Physics review 8th

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Match the corresponding graphs with the scenarios

• the Earth's orbit around the Sun, landing an airplane, launching a rocket

• landing an airplane, launching a rocket, the Earth's orbit around the Sun

• launching a rocket, landing an airplane, the Earth's orbit around the Sun

• the Earth's orbit around the Sun, launching a rocket, landing an airplane

Safety belts protect people in cars in the event of an accident because, according to Newton’s Laws of Motion, when an impact causes the car to suddenly change its motion, -

• the people in the car will continue to move in the same direction and at the same speed as before the impact.
• the speed of the car always increases, giving it greater force since the mass will remain the same.
• the speed of the people always increases, since now they have, not one, but two forces acting on them.
• the car now has a greater overall mass - its own mass plus the mass of the object by which it has been struck.

The forces acting an a toy car are shown.

In which direction will the race car move and with how much force?

• Right, 11 Newtons

• Left, 11 Newtons

• Right, 1 Newton

• Left, 1 Newton

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

• The car with the smaller mass will require less forces to stop than the car with the larger mass.
• The car with the larger mass will amintain its velocity while traveling down the hill.
• The car with the smaller mass will take longer to stop than the car with the larger mass.
• The car with the larger mass will have less inertia than the car with the smaller mass.

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Which of these accurately describes the motion of the toy train?

• The toy train speeds up while going forward and then slows down

• The toy train slows down while going forward and the moves backwards.

• The toy train moves forward at a constant speed , slows down, and then stops.

• The toy train moves forward at in increasing speed, stops, and then moves forward.

What is the average speed from 0-5 seconds?

• 1 m/s north

• 5 m/s

• 1 m/s

• 1 m/s^2