Question

forces & motion test #1
1.) use the table below to answer the question:

marble	length of ramp (centimeters)
marble 2	30 cm

nathan drops marbles down two ramps that have different lengths. it takes the seconds to reach the bottom of both ramps. which statement is true?
a) marble 1 has a faster speed than marble 2
b) both the marbles travel at the same speed.
c) marble 2 has a faster speed than marble 1.
d) there is not enough data to compare the speeds of marbles.
2.) the tendency to resist a change in an object’s motion is
a) dancing
c) a rocking chair
b) newton’s apple
d) inertia
3.) read and answer below:
have you ever slipped on ice? there was not enough friction, thus you fell. have you ever tried flat tire? there was too much friction, therefore you could not move forward. smooth surfaces produce more friction.
all of the following below are examples of more friction:
snowboarding on concrete
snowboarding on a snowy mountain.

Explanation:

Step1: Recall speed formula

Speed = Distance/Time.

Step2: Analyze given data

Marble 1 travels 20 cm and Marble 2 travels 30 cm in the same time.

Step3: Compare speeds

Since time is the same and distance of Marble 2 is greater, by the speed - distance - time relationship, Marble 2 has a faster speed.

For question 2, inertia is the tendency to resist a change in an object's motion.

Answer:

1. C. Marble 2 has a faster speed than Marble 1.
2. D. Inertia