Complex Forces Review

When something is at static equilibrium, the net force in the X AND Y direction is....

• Positive

• Negative

• Zero

• It depends on the problem!

What does a scale ACTUALLY measure?

• Force of gravity

• Normal Force

• Acceleration

• Mass

A man pushes down on a 40 N desk with 12 N of force. What is the magnitude of the normal force?

• 52 N

• 28 N

• 480 N

• 50 N

You have a 12 N tension cable that is at a 35 degree angle with the horizontal. The x component would be...

• 35cos(12 degrees)

• 12cos(35 degrees)

• 12 N

• 12sin(35 degrees)

You have a 20 N tension cable that is at a 10 degree angle above the horizontal. The y component would be...

• 20cos(10 degrees)

• 10cos(20 degrees)

• 10sin(20 degrees)

• 20sin(10 degrees)

A block of weight 100.0 N is suspended by two wires. T1 is the wire at a diagonal, and T2 is going directly toward the left. What is the tension in the wire going at a diagonal, T1?

• 115.5 N

• 100. N

• 57.74 N

• 68.89 N

A man is mowing a lawn and applying a force of 15.0 N at 40.0 degrees BELOW the horizontal to a 30.0 kg lawnmower. What is the normal force? Neglect friction.

• 304 N

• 9.64 N

• 294 N

• 312 N

You are on an elevator accelerating downwards. Would you feel lighter or heavier?

• Lighter

• Heavier

• Same as weight!

You, an 80.0 kg human, are on an elevator accelerating upwards at a rate of 2.00 m/s2. What would be the value of the normal force?

• 852 N

• 160. N

• -784 N

• 944 N

You, an 80 kg human, are on an elevator, and the elevator cable suddenly snaps! What would your apparent weight be on a scale?

• 0 N

• 784 N

• 700 N

• 80 N