Forces and Motion Quiz

Beyonce must clear a flipped car. She pushes the car with different amounts of force which causes the car’s acceleration to be different.

The results are:

Force of 20N: Acceleration of 5m/s²

Force of 54N: Acceleration of 13.5m/s²

Force of 100N: Acceleration of 25m/s²

What is the MASS of the car? Show your work with UNITS!

• 2 cm

• 4 kg

• 5 N

• 10 m/s

Answer explanation

They are all the same car.

M = F / A

So, divide any of the forces by the resulting acceleration.

M = 20 N / 5 m/s^2 = 4 kg

**remember a unit for mass is kg!!!

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Batman and Superman are pushing a train in opposite directions. Batman is pushing with a force of 120N, and Superman is pushing in the opposite direction with a force of 80N.

What is the net force? And which way does the train move?

Answer explanation

The net force is the total force acting on train. Superman's 80 N cancel out some of the force from Batman.

120 N - 80 N = 40 N <- net force on train

Because Batman is pushing away with more force, the train will move towards Superman.

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A car is pushed with a force of 70N, it accelerates at 40 m/s².

What is the mass of the car? Show your work with UNITS!

• 1.75 kg

• 2.9 cm

• 2.5 m/s

• 3 N

Answer explanation

M = F / A

M = 70 N / 40 m/s^2

M = 1.75 kg

(the unit for mass is kg!)

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A 900 kg train accelerates from a speed of 70 m/s to 160 m/s in 2 minutes.

Calculate force. Show your work with UNITS!

• 67.5 N

• 675 N

• 6750 m/s

• 6750 kg

Answer explanation

First find the acceleration by dividing the difference in velocity by the time in seconds. Then use the acceleration in the F=MA equation.

A = 160 m/s - 70 m/s =>
120 SECONDS

A = 90/120 = 0.75 m/s^2

F = M * A ....

F = 900 Kg x 0.75 m/s^2 = 675 N

...remember the unit for force is N!! (newtons)

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Which of the following is a unit of force?

• Kilogram

• Meter per second squared

• Newton

• Joule

Answer explanation

Newtons (N) are a unit of FORCE.

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Which of the following is a unit for MASS?

• Kg

• N

• cm

• mL

Answer explanation

KiloGrams are a unit of MASS.

two equal and opposite forces of 6.0 N act on an object. The unbalanced force on the object

• is 0 N

• is 6.0 N

• is 8 N

• is 12 N

Answer explanation

if the forces are equal, the net force is 0 N

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A 15kg object is subjected to a force that causes it to accelerate at 3 m/s². What is the magnitude of the force?

• 30 N

• 45 N

• 60 N

• 75 N

Answer explanation

F = M * A

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A 10kg object is subjected to a force that causes it to accelerate at 6 m/s². What is the magnitude of the force?

• 30 N

• 40 N

• 50 N

• 60 N

Answer explanation

F = M * A

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A 25kg object is pushed with a force of 100N.

What is the acceleration of the object?

• 2 m/s²

• 3 m/s²

• 4 m/s²

• 5 m/s²

Answer explanation

A = F / M

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