Newton’s Second Law problems

1.  What unbalanced force is required to accelerate a 1500 kg race car at 3.00 m/s/s?

2.  When a shot putter exerts a net force of 140 N on a shot, the shot has an acceleration of 19 m/s/s. What is the mass of the shot.

3.  A 7.3 kg bowling ball sliding down a smooth ramp has a net force of 20 N exerted on it. What is its acceleration?

4.  Together a motorbike and rider have a mass of 275 kg. The rider slows the motorbike at –4.5 m/s/s. What is the net force on the motorbike? What does the negative sign signify?

5.  A towrope is used to pull a 1750kg car, giving it an acceleration of 1.35 m/s/s. What force does the rope exert?

6.  A race car has a mass of 710 kg. It starts from rest and travels 40m in 3.0s. The car is uniformly accelerated during the entire time. What net force is applied to it?

7.  What is the net force acting on the following objects? If each of the objects below have a mass of 2.0kg, what are their accelerations?

5N 12 N 10N 15N

450

10N

10N

5N

More Net Force

  1. A person is pushing on a shopping cart with a force of 10 N at an angle of 35° with the horizontal. Find the x and y components (i.e. Fx and Fy) of this force.
  1. A person is pushing a lawn mower with a force of 25 N at an angle of 15° with the horizontal. Find the x and y components (i.e. Fx and Fy) of this force.
  1. Find the net force acting on the object.

Fnetx =

Fnety =

Find the magnitude of the net force using the Pythagorean Theorem

Find the direction (angle) in which the net force acts. (use tangent)

If the mass above is 5.0kg, what will its acceleration be? (use Newton’s 2nd)