Forces & Motion EOY Review

If the same amount of force were applied to all four balls in the picture, which would experience the greatest change in motion?

• 5 kg

• 10 kg

• 20 kg

• 40 kg

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

A 600g basketball, a 500g football, a 150g baseball, and a 50g yo-yo: four toys. If you had to throw one of the four, which one would take the MOST force to throw?

• 600 g basketball

• 500 g football

• 150 g baseball

• 50 g yo-yo

Tags

NGSS.MS-PS2-2

In canoeing, you paddle backward to go forward. Canoeing can be explain by Newton's third law that says

• The water transfers energy to the boat to make it move.

• Once the boat is moving forward, it will naturally continue to move forward.

• As the paddle push the water backward, the water pusher the paddler forward with an equal force.

• The body of water has a larger mass and will exert a larger force on the paddle then the paddle does on the water.

Viscosity is the resistance of a fluid to flow. Both liquids and gases are considered fluids. A viscous fluid has a high viscosity. That is, it does not flow easily. A less viscous fluid flows more easily. Liquids like molasses and motor oil are very viscous. Students conducted an experiment calculating the viscosity of three liquids: syrup, oil and water. They timed how long it took a bubble of air to travel through each tube of liquid. They calculated the speed of the bubbles. After 5 trials, they calculated the average speeds. According to the student data collected in the experiment, the speed of the bubble should be reported using what unit(s) of measure?

• cm

• cm/s

• m/s

• m/s²

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A boy of mass 60 kg stands on a boat of mass 250 kg. This system is stationary. From the boat, the boy throws a rock of mass 1 kg into the water with a velocity of 10 m/s. What is the magnitude and direction of the boat's motion as a result of this?

• The boat moves in the direction of the rock with a velocity of 31 m/s.

• The boat moves in the direction of the rock with a velocity of 0.02 m/s.

• The boat moves in a direction opposite to the rock with a velocity of 0.03 m/s

• The boat moves in a direction opposite to the rock with a velocity of 10.1 m/s.

Tags

NGSS.MS-PS2-1

What is the average time of the collected student data?

• 48s

• 50s

• 52s

• 55s

This graph shows that as an object’s mass increases its

• inertia increases.

• inertia decreases.

• acceleration increases.

• acceleration decreases.

Which statement BEST explains why the person and the raft moved in opposite directions?

• second law of motion

• action and reaction forces

• person wanted the raft to move

• force is the product of mass and acceleration

Tags

NGSS.MS-PS2-1

Consider a person sliding down a water slide at constant velocity. What are the forces acting on the person as they slide? Are the forces balanced or unbalanced? Explain.

• Gravity and friction are acting on the person. The forces are unbalanced because the person is sliding down the slide.

• Gravity and air resistance are acting on the person. The forces are balanced until the person reaches the bottom of the water slide.

• Weight, gravity, and friction are acting on the person. The forces are unbalanced. Gravity is the strongest force causing the person to move.

• Gravity and friction are acting on the person. The forces are balanced. There is no net force because the person is moving at a constant velocity.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Why does an object in motion stay in motion unless acted on by an unbalanced force?

• because forces are what stop and start motion

• because balanced forces cannot exist in nature

• because motion is the inherent state of all matter

• because motion, once begun, continues to accelerate