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Worksheet: Forces and Newton's Second Law of Motion

Q1:

Your -kg sports car accelerates from 0 to 30 m/s in 10 s. What average force is exerted on it during this acceleration?

  • A N
  • B N
  • C N
  • D N
  • E N

Q2:

A car with a mass of kg applies brakes when it is moving at 90.0 km/h, and the car comes to rest after travelling 40.0 m. What is the net force on the car during its deceleration?

Q3:

Find the magnitude of the net force required to bring a car to rest if the mass of the car is kg, its initial speed is 40.0 km/h, and its stopping distance is 25.0 m.

Q4:

A baseball catcher is performing a stunt for a television commercial. He will catch a baseball (mass 145 g) dropped from a height of 60.0 m above his glove. His glove stops the ball in 0.0100 s. What is the force exerted by his glove on the ball?

Q5:

A baby dolphin of mass 35.0 kg decelerates from a horizontal speed of 12.0 m/s to a horizontal speed of 7.50 m/s, taking 2.30 s. What average force is exerted to slow the dolphin?

Q6:

The rocket sled shown in the accompanying diagram has a mass of kg. The sled decelerates at a rate of 196 m/s2. What force is necessary to produce this deceleration? Assume that the rockets have finished firing when the deceleration begins.

Q7:

A particle of mass 2.0 kg is acted on by a single force .

What is the particle’s acceleration?

  • A
  • B
  • C
  • D
  • E

If the particle starts at rest, how far does it travel in the first 5.0 s?

Q8:

A cleaner pushes a laundry cart of mass 6.30 kg. The cleaner pushes with a net external force of 53.4 N. Calculate the magnitude of the cart’s acceleration.

Q9:

A cart with a mass of 18 kg is at rest on a level floor. A constant 15-N force is applied to the cart at an angle below the horizontal. If friction is negligible, what is the speed of the cart when the force is applied over a distance 6.7 m?