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A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
Gravity pulls things which way on the Earth?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
A pencil falls off of a desk. What moves the pencil toward the floor?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
Sam is building a car to race down a ramp. The car weighs 100 grams. Which could Sam do to increase the speed of the car?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
Which is the best example of a pushing force that reduces the speed of an object?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
Two identical balls are pushed with the same force. One ball is pushed along a flat surface and the other ball is pushed down a slanted surface. Which ball will travel faster and why?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion?
friction
down
the ball on the slanted surface, because of increased gravity
decrease the mass of the car
ball with a mass of 20 kg
gravity
The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
a brake rubbing against a wheel
Check it!