Physics Forces Quiz 5

An object that experiences a net force of 80 Newtons speeds up from 10 m/s to 20 m/s over a period of 5 seconds. What is the mass of the object?

• 8 kg

• 40 kg

• 160 kg

• 800 kg

• 1600 kg

Tags

NGSS.MS-PS2-2

What will happen to an object if a force that opposes its motion is greater than the force pushing or pulling it forward?

• The object will move slower and slower the entire time.

• The object will move at constant speed for a while and then slow down.

• The object will slow down for a while and then move at constant speed.

• The object will move at constant speed the entire time.

Tags

NGSS.MS-PS2-2

Which of the following statements is TRUE if a moving object is slowing down?

• A force within the object must be decreasing.

• A force that is pulling or pushing the object forward must be decreasing.

• A force that is causing the object to slow down must be greater than the sum of the forces that are pulling or pushing the object forward.

• A force that is causing the object to slow down must be increasing.

Tags

NGSS.MS-PS2-2

An empty cart is put into a launcher and pushed with a force F. Then, the same cart is launched with a force 2F (or twice as big). What is the difference in the motion of the cart?

• It depends on the friction of the turning wheels of the cart.

• Both pushes produce the same motion; the size of the push does not matter.

• The bigger push produces a greater change in the cart's speed.

• There is no difference because the bigger push produces greater friction.

Tags

NGSS.MS-PS2-2

When Billy gets home from school he begins to push objects around on his air hockey table. He wants to know what affects the change in speed of the objects on the frictionless surface. Choose the statement below that is the most accurate.

• You can make an object go faster if you push it harder for the same amount of time.

• Since the air hockey table is frictionless, when you push objects with the same force for the same amount of time, they will move with the same speed.

• If you push an object harder it will go faster, regardless of the length of time that you push it.

Tags

NGSS.MS-PS2-2

How much net force does it take to make a 20 kg object accelerate at a rate of 5 m/s/s?

• 0.25 N

• 4 N

• 25 N

• 40 N

• 100 N

Tags

NGSS.MS-PS2-2

A school bus is slowing down as it comes to a stop sign. Which of the following statements is TRUE about the forces acting on the school bus while it is slowing down but still moving forward?

• As long as the school bus is still moving forward, the forward force of the school bus has not run out.

• As long as the school bus is still moving forward, any forces moving it forward would have to be larger than any forces slowing it down.

• If the school bus is slowing down, any forces moving it forward would have to be smaller than any forces slowing it down.

• If the school bus is slowing down, any forces moving it forward would have to be the same size as any forces slowing it down.

Tags

NGSS.MS-PS2-2

Mildred drops the 3-kg steel puck and the 1-kg aluminum puck at the same time from the same height. she observes that the pucks land at the same time. How does the force on the steel puck compare to the force on the aluminum puck?

• The force on the steel puck must be 3 times bigger since the steel puck had three times the mass.

• The force on the aluminum puck must be 3 times bigger since the steel puck had three times the mass.

• The force is the same on both pucks since gravity made the two pucks fall at the same rate.

• We cannot determine the forces without knowing the actual values for mass and acceleration.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The following Velocity vs. Time graph represents the motion of an object. When does the object have a net force acting in the opposite direction of the motion?

• From A to B

• From A to C

• From B to C

• Never; the speed is constant

• Never; the acceleration is constant

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

The Position vs. Time graph represents the motion of an object. When does the object have a net force acting in the same direction as the motion?

• From A to B

• From B to C

• From C to D

• From D to E

• From A to B and C to D

Tags

NGSS.MS-PS2-2