Calculations And FBDs

Suzie has a mass of 54 kg. What is the force of gravity acting on Suzie as she sits on the earth? Remember your units!

A race car with a mass of 700kg accelerates from rest at 10.0 m/s/s. The car has constant acceleration . What is the total unbalanced force acting on the car?

A 5000 kg helicopter accelerates upward at 2 m/s/s. Calculate the net force acting on the helicopter.

For the helicopter above, calculate the force due to gravity acting on the helicopter. Use 10 N/kg for the gravitational constant.

A truck with a total force of 4000 N accelerates at 2 m/s/s. What is the mass of the truck?

Calculate the net force acting on the box

• A.

  20 N

• B.

  - 45 N

• C.

  13 N

• D.

  -13 N

Which of the following is the best label for force A

• A.

  Force of tension on ball by rope

• B.

  Force elastic on ball by rope

• C.

  Force of tension on rope by ball

• D.

  Force applied on ball by rope

Select all of the forces acting on the magnet suspended by rope over an iron table.

• A.

  The gravitational force by the earth

• B.

  The normal force by the table

• C.

  The tension force by the rope

• D.

  The magnetic force by the magnet

• E.

  The magnetic force by the iron table

• F.

  The pulling force by the ceiling

Omar and Saya lean on each other.  Omar weighs 40kg and Saya weighs 60kg. Which one pushes harder on the other?

• A.

  It depends on if Omar or Saya move

• B.

  Omar and Saya push on each other equally

• C.

  Saya pushes harder, because she is heavier

• D.

  Omar pushes harder because he has more weight to hold up

A person pushes on a very heavy box. The box does not move. Which two arrows in the diagrams below are Newton’s 3rd law force pairs (equal and opposite) describing the interaction between the person and the box?

• A.

  Arrows 1 and 2

• B.

  Arrows 3 and 4

• C.

  Arrows 1 and 3

• D.

  Arrows 1 and 4