1:By what factor does the centripetal acceleration change if a car goes around a

Question

1:By what factor does the centripetal acceleration change if a car goes around a corner three times as fast?

Select one:

a. It stays the same.

b. 0.5

c. 2

d. 9

e. 4

2:A 5 kg ball is thrown horizontally at a speed of 20 m/s. At the same time a 100 kg ball is dropped from the same height. Ignoring air resistance, which ball hits the ground first?

Select one:

a. the 5 kg ball

b. the 100 kg ball

c. Hard to tell

d. It is a tie

e. none of above

3:In two dimensional motion, what is the SAME factor in both directions?

Select one:

a. velocity

b. acceleration

c. displacement

d. time

e. none of above

4:If there is no net force acting on an object, its motion will be one with ______ acceleration.

Select one:

a. a constant, non zero

b. an increasing

c. a decreasing

d. zero

e. none of above

5:What is the net force on a 2000 kg car that is traveling in a straight line at a constant speed of 40 m/s?

Select one:

a. 2000 N

b. 20000 N

c. zero

d. 40x2000

e. none of above

6:If the force of friction on a child's wagon is 25 N, how much force must be applied to maintain a constant, non-zero velocity?

Select one:

a. 25 N

b. 50 N

c. zero

d. 26 N

e. 24 N

7:There are three forces acting on an object: 6 N to the left, 5 N to the right, and 3 N to the right. What is the net force acting on the object?

Select one:

a. 2N left

b. 2N right

c. zero

d. hard to tell

e. none of above

Explanation / Answer

(1) centripetal acceleration is a = v2/r

it depends on square of v

so if v becomes three times then acceleration will become 9 times

option d is correct

(2) As initial vertical velocity is zero for both

and both experience same exceleration a =g = 9.8 m/s2 in downward direction

so both will reach at the same time

option d is correct

(3) (d) Time

(4) (d) Zero

(5) As it is moving with constant speed so net force is zero

option c is correct

(6) Same force we need to apply

(a) 25 N

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