Question

1. fill in the blanks.

a. a force is a ____ or a ____ on an object.
b. in order to work to occur, a ____ must be applied to an object and the object must be displaced in the ____ direction as the force.

1. what are newtons three laws?
2. how much force is needed to accelerate a 66 kg skier at a rate of 2.00 m/s² west?
3. what is the acceleration of a 50.0 kg object pushed with a force of 500 n to the left?
4. a force of 250 n north is applied to an object that accelerates at a rate of 5.0 m/s². what is the mass of the object?

Explanation:

Step1: Use Newton's second law

Newton's second law is \(F = ma\), where \(F\) is force, \(m\) is mass, and \(a\) is acceleration.

Step2: Substitute values for question 3

Given \(m = 66\space kg\) and \(a=2.00\space m/s^{2}\), then \(F=ma = 66\times2.00=132\space N\)

Step3: Substitute values for question 4

Given \(F = 500\space N\) and \(m = 50.0\space kg\), then \(a=\frac{F}{m}=\frac{500}{50.0}=10.0\space m/s^{2}\)

Step4: Substitute values for question 5

Given \(F = 250\space N\) and \(a = 5.0\space m/s^{2}\), then \(m=\frac{F}{a}=\frac{250}{5.0}=50\space kg\)

Answer:

1.
a. push; pull
b. force; same
2.

• First Law: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
• Second Law: \(F = ma\) (Force equals mass times acceleration).
• Third Law: For every action, there is an equal and opposite reaction.

1. \(132\space N\)
2. \(10.0\space m/s^{2}\)
3. \(50\space kg\)