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Force & Motion Review
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Which of Newton's Laws explains the motion of a swimmer paddling their arms one way but moving through the water in the other direction?
3rd Law
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A change in velocity over a specific amount of time is the ___________.
acceleration
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What is your average speed if you take 0.5 h to jog 4,000 m?
8000 m/h
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What is the speed of the object at 8 seconds?
10 m/s
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Runner A ran 12 miles in 4 hours and Runner B ran 9 miles in 3 hours. Which runner had the greatest average speed?
The both have the same average speed
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Which of Newton's Laws explains someone needing to wear a seatbelt in a car?
1st Law
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True or false? A moving object can have balanced forces?
True. (If the object is moving at a constant speed)
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Calculate the net force and indicate the direction of the movement.
54N right ---->
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Acceleration is measured in _______. (units)
distance/time^2
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A book sitting on a shelf is an example of which of Newton's Laws?
1st Law
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A runner moves at 3 m/s. This is his _______.
speed
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Calculate the net force and indicate the direction of the movement.
20N right ---->
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What was the average speed of the toy car during the two trials to the nearest tenth of a m/s? Be sure to use the correct place value.
1.5 m/s
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Newton's 3rd laws states that..
Every action has an equal and opposite reaction
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55 m/s is an example of ________.
speed
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To find the net force of two objects moving in the opposite direction, you would ______ the two forces.
subtract
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During which part(s) of the marble's fall does it experience unbalanced forces?
Part A and B because it is changing speed
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Force is measured in __________. (units)
Newtons
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A walker walks home from school at 1.5 m/s west. This is her ________.
velocity
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A change in distance over a specific amount of time plus the direction is the ___________.
velocity
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Newton's 1st Law states that...
An object in motion stays in motion, and an object at rest stays at rest unless acted upon by an unbalanced (external) force
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A student pushes a cart with a 25 kg mass. How much force does she use if the cart accelerates at 2.5 m/s/s?
62.5 N
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Newton's 2nd Law is
Force = mass x acceleration or the more mass and object has the more force is required to make it accelerate
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A change in distance over a specific amount of time is the ___________.
speed
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5 m/s west is an example of ______.
velocity
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To find the net force of two objects moving in the same direction, you would ______ the two forces.
add
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A 2000 N force acts on a 40kg object. What is the acceleration?
50 m/s/s
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Speed and velocity and measured in ________? (unit of measurement)
distance/time
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A runner travels 15 km in two hours. What is his speed?
7.5 km/hr
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