Test - Unit 4 Forces

Question 1

1. A baseball player swings his bat and misses the ball but hits a fly that was hovering over the home plate. The acceleration of he fly compared to the acceleration of the ball would have been with the same force applied to it would be..

Answer 1

larger

Concept 3 pg. 20

Question 2

8. Consider a watermelon that starts from rest and is dropped straight down from a tall building. Air resistance can be ignored. Which statement about the watermelon’s motion is false?

Answer 2

The watermelon falls with a constant velocity.

Concept 3 pg. 22

Question 3

13. An object hat is falling freely has a constant what?

Answer 3

acceleration

Concept 3 pg. 22

Question 4

14. A student drops a feather and a rock at the same time. If air resistance wasn’t a factor, what should we observe?

Answer 4

The rock and the feather fall at the same rate.

Concept 3 of. 20

Question 5

15. In the picture to the right, if the card were pulled off the cup like the arrow suggests, what property would explain why the coin falls into the cup rather than moving with the card?

Answer 5

Inertia

Concept 3 pg. 20

Question 6

43. A man and his bike are 95 kg. His instantaneous speed at one point is 14 m/s. A the next time his speed is checked he is going 28 m/s. If the second speed was taken at 7 seconds later, what force must the man have given his bike to change the speed? What was his final momentum?

Answer 6

velocity doesn’t equal acceleration in p=mv

2,660 kg*m/s