Friction
Gravity
Balanced and Unbalanced Forces
Newton's Laws of Motion
Mass and Weight
100
What is friction?
A force that acts between objects that touch each other; it works against pushes or pulls
100
What is gravity?
A force that pulls objects towards each other
100
What causes a ball to move through the air when it is thrown? What causes the ball to stop moving through the air?
The force applied by the person throwing the ball causes it to move through the air. Gravity causes the ball to fall back down to the ground.
100
How many laws of motion are there?
3
100
Which requires more force to move it, an object weighing 45 pounds or an object weighing 4.5 pounds?
An object weighing 45 pounds
200
Which object has more friction: carpet or concrete?
Carpet
200
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?
The ball that was pushed down a slanted surface will travel faster because of the force of gravity.
200
Two classes are playing tug of war on field day. The rope is not moving at all. This is an example of which type of force?
balanced force
200
What was the name of the scientist that gave us the laws of motion? (first and last name)
Isaac Newton
200
In order for someone to push a heavy box 10 meters across the floor, what type of force must be overcome?
The force of the person pushing the box must be greater than the force of friction.
300
When added to a smooth road surface, which would create the greatest amount of friction for a car? Ice, rain, or sand
Sand
300
Which object would gravity have a larger effect on, a 90 gram bar that is 10 feet long, or a 10 gram bar that is 90 feet long?
A 90 gram bar because it has more mass. Gravity has a stronger pull on objects with a larger mass. The size of the object does not have any affect on gravity.
300
Which type of force will cause an object to stay at rest?
balanced force
300
Newton's 3rd law states that for every action there is an equal and opposite reaction. Give an example of what this means.
Sample: If you push an object with enough force, it will move.
300
Ms. Brown is building a car to race down a ramp. It has a mass of 20 grams. What can she do to make the car go faster down the ramp? How do you know this will help?
Add more mass to the car. Gravity will have a stronger pull on a heavier object.
400
Explain the relationship between movement and friction.
As the rate of friction increases, the rate of movement decreases.
400
What must happen for an object to defy the force of gravity (even just for a couple seconds)
The force behind that object must be greater than the force of gravity.
400
Which type of force will cause an object to move?
unbalanced force
400
The greater the _________ of an object, the more _________ it will take to set it in motion.
The greater the MASS/WEIGHT of an object, the more FORCE it will take to set it in motion.
400

If a 9 pound bowling ball and a 1 pound baseball are both pushed down the same slope, which will reach the bottom first? Explain why.

The bowling ball will reach the bottom first because it is heavier and gravity will have a bigger effect on it.

500
Explain how motor oil keeps a car's engine from getting too hot.
The oil reduces the amount of friction between the parts in the engine.
500
An object has a mass of 60 grams. Would the weight of this object be more on a planet with a strong force of gravity or a weak force of gravity?
A strong force of gravity. Weight is the measure of the effect gravity has on an object's mass, so an object would have a higher weight if gravity was stronger.
500
If a 5th grade girl and a 1st grade boy both exert the same amount of force on an object and are pushing it in opposite directions, what will happen to the object?
The object will not move.
500

Newton's first law states that __________________ .

An object at rest will stay at rest unless acted upon by an outside force and an object in motion will stay in motion unless acted upon by an outside force.

500
What is the difference between mass and weight?
Mass is the amount of matter in an object, weight is the effect gravity has on the mass of an object
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