force and motion/ energy review

A book sitting on a desk has....

• Balanced forces acting on it

• Unbalanced forces acting on it

• No forces acting on it

• All forces acting on it

If a ball and a piece of paper are dropped from the same height they will

• Hit the ground at the same time because of gravity

• Hit the ground at different times because of gravity

• Hit the ground at different times because of friction

• Hit the ground at different times because of air resistance

What can make an object start moving, stop moving or change direction?

• Gravity

• Work

• Force

• Inertia

4 balls are thrown with the same amount of force. Which ball will go further?

• 100kg

• 250kg

• 500kg

• 750kg

The ________ the mass of the object, the _______ the force required to move or stop the object.

• Greater; Greater

• Smaller; Greater

• Greater; Smaller

• Smaller; Smaller

A football player kicks a ball into the air. It falls to the ground, rolls then stops. What two forces cause the ball to stop?

• Gravity and Friction

• Force and Friction

• Force and Motion

• Force and Gravity

Newton's first law of motion states:

• A force acting on an object will change the object's velocity by causing it to speed up, slow down, or change directions.

• A body in motion tends to remain in motion, a body at rest tend to remain at rest unless acted on by an outside force.

• For every force and action, there is an equal and opposite reaction.

Newton's second law of motion states:

• A body in motion tends to remain in motion, a body at rest tend to remain at rest unless acted on by an outside force.

• For every force and action, there is an equal and opposite reaction.

• A force acting on an object will change the object's velocity by causing it to speed up, slow down, or change directions.

Newton's third law of motion states:

• For every force and action, there is an equal and opposite reaction.

• A body in motion tends to remain in motion, a body at rest tend to remain at rest unless acted on by an outside force.

• A force acting on an object will change the object's velocity by causing it to speed up, slow down, or change directions.

What would most likely happen to the motion of the box if you poured oil on the ramp?

• It will slow the box because the force of friction will be increased.

• It will speed up the box because the force of friction will be increased.

• It will slow the box because the force of friction will be reduced.

• It will speed up the box because the force of friction will be reduced.