Question

an object is moving at a constant speed in a straight line. according to newtons first law of motion, what can be said about the forces acting on the object?
a) there is a net force acting on the object.
b) the forces acting on the object are unbalanced.
c) the net force acting on the object is zero.
d) the object is accelerating.

olivias ship has a mass of 15,000 kg. if her thrusters produce a force of 750 n, what will be her ships acceleration?
a) 0.005 m/s
b) 0.05 m/s
c) 0.5 m/s
d) 112,500,000 m/s

Explanation:

First Question (Multiple Choice)

Newton's First Law states that an object at rest or in uniform motion (constant speed in a straight line) has a net force of zero (balanced forces, no acceleration). Option a is wrong (net force isn't present). Option b is wrong (forces are balanced). Option d is wrong (no acceleration). So option c is correct.

Step1: Recall Newton's Second Law

Newton's Second Law is \( F = ma \), so \( a=\frac{F}{m} \).

Step2: Substitute values

Given \( F = 750\,\text{N} \), \( m = 15000\,\text{kg} \). Then \( a=\frac{750}{15000} \).

Step3: Simplify the fraction

\( \frac{750}{15000}=\frac{1}{20}=0.05\,\text{m/s}^2 \).

Answer:

c) The net force acting on the object is zero.

Second Question (Calculation)