
Momentum is created by the bullet, so there must be a momentum in the opposite direction.
500
Calculate acceleration. Tony drove from his house to the club, which was 12 miles away. This took approximately 2 minutes.
12/2 = 6. 6/2 = 3m/s2
500
Look at the following two graphs. Is this the same car? Why or why not?
It IS the same car!
500
Calculate the Force. Jerry drives his car from the school to the restaurant, 200 yards away. He does this in 10 seconds before hitting a parked car. The mass of Jerry's car is 2000kg.
F = 4000 N 200/10 = 20 (velocity) 20 /10 = 2 (acceleration) 2 * 2000 = 4000
500
If m = x, and a = y... Provide an equation where F is doubled (2F) 2F = ?
2F = 2x*2y
500
Explain to me why there must be a law of conservation of momentum. In other words, why is it important that momentum is conserved?
Student answer.