Question

1. force is measured in newtons
2. f = ma means:

a. force equals momentum times acceleration
b. force equals mass times action
c. force equals mass times acceleration
d. force equals momentum times action

1. to make a soccer ball move faster, you need to increase

a. its mass.
b. its friction.
c. its gravity.
d. the force applied to the ball

1. a 20 kg wagon accelerates at 4m/s², what is the force?

a. 20 n b. 40 n
c. 60 n d. 80 n

Explanation:

Step1: Recall Newton's second - law formula

The formula for Newton's second law is $F = ma$, where $F$ is force, $m$ is mass and $a$ is acceleration.

Step2: Answer question 1

Force is measured in Newtons. So the answer to question 1 is Newton.

Step3: Answer question 2

According to Newton's second - law, $F=ma$, which means Force equals mass times acceleration. So the answer to question 2 is c.

Step4: Answer question 3

Based on $F = ma$, to increase the acceleration (make the ball move faster) of an object (soccer ball), given its mass is constant, we need to increase the force applied to it. So the answer to question 3 is d.

Step5: Answer question 4

Given $m = 20$ kg and $a=4$ m/s², using $F = ma$, we substitute the values: $F=20\times4 = 80$ N. So the answer to question 4 is d.

Answer:

1. Newton
2. c. Force equals mass times acceleration
3. d. the force applied to the ball
4. d. 80 N