Forces and Motion

This force is a pull between all objects. It is the force that gives us weight here on Earth. And, if we throw a rock off of a cliff, it is the force that causes the rock to fall to Earth. What is this force?

• gravity

• friction

• magnetism

• air resistance

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To investigate the effects of balanced and unbalanced forces, Jose and Gina test various objects and record the results. For this investigation, they stand on opposite sides of a large 10-pound wooden box and push against it toward one another. Jose pushes with 20 pounds of force and Gina pushes with 15 pounds of force. Which BEST describes what will happen?

• The box will move toward Gina.

• The box will move toward Jose.

• The box will not move.

• The box will lift off the ground.

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The kicker has made contact with the football. In order for the ball to follow the path shown by the dotted line, what must be true of the forces acting on the ball?

• Force 1 must be the greatest.

• Force 2 must be the greatest.

• Force 3 must be the greatest.

• Force 4 must be the greatest.

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Sam is pushing a cart. How can he make the cart move faster?

• He can add weight to the cart.

• He can push the cart up a ramp.

• He can take the wheels off the cart.

• He can increase the force of his push.

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The box in the picture begins motionless, and then both forces are applied at the same time. Describe the resulting motion of the box

• The box will not move.

• The box will move to the left.

• The box will move to the right.

• The box will move to the left and then the right.

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Julio hit a baseball. What caused the ball to change direction at the time of impact?

• the force of gravity

• the speed of the ball

• the force of his swing

• the weight of the air

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Imagine there are four hammers to throw: 16, 12, 10, and 8 pounds. If you throw each hammer with the same amount of force, which hammer will move the shortest distance?

• 8 pounds

• 10 pounds

• 12 pounds

• 16 pounds

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Which student threw the ball with the greatest force?

• connor

• jake

• leroy

• pete

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Francis and Pedro are riding bicycles side by side. Pedro passes Francis. What caused Pedro’s bicycle to go faster?

• The wind started blowing.

• Pedro pushed harder on the pedals.

• Pedro and Francis were going downhill.

• Pedro’s bicycle weighed less than the Francis’s bicycle.

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A submarine is moving forward slowly in the water. When it increases thrust, it will

• go faster.

• slow down.

• save fuel.

• overcome gravity

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