Unit 6 Forces Test Flashcards
1
Q
- An object that is falling freely has a constant what?
A
C. Acceleration
Unit 6 concept 3 pg. 22
2
Q
- In the picture to the right, if the card were quickly pulled of the cup like the arrow suggest, what property would explain why the coin falls into the cup rather than moving with the card.
A
C. Inertia
Unit 6 concept 3, pg. 20
3
Q
- Why does someone not wearing a seatbelt in a car fly forward when the car stops suddenly? Make sure to include which law explains this.
A
Because an object in motion will resist a change in motion because of inertia. Newton’s 1st law.
Unit 6 concept 3, pg. 20
4
Q
- C. Why does this occur?
A
Air resistance and gravity become balanced, and a falling human will fall at a constant velocity.
Unit 6 concept 3 pg. 22
5
Q
- A man and his bike are 95 kg. His instantaneous speed at one point is 14 m/s. The next time his speed is checked he is going 28 m/s. If the second speed was taken 7 seconds later, what force must the man have given his bike to change the speed? What was the bicyclist final momentum?
A
Pf= mvf
Pf=95x28
Answer: Pf= 2,660 kg*m/s
6
Q
- In a collision a 25 kg ball moving at 3 m/s transfers al, of its momentum to a 5 kg ball. What is the velocity of the 5 kg ball after the collision.
A
V = 15 m/s forward
