Chapter 6: Forces

What is Newton's 2nd Law

• object at rest remains at rest unless acted upon by unbalanced force

• F=ma

• object in motion remains in motion unless acted upon by unbalanced force

• W=mg

The figure shows the velocity graph of a 2.0kg object as it moves along the x-axis. What is the net force acting on this object at t=1s?

• 0 N

• 2 N

• 4 N

• 6 N

The figure shows the velocity graph of a 2.0kg object as it moves along the x-axis. What is the net force acting on this object at t=7s?

• 0 N

• 2 N

• 4 N

• 6 N

The three ropes are tied to a small, very light ring. Two of the ropes are anchored to walls at right angles, and the third rope pulls as shown. What is T1 (rope 1)?

• 100cot(30)

• 100cos(30)

• 100sin(30)

• 100tan(30)

The three ropes are tied to a small, very light ring. Two of the ropes are anchored to walls at right angles, and the third rope pulls as shown. What is T2 (rope 2)?

• 100cot(30)

• 100cos(30)

• 100sin(30)

• 100tan(30)

The figure shows the force acting on a 2.0kg object as it moves along the x-axis. The object is at rest at the origin at t=0s. What is the acceleration at t=6s?

• 0 m/s²

• 2 m/s²

• 5 m/s²

• 7 m/s²

The figure shows the force acting on a 2.0kg object as it moves along the x-axis. The object is at rest at the origin at t=0s. What is the velocity at t=2s?

• 0 m/s

• 2 m/s

• 4 m/s

• 6 m/s